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Thread: Civic 99 Drinking Petrol like Sharbat

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    Thumbs up (FINALLY SOLVED) Civic 99 Drinking Petrol like Sharbat

    Salam PWs
    My civic is drinking petrol like hell. does only 300 kms per tank on highway & even less in city. The petrol needle can be felt going down while driving. there is no leakage & car moves great on petrol. no problem in driving.
    On CNG it does 200kms per 55cylinder. can u tell me how to increase petrol average. i have the advancer installed and it works. no problem on driving on CNG or PETROL. plz help

    ***EDIT***
    Problem Solved
    For all lazy people like me See Last Page


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    ^ he doesnt have diagnostic equipment.
    btw did u have ur sensors checked/analyzed on computer?
    Tell ur mechanic to confirm following
    - fuel pressure regulator working
    - fuel return line is not clogged.
    - all fuel injectors r working fine
    i hope there is no fuel smell in car & ur petrol tank cap is air tight.
    btw have u checked the wheel bearings. if ur wheels r hard to rotate then mileage go down the drain.
    hows the feel of engine. sound wise & power wise. do u hav to press hard to get it moving or if engine makes higher than normal noise, means more acceleration less speed.

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    Quote Originally Posted by xsxd View Post
    is there actually such a thing as "IACV to engine match" ... the parts guy keeps telling me iacv match nahi ho raha
    get the iacv from a running engine of same type from junk. for visual matching the rubber o-ring (seal) must match both engine & iacv side grooves. must have same no of wires as ur harness have.

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    @xsxd
    Wat abt the wiring of iacv. hav u cheked it?
    it has 1 power wire 5V constant
    middle wire is signal wire varies between 0-5V as per coolant temp & ecu
    3rd wire is ground 0V. must hav continuity to battery -ve terminal.

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    Quote Originally Posted by xsxd View Post
    i had a similar idea becuz i have seen the iacv from the inside. the end displayed in the picture has a beeswax component inside it which helps determine when to move the shaft... and moving this tiny part (displayed in pic) will only move the shaft. and my mech repositioned the iacv shaft after he was done cleaning it, so doing this didnt seem to sensible to me.

    thanks irfan... rest up your fingers a bit
    did u say wax. iacvs dont have wax. fitvs do have wax. u r confusing me again. how did ur mech open it? by rotating it anticlockwise like a screw? if yes then its an FITV.

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    well i think i will have to get a multimeter and fiddle with my car myself... the mechs dont listen... the iacv wiring was never touched... it originally had a 3 wire setup...

    as for the beeswax component... i was told that its beeswax (whereas it looked more like some composite of plastic to me). its a small green cap like thing inside the bottom of the iacv (above a spring loaded thermostat type component).

    the iacvs i get are taken off JDM D15B 3-Stage engines... the o-ring seals are the same as my cars...
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    it looks something like this (may be some differences cuz i havent really checked)Civic 99 Drinking Petrol like Sharbat - 346877
    this is actually the old iacv taken off, used to work fine till the ecu was changed from P2M-N92 (OBD2b) to P2J-J72 (OBD2a)

    the moment the ecu was rewired, connected and the engine started, the car started revving really high.

    I m just worried about the problem being with the ecu wiring (cuz the rpm doesnt go up when i turn the AC on, instead it goes further down) but everyone i have had it checked from says its the iacv.
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Ya its the iacv. 100% confirm. But it's too slimy.
    Did u change the wiring harness with it or just the ecu. I think u changed it caz the 3 stage vtec wasn't working with the previous 1.
    Anyway check the wiring connectivity. Does the 2 ecus has the same pinouts. Check out if some pins r different on both ecus. Google it. Some iacvs hav their power & groung wires swapped.
    Get to work


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    I think i have found ur problem.
    U hav swapped an OBDb ecu with OBDa ecu but u r using an OBD2b wire harness. It's pinouts on ecu r different. U should have swapped the harness as well. But it can still b sorted out. Read post no 108 on the link below. It has ur solution
    http://honda-tech.tv/showthread.php?p=46040230


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    Quote Originally Posted by irfan44 View Post
    I think i have found ur problem.
    U hav swapped an OBDb ecu with OBDa ecu but u r using an OBD2b wire harness. It's pinouts on ecu r different. U should have swapped the harness as well. But it can still b sorted out. Read post no 108 on the link below. It has ur solution
    JDM D15B 3-stage, P2J ECU, EGR, O2 Sensor, Wiring Checklist, PICS! - Page 5 - Honda-Tech


    Sent from my iPhone using Tapatalk
    ecu pinouts were re-wired using the attached diagrams

    my iacv was already a 3-wire... still is... should that be changed to a 2? I have read that post before but i couldnt conclude much off of it. Are you suggesting that i use a 2-wire harness?

    Are all D15B supposed to use a 2-wire harness?

    OBD2a Pinout
    Civic 99 Drinking Petrol like Sharbat -408787

    OBD2b Pinout
    Civic 99 Drinking Petrol like Sharbat -408788
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Default Drinking Fuel - Civic EXI PT 2005 Petrol

    Quote Originally Posted by irfan44 View Post
    ^ he doesnt have diagnostic equipment.
    btw did u have ur sensors checked/analyzed on computer?
    Tell ur mechanic to confirm following
    - fuel pressure regulator working
    - fuel return line is not clogged.
    - all fuel injectors r working fine
    i hope there is no fuel smell in car & ur petrol tank cap is air tight.
    btw have u checked the wheel bearings. if ur wheels r hard to rotate then mileage go down the drain.
    hows the feel of engine. sound wise & power wise. do u hav to press hard to get it moving or if engine makes higher than normal noise, means more acceleration less speed.
    Hi Irfan;
    Got my car rechecked with following findings on idle:
    OBD reading: No Problem Found
    CO: 0.11% (it was 0.14% earlier. I erroneously mentioned 1.04% sorry)
    HC: 145 ppm
    CO2: 13.55%
    Fuel Injectors: No leakage found
    Petrol smell: No smell or leakage anywhere
    I asked him to check ECU, MAP Sensors and Fuel Return Line. To that he said that everything is okay. If any of those things were faulty, the engine check-light would have turned on and the computer would have found the problem. Even the engine sound would be wierd.
    Finally, he said, nothing is wrong. Guess, he was too busy as he had many cars parked outside in que waiting for their turn.

    Anyways, took it to another technician and explained the situation. That person just saw one of the spark plugs and found them sooted (a bit black). Do note that the spark plugs were just replaced 6 days before.
    To that he said that no doubt your car is drinking fuel and if all the computer reading is off, the problem must be with the Throttle Body and suggested me to either have it changed from Honda, or he can arrange it from Shershah (junk-yard) for Rs.9000... and if I want, he can try cleaning it completely (by taking it off the car) for Rs.1500 but no guarantees.

    He also suggested me to mix High Octane and drive, which I just did.

    This is the complete situation as of now.

    Please suggest what do you all think the problem is and what should my next step be? Should I take my car to Honda or... what???

    Please HELP!!!

    Thanks much.

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    Have the Honda guys run a diagnostics on your ride... see what diagnosis they give u... and then get it done either from them or the market
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    okay. thanks

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    Quote Originally Posted by aziz247 View Post
    Hi Irfan;
    Got my car rechecked with following findings on idle:
    OBD reading: No Problem Found
    CO: 0.11% (it was 0.14% earlier. I erroneously mentioned 1.04% sorry)
    HC: 145 ppm
    CO2: 13.55%
    Fuel Injectors: No leakage found
    Petrol smell: No smell or leakage anywhere
    I asked him to check ECU, MAP Sensors and Fuel Return Line. To that he said that everything is okay. If any of those things were faulty, the engine check-light would have turned on and the computer would have found the problem. Even the engine sound would be wierd.
    Finally, he said, nothing is wrong. Guess, he was too busy as he had many cars parked outside in que waiting for their turn.

    Anyways, took it to another technician and explained the situation. That person just saw one of the spark plugs and found them sooted (a bit black). Do note that the spark plugs were just replaced 6 days before.
    To that he said that no doubt your car is drinking fuel and if all the computer reading is off, the problem must be with the Throttle Body and suggested me to either have it changed from Honda, or he can arrange it from Shershah (junk-yard) for Rs.9000... and if I want, he can try cleaning it completely (by taking it off the car) for Rs.1500 but no guarantees.

    He also suggested me to mix High Octane and drive, which I just did.

    This is the complete situation as of now.

    Please suggest what do you all think the problem is and what should my next step be? Should I take my car to Honda or... what???

    Please HELP!!!

    Thanks much.
    Your car is obviously running quite rich (carbon fouled plugs).

    1. Check TPS range and values at idle & WOT. If you have a multimeter then that would be easy.
    2. Get fuel pressure checked. It is done by attaching a guage. Make sure a genuine fuel filter is present and installed. Some people tend to remove it and then the fuel pressure becomes too high.
    3. If all is fine then you might want to check your radiator system (make sure coolant is good) and replace the water temperature sensor.

    Is your radiator fan direct? (meaning running all the time)
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    Hi PWs;

    Got everything checked and fine. Even topped the tank with 50% High Octane and 50% Premium Petrol. Consumption improved to 8.25 kms/liter with 75% on AC.

    One of my friends revved up the car in Neutral and observed the limiter at 6-6.5 rpm instead of 8. (The car is completely on petrol all through). Then checked gear shifting on high torque (pedal on the ground) and noticed that the gear shift from 1st to 2nd was done on max 5-5.5 rpm.

    CAN THIS BE AN ISSUE related to poor fuel mileage???

    My friend said that the limiter must go upto 8 rpm in Neutral and the first gear shift should be at 6 rpm not before, else it might be that the ECU has been replaced???

    Any thoughts??? Please advise.

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    1. in neutral, the 'rev limit' you are observing is actually fuel cut-off... which is entirely normal. as long as you have the standard ecu, the fuel cut-off will engage. why would you want the RPM to go to 8K in neutral anyways? Even if you're into racing, (as far as i know) all cars have a "sweet spot" RPM range where launch is optimal... and from what i read this car is a daily driver for u.

    2. an auto civic will make its first shift just before 5.5 even if u floor it... that again is normal. 2nd shift can be pushed to 6K (if he was trying to engage vtec in the first gear, in my experience i have never been able to accomplish that. civic can be easily pushed to engage vtec on 2nd gear)

    3. 8.25kpl on 75% AC is considered good for my car at least (civic 99 oriel AT)
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
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    more learned members can correct me where i am wrong... or explain further if need be. my advice, listen more to the car than to your friends

    PS... some JDM ECUs like the P2J-J72 do not have a fuel cut-off...
    Civic '99 VTi Oriel D15B 3-Stage VTEC A/T
    JVC KD-G645, Sony XS-GTR1720S, Pioneer TS-D691S, Rogers RA-6400 4CH, Addzest APA2100 2CH

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    Quote Originally Posted by aziz247 View Post
    Hi PWs;

    Got everything checked and fine. Even topped the tank with 50% High Octane and 50% Premium Petrol. Consumption improved to 8.25 kms/liter with 75% on AC.

    One of my friends revved up the car in Neutral and observed the limiter at 6-6.5 rpm instead of 8. (The car is completely on petrol all through). Then checked gear shifting on high torque (pedal on the ground) and noticed that the gear shift from 1st to 2nd was done on max 5-5.5 rpm.

    CAN THIS BE AN ISSUE related to poor fuel mileage???

    My friend said that the limiter must go upto 8 rpm in Neutral and the first gear shift should be at 6 rpm not before, else it might be that the ECU has been replaced???

    Any thoughts??? Please advise.
    You did not say how you tested injectors to be fine?
    Selling Vitz+local cars - compatible bluetooth Ecu Scantool, High-amp car chargers, Apple-certified Lightning Cables, etc. Click on my name and see my started threads for details.

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    Quote Originally Posted by aziz247 View Post
    Hi Irfan;
    Got my car rechecked with following findings on idle:
    OBD reading: No Problem Found
    CO: 0.11% (it was 0.14% earlier. I erroneously mentioned 1.04% sorry)
    HC: 145 ppm
    CO2: 13.55%
    Fuel Injectors: No leakage found
    Petrol smell: No smell or leakage anywhere
    I asked him to check ECU, MAP Sensors and Fuel Return Line. To that he said that everything is okay. If any of those things were faulty, the engine check-light would have turned on and the computer would have found the problem. Even the engine sound would be wierd.
    Finally, he said, nothing is wrong. Guess, he was too busy as he had many cars parked outside in que waiting for their turn.

    Anyways, took it to another technician and explained the situation. That person just saw one of the spark plugs and found them sooted (a bit black). Do note that the spark plugs were just replaced 6 days before.
    To that he said that no doubt your car is drinking fuel and if all the computer reading is off, the problem must be with the Throttle Body and suggested me to either have it changed from Honda, or he can arrange it from Shershah (junk-yard) for Rs.9000... and if I want, he can try cleaning it completely (by taking it off the car) for Rs.1500 but no guarantees.

    He also suggested me to mix High Octane and drive, which I just did.

    This is the complete situation as of now.

    Please suggest what do you all think the problem is and what should my next step be? Should I take my car to Honda or... what???

    Please HELP!!!

    Thanks much.
    Dont jump to throttle body replacement without finding the culprit.
    BTW if u get 8.5 kmpl with 75% AC on an auto civic Then i think u r good as already said by XSXD.

    as of getting no errors on computer obd2 diagnostics
    - the fuel pressure & clogged return line will not show an error in these models
    - The recommendation of getting diagnