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Thread: Bang my head: call to all experts, Corolla

  1. #1
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    Default Bang my head: call to all experts, Corolla

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    Guys, I want to bang my head with Wall. Have you ever lost your keys, what do you do, find it everywhere, look at it again and again at same place or nearby. Same is the issue with me ????

    9th generation corolla Xli, 2007 model, 135000 km on clock, with engine 2nz-fe 1nz-fe is neither vvt or vvt-i is a plain engine without O2 sensor but has variable resistor so I have no help from internet except www.toyodiy.com website which gives exact engine details, components attached along with part numbers once you insert frame no of your car on site.


    (
    03/2007 TOYOTA COROLLA (NZE120R-GEMDKP) )

    OBD test on this vehicle does not provides information related to Long Term Fuel Trim LTFT and Short term fuel trim STFT cross checked on my OBD device and that?s from Toyata Rawal Motors, Toyata GT motors so how do I determine the air to fuel mixture of this EFI car as they say that computer they have from company does not shows LTFT,STFT on this vehicle.


    PROBLEM TAG:


    Car starts well on cold start up on petrol, but stalls if we press accelerator in morning while engine is cold while on petrol. Anyway once switched to CNG then flies but after 5 minutes once temperature has reached its optimum temperature then car runs well even on petrol.


    PROBLEM TAG:

    Vehicle stumbles on cold startup if accelerated but no problem while idling.

    PROBLEM TAG:

    Car stalls on petrol once accelerated from cold startup but becomes ok once attained proper operating temperature.

    Problem is a year old problem, guess what I have tried and done numbers of times

    Fuel Pump:
    Changed with denso original

    Fuel Filter:
    Changed twice with Toyata genuine fuel filter twice in last 15000km.

    Fuel Pressure Regulator:
    changed twice in last 15000 km.

    Fuel Pressure Test:
    Nobody had fuel gauge so had to buy my own. Fuel pressure is 42PSI once clicked and does not drops below 36psi even after 5 minutes. Mechanic says that let is try to install kabli and let?s see and I am sick and tired of everyone guessing, spending my money and still no results.

    Injectors ultrasonic cleaning:
    done from Nazir autos some 7000km back, injectors were fine but were cleaned again. Since then I regulator disconnect the injectors and keep on cleaning with carburetor cleaner at times and again expecting a magic to take place. I have disconnected individual injectors several time once car is idling and it stalls indicating that fuel injectors are firing properly.

    Ignition Coils:
    although, car runs perfectly well on CNG but ignition coils were disconnected while car was idling. It stalled and showed all of them to be ok both on petrol and CNG.

    Spark Plugs:
    sick and tired of changing them, adjusting the clearance and cleaning it after every 500km. this has became a joke.

    Tappet settings and valve clearance:
    Checked before twice and again checked today. Verified to be ok and within specs.

    Trouble Codes:
    car does not gives any trouble code.

    Throttle body wash:
    throttle body cleaned, idle control valve adjusted and it seems to work fine as once its position is changed then either idle rpm increase or decreases. Throttle position sensor works ok as obd test reveals that it is changing its position once we hit accelerator.

    MAF sensor:
    it gives flow of air and also provides intake air temperature. I have bought a second hand from scrap yard, switched its position but data on both the sensors matches 100%. Toyata motors have also tried to install a new one as a smart mechanic highlighted a problem with his blind fate, changed it but problem was intact so he took it back declaring the original to be ok.

    Intake Manifold:
    recently, I started suspecting that intake manifold maybe blocked but once it was removed then it seemed clear, slightly dirty but nothing such that can block the air passage. Cleaned and was installed back but problem is intact.

    Coolant Temperature Sensor:
    suspecting that it may be a problem so I looked at its reading on EML327 once car is started. It starts from 20 C and goes all the way to 92 C and now that I look at it every time once car starts. Although, I can change this but will I keep on spending money as results looks ok.

    Intake Temperature Sensor:
    this reading varies from 55 F to 70 F depending upon the temperature and sensor comes within the MAF sensor. It has been replaced with other MAF sensor I have but OBD shows same consistent readings on both the sensors so have attached it back.

    Air Filter and Housing blockage:
    it has no blockage like people do it on CNG cars. Clear air passage, no obstructing in between. Seems fine to me , as I take it off and put it back every time. Clean it as well.

    PCV valve:
    You know this is for Engine ventilation, removed and cleaned, seems ok as air passes one way and installed back. No improvement.

    Knock Sensor:
    Today, I got it opened, although did not had any trouble code from ECU. It seemed perfectly clean from inside so got it installed again without disturbing anything.

    Variable Resistor:
    this controls the air to fuel mixture, increases supply of petrol and has a specific procedure for increasing or decreasing the petrol. But you know what, I visited toyata GT motors, Toyata motors as they did not had the specific equipment to test and adjust it. So blindly said that problem is not with this part. Manual says that it not be disturbed or adjusted without measuring the CO2 content from exhaust.

    Fuel Tank inspection:
    fuel tank opened, checked and seems ok and crystal clear.

    Engine Condition: throws water droplets out on cold startup in morning from exhaust, mechanic says that its a sign that engine is in good condition, oil changes after every 5k, diary maintained, no signs of sludge so far. rocks on cng.

    I don?t know, I have got nut, Every mechanic wants to repeat older steps, once satisfied that they are ok, then says ?I don?t know?. Even toyata mechanic says ? temporarily tries to satisfy me, charges and next day problem is back. Don?t have so much time that I keep running around a shitty reason, they keep charging me and problems remains intact.

    Kindly help me solve the puzzle as I keep on repeating previous steps. If problem is known, I can repair it but here I don?t know what is an issue.
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  2. #41
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    Quote Originally Posted by talhawaleed View Post
    This is what i have found with keyword vane on my engine. no result against VAF.

    image on url below shows how vaf looks like

    Vane Airflow VAF Sensor

    but did not see any such thing on this vehicle.

    it has a variable resistor, if you are referring to, which might be a similar thing and adjusts air to fuel mixture ratio.


    Diagram 45-02: VANE PUMP & RESERVOIR (POWER STEERING)
      part 44360 : RESERVOIR ASSY, VANE PUMP OIL
      part 44305 : CAP SUB-ASSY, VANE PUMP OIL RESERVOIR
      part 44443B : BRACKET, VANE PUMP
      part 44442A : BRACKET, VANE PUMP, REAR
      part 44320 : PUMP ASSY, VANE

    Diagram 16-05: V-BELT
      part 44310A : BELT, V(FOR VANE PUMP)
    what ever you call it the abbrevation name it VAF . what you are calling a resistor beside's had you cleared your inbox????

  3. #42
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    Quote Originally Posted by atta1111 View Post
    clear your inbox and yes you can find it on DIY but the refference name there is VAF sensor (Vane Airflow Sensor/ Volume Air Fuel Ratio sensor) what ever you like's to call it.
    thanks brother, inbox cleared and replied.

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    Quote Originally Posted by margallar View Post
    Our corolla was giving a similar issue. We took it to magic motors. Injectors were ultrasonically cleaned, throttle body serviced, plugs were black and so they too were replaced. Then he connected obd scanner and said that oxygen level in mixture is less than optimum, his helper adjusted something near the air filter box (I was inside the car so didnt see where). Car is normal now

    He was seeing oxygen level from the obd scanner. Initially it was 11.6 percent and he adjusted it to 12

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    magic motors where is it. maybe lahore and i am here in islamabad/rawalpindi

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    Yes it is in lahore but you get the idea of what to do. I wish I had seen which screw or knob he was adjusting

    I believe that this adjustment did the trick
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    Quote Originally Posted by margallar View Post
    Our corolla was giving a similar issue. We took it to magic motors. Injectors were ultrasonically cleaned, throttle body serviced, plugs were black and so they too were replaced. Then he connected obd scanner and said that oxygen level in mixture is less than optimum, his helper adjusted something near the air filter box (I was inside the car so didnt see where). Car is normal now

    He was seeing oxygen level from the obd scanner. Initially it was 11.6 percent and he adjusted it to 12

    Sent from my SGH-T989 using PW Forums mobile app

    That something near air filter box is variable resistor and comes in place of O2 sensor. I know this as I told the head mechanic at Toyata Rawal motors & toyata GT motors that I suspect an issue with this and he laughed. I inquired if he has a exhaust analyzer and he clearly said no so I knew it that he does not knows jack. He pointed fingers at idle air control valve and tappet settings which I already knew to be right and has very less to do with air to fuel mixture.

    I cannot blindly tune this as I need exhaust analyzer. I remember, I called few toyata motors and inquired if they have exhaust analyzer but all of the said no.

    What the heck, toyata Indus needs to know this.

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    Quote Originally Posted by atta1111 View Post
    what ever you call it the abbrevation name it VAF . what you are calling a resistor beside's had you cleared your inbox????
    @atta1111

    Ain't The MAF Sensor Is IN Those 2nZ If I Am Not Mistaken??????

    Those VAF You Are Talking Are Flap TYPE AFM's....Kindly Inform Yourself Before Asking People For Look For Thing which Won't exist In Car........!!! EC1 ka Magic Nai Ha Bhai

    ITS MAF (Mass Air Flow Sensor) Located In Air Intake Hose Or Air Flow Box Side......!!


    If Possible Replace Car ECU With Other XLI And See If It Helps......!!!

    It Can Be A Faulty ECU .....But If It Won't....Chances Are Something Is Messing Real Bad......You Need To Check Sensor Readings Manually.....!!


    did you check the readings from Crank Sensor Cam Sensor?????
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Quote Originally Posted by SER_GTR View Post
    @atta1111

    Ain't The MAF Sensor Is IN Those 2nZ If I Am Not Mistaken??????

    Those VAF You Are Talking Are Flap TYPE AFM's....Kindly Inform Yourself Before Asking People For Look For Thing which Won't exist In Car........!!! EC1 ka Magic Nai Ha Bhai

    ITS MAF (Mass Air Flow Sensor) Located In Air Intake Hose Or Air Flow Box Side......!!


    If Possible Replace Car ECU With Other XLI And See If It Helps......!!!

    It Can Be A Faulty ECU .....But If It Won't....Chances Are Something Is Messing Real Bad......You Need To Check Sensor Readings Manually.....!!


    did you check the readings from Crank Sensor Cam Sensor?????
    we are talking about VAF sensor which in sadi english pashtoo you guy's called varistor/ resistor for afr adjustments.

    so I know that haji saab you are.............

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    Thermostate value, change that. Full stop

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    They might have the analyzer but might not know its english name. Try suzuki dealers since so many old suzukies are carby so they often have the analyzer, but wont an obd scanner provide the same data?

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    Quote Originally Posted by SER_GTR View Post
    @atta1111

    Ain't The MAF Sensor Is IN Those 2nZ If I Am Not Mistaken??????

    Those VAF You Are Talking Are Flap TYPE AFM's....Kindly Inform Yourself Before Asking People For Look For Thing which Won't exist In Car........!!! EC1 ka Magic Nai Ha Bhai

    ITS MAF (Mass Air Flow Sensor) Located In Air Intake Hose Or Air Flow Box Side......!!


    If Possible Replace Car ECU With Other XLI And See If It Helps......!!!

    It Can Be A Faulty ECU .....But If It Won't....Chances Are Something Is Messing Real Bad......You Need To Check Sensor Readings Manually.....!!


    did you check the readings from Crank Sensor Cam Sensor?????
    ECU is fine, like if you unplug a sensor then it gives an error code. It properly shows the readings from other sensors meaning its working and clears the error code which appears once a wiring harness is removed. Now replacing ECU is not easy, as first its expensive and second we are not sure because nothing is indicating an issue with it and most likely problem will remain intact.

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    Quote Originally Posted by gundabunda View Post
    Thermostate value, change that. Full stop
    <!--[if gte mso 9]><xml> <w:WordDocument> <w:View>Normal</w:View> <w:Zoom>0</w:Zoom> <w:TrackMoves/> <w:TrackFormatting/> <wunctuationKerning/> <w:ValidateAgainstSchemas/> <waveIfXMLInvalid>false</waveIfXMLInvalid> <w:IgnoreMixedContent>false</w:IgnoreMixedContent> <w:AlwaysShowPlaceholderText>false</w:AlwaysShowPlaceholderText> <woNotPromoteQF/> <w:LidThemeOther>EN-US</w:LidThemeOther> <w:LidThemeAsian>X-NONE</w:LidThemeAsian> <w:LidThemeComplexScript>X-NONE</w:LidThemeComplexScript> <w:Compatibility> <w:BreakWrappedTables/> <wnapToGridInCell/> <w:WrapTextWithPunct/> <w:UseAsianBreakRules/> <wontGrowAutofit/> <wplitPgBreakAndParaMark/> <wontVertAlignCellWithSp/> <wontBreakConstrainedForcedTables/> <wontVertAlignInTxbx/> <w:Word11KerningPairs/> <w:CachedColBalance/> </w:Compatibility> <w:BrowserLevel>MicrosoftInternetExplorer4</w:BrowserLevel> <m:mathPr> <m:mathFont m:val="Cambria Math"/> <m:brkBin m:val="before"/> <m:brkBinSub m:val="--"/> <m:smallFrac m:val="off"/> <m:dispDef/> <m:lMargin m:val="0"/> <m:rMargin m:val="0"/> <m:defJc m:val="centerGroup"/> <m:wrapIndent m:val="1440"/> <m:intLim m:val="subSup"/> <m:naryLim m:val="undOvr"/> </m:mathPr></w:WordDocument> </xml><![endif]--> Once, you can read the coolant temperature sensor then you exactly know if thermostat valve is ok or not. That is perfectly fine as I can see the temperature shooting up and anyway once car starts then it suppose to run rich so has nothing to do with thermostat valve.

    You cannot blindly fire.
    <!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" DefUnhideWhenUsed="true" DefSemiHidden="true" DefQFormat="false" DefPriority="99" LatentStyleCount="267"> <w:LsdException Locked="false" Priority="0" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="Normal"/> <w:LsdException Locked="false" Priority="9" SemiHidden="false" UnhideWhenUsed="false" QFormat="true" Name="heading 1"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 2"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 3"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 4"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 5"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 6"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 7"/> <w:LsdException Locked="false" Priority="9" QFormat="true" Name="heading 8"/> <w:LsdException Locked="false" Priority="9" 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    Quote Originally Posted by margallar View Post
    They might have the analyzer but might not know its english name. Try suzuki dealers since so many old suzukies are carby so they often have the analyzer, but wont an obd scanner provide the same data?

    Sent from my SGH-T989 using PW Forums mobile app
    thats also a good idea, if toyata motors does not have it then does not says suzuki motors wont be having it.

    anyway, only way they be keeping this device if their vehicles comes with variable resistor.

    carby cars are tuned using a different method and for that i dont think you need a gas analyzer.

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    Quote Originally Posted by talhawaleed View Post
    ECU is fine, like if you unplug a sensor then it gives an error code. It properly shows the readings from other sensors meaning its working and clears the error code which appears once a wiring harness is removed. Now replacing ECU is not easy, as first its expensive and second we are not sure because nothing is indicating an issue with it and most likely problem will remain intact.
    I Say In Case You Can Test With Someone's ECU...Not Get It......For testing

    Else Get It Tested On Wideband SensorOn Cold Start To See The Mixtures Actual Readout......!!(Performance Tuner Shops In ur City Have That..Just Get The 18mm x 1.5 Bung Weld In Your Exhaust Pipe....!

    Best Is To Get STFT And LTFT But Since Its Not ...So Wideband Is Your Way To Know The AFR's
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Quote Originally Posted by SER_GTR View Post
    I Say In Case You Can Test With Someone's ECU...Not Get It......For testing

    Else Get It Tested On Wideband SensorOn Cold Start To See The Mixtures Actual Readout......!!(Performance Tuner Shops In ur City Have That..Just Get The 18mm x 1.5 Bung Weld In Your Exhaust Pipe....!

    Best Is To Get STFT And LTFT But Since Its Not ...So Wideband Is Your Way To Know The AFR's
    If nothing works then will try ECU but will use this option at last. Will also dig into wideband thing. Anyway, once you reset the trouble codes then ECU goes back to factory settings. Maybe variable resistor might would have malfunctioned, outputting different voltage, or gone bad with time. Otherwise things don’t make any sense.

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    Check The readings..Its Simple

    Check The Output Voltages Its Set On And providing To ECU.....!!
    TOYOTA Sprinter 86- AE80 DOHC 20v'D TOYOTA Corolla 98- AE101 4AFE 16v

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    Quote Originally Posted by atta1111 View Post
    not maybe sure 50000% sure your car run's lean at cold start. and clear one thing up the varient's of toyota vehicle's with Vane Sensor type does not show any fuel trimming at all clear this concept before now come toward what is happening in your vehicle right now. vane sensor has to be adjusted according to each tuneup you done at different milage's so in your case it is still at stock setting so first tell me the actual milage on your odometre so I can calculate the total tuneup volt's for the VAF.
    Thanking you so much atta for showing me a way, I tested the variable resistor in a time I had. I was able to verify the VC (Power Wire), E2 (Ground) and VAF (Signal wire). Link to the document below on EFI variable resistor was also a great help. Somehow VAF (signal wire) was not showing any voltage once I took the measurement with respect to battery?s ground as document says that Voltage is suppose to vary between 0-5Volts. While car was idling, I removed the sensor expecting a response but nothing happened, not even a engine check light like it does not matter if sensor is there or not. Again, I tried to measure the Voltage between VAF and battery?s positive and this time it turned out to be 13.30 Volts against 14.20V between battery?s terminal. Then being curious, I started to turn the variable resistor towards R and did not notice even a slight change in Voltage either with respect to battery?s positive and still showed zero w.r.t battery?s negative. Document describes values for correct resistances but here it seemed completely out of aspects and in hundreds.

    I think, I will need to buy this sensor from scrap yard, maybe problem is that this part is not working at all and further need to test everything again and verify my observations.

    http://www.moranbahweather.com/toyota/lc_trj12/rm/rm1151e/m_05_0187.pdf

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    Quote Originally Posted by talhawaleed View Post
    thats also a good idea, if toyata motors does not have it then does not says suzuki motors wont be having it.

    anyway, only way they be keeping this device if their vehicles comes with variable resistor.

    carby cars are tuned using a different method and for that i dont think you need a gas analyzer.
    its called CO tester....and suzuki township has two units

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    Quote Originally Posted by talhawaleed View Post
    Thanking you so much atta for showing me a way, I tested the variable resistor in a time I had. I was able to verify the VC (Power Wire), E2 (Ground) and VAF (Signal wire). Link to the document below on EFI variable resistor was also a great help. Somehow VAF (signal wire) was not showing any voltage once I took the measurement with respect to battery?s ground as document says that Voltage is suppose to vary between 0-5Volts. While car was idling, I removed the sensor expecting a response but nothing happened, not even a engine check light like it does not matter if sensor is there or not. Again, I tried to measure the Voltage between VAF and battery?s positive and this time it turned out to be 13.30 Volts against 14.20V between battery?s terminal. Then being curious, I started to turn the variable resistor towards R and did not notice even a slight change in Voltage either with respect to battery?s positive and still showed zero w.r.t battery?s negative. Document describes values for correct resistances but here it seemed completely out of aspects and in hundreds.

    I think, I will need to buy this sensor from scrap yard, maybe problem is that this part is not working at all and further need to test everything again and verify my observations.

    http://www.moranbahweather.com/toyota/lc_trj12/rm/rm1151e/m_05_0187.pdf
    vaf sensor ussally dont broke down so dont go for the replacement will call you later to again briefly calibration. dont worry it will get well soon

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    Quote Originally Posted by xenerking View Post
    its called CO tester....and suzuki township has two units
    even sethi motors near ganga ram had it, they used it to adjust our car's carburetor
    haters gonna hate, potatoes gonna potate

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    Quote Originally Posted by talhawaleed View Post
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    Guys, I want to bang my head with Wall. Have you ever lost your keys, what do you do, find it everywhere, look at it again and again at same place or nearby. Same is the issue with me ????

    9th generation corolla Xli, 2007 model, 135000 km on clock, with engine 2nz-fe 1nz-fe is neither vvt or vvt-i is a plain engine without O2 sensor but has variable resistor so I have no help from internet except www.toyodiy.com website which gives exact engine details, components attached along with part numbers once you insert frame no of your car on site.


    (
    03/2007 TOYOTA COROLLA (NZE120R-GEMDKP) )

    OBD test on this vehicle does not provides information related to Long Term Fuel Trim LTFT and Short term fuel trim STFT cross checked on my OBD device and that?s from Toyata Rawal Motors, Toyata GT motors so how do I determine the air to fuel mixture of this EFI car as they say that computer they have from company does not shows LTFT,STFT on this vehicle.


    PROBLEM TAG:


    Car starts well on cold start up on petrol, but stalls if we press accelerator in morning while engine is cold while on petrol. Anyway once switched to CNG then flies but after 5 minutes once temperature has reached its optimum temperature then car runs well even on petrol.


    PROBLEM TAG:

    Vehicle stumbles on cold startup if accelerated but no problem while idling.

    PROBLEM TAG:

    Car stalls on petrol once accelerated from cold startup but becomes ok once attained proper operating temperature.

    Problem is a year old problem, guess what I have tried and done numbers of times

    Fuel Pump:
    Changed with denso original

    Fuel Filter:
    Changed twice with Toyata genuine fuel filter twice in last 15000km.

    Fuel Pressure Regulator:
    changed twice in last 15000 km.

    Fuel Pressure Test:
    Nobody had fuel gauge so had to buy my own. Fuel pressure is 42PSI once clicked and does not drops below 36psi even after 5 minutes. Mechanic says that let is try to install kabli and let?s see and I am sick and tired of everyone guessing, spending my money and still no results.

    Injectors ultrasonic cleaning:
    done from Nazir autos some 7000km back, injectors were fine but were cleaned again. Since then I regulator disconnect the injectors and keep on cleaning with carburetor cleaner at times and again expecting a magic to take place. I have disconnected individual injectors several time once car is idling and it stalls indicating that fuel injectors are firing properly.

    Ignition Coils:
    although, car runs perfectly well on CNG but ignition coils were disconnected while car was idling. It stalled and showed all of them to be ok both on petrol and CNG.

    Spark Plugs:
    sick and tired of changing them, adjusting the clearance and cleaning it after every 500km. this has became a joke.

    Tappet settings and valve clearance:
    Checked before twice and again checked today. Verified to be ok and within specs.

    Trouble Codes:
    car does not gives any trouble code.

    Throttle body wash:
    throttle body cleaned, idle control valve adjusted and it seems to work fine as once its position is changed then either idle rpm increase or decreases. Throttle position sensor works ok as obd test reveals that it is changing its position once we hit accelerator.

    MAF sensor:
    it gives flow of air and also provides intake air temperature. I have bought a second hand from scrap yard, switched its position but data on both the sensors matches 100%. Toyata motors have also tried to install a new one as a smart mechanic highlighted a problem with his blind fate, changed it but problem was intact so he took it back declaring the original to be ok.

    Intake Manifold:
    recently, I started suspecting that intake manifold maybe blocked but once it was removed then it seemed clear, slightly dirty but nothing such that can block the air passage. Cleaned and was installed back but problem is intact.

    Coolant Temperature Sensor:
    suspecting that it may be a problem so I looked at its reading on EML327 once car is started. It starts from 20 C and goes all the way to 92 C and now that I look at it every time once car starts. Although, I can change this but will I keep on spending money as results looks ok.

    Intake Temperature Sensor:
    this reading varies from 55 F to 70 F depending upon the temperature and sensor comes within the MAF sensor. It has been replaced with other MAF sensor I have but OBD shows same consistent readings on both the sensors so have attached it back.

    Air Filter and Housing blockage:
    it has no blockage like people do it on CNG cars. Clear air passage, no obstructing in between. Seems fine to me , as I take it off and put it back every time. Clean it as well.

    PCV valve:
    You know this is for Engine ventilation, removed and cleaned, seems ok as air passes one way and installed back. No improvement.

    Knock Sensor:
    Today, I got it opened, although did not had any trouble code from ECU. It seemed perfectly clean from inside so got it installed again without disturbing anything.

    Variable Resistor:
    this controls the air to fuel mixture, increases supply of petrol and has a specific procedure for increasing or decreasing the petrol. But you know what, I visited toyata GT motors, Toyata motors as they did not had the specific equipment to test and adjust it. So blindly said that problem is not with this part. Manual says that it not be disturbed or adjusted without measuring the CO2 content from exhaust.

    Fuel Tank inspection:
    fuel tank opened, checked and seems ok and crystal clear.

    Engine Condition: throws water droplets out on cold startup in morning from exhaust, mechanic says that its a sign that engine is in good condition, oil changes after every 5k, diary maintained, no signs of sludge so far. rocks on cng.

    I don?t know, I have got nut, Every mechanic wants to repeat older steps, once satisfied that they are ok, then says ?I don?t know?. Even toyata mechanic says ? temporarily tries to satisfy me, charges and next day problem is back. Don?t have so much time that I keep running around a shitty reason, they keep charging me and problems remains intact.

    Kindly help me solve the puzzle as I keep on repeating previous steps. If problem is known, I can repair it but here I don?t know what is an issue.
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    I have the very same issue with my 4AFE. Never bothered to get it sorted out as all the mechanics would make a meal of it. As far as I think, it has all to do with the ECU programming. I reckon there are saved settings for engine start up i.e amount of fuel to be injected at the specific temperature. Since the engine temperature is low at cold start up, the configured settings either inject excessive fuel or less fuel. Good luck

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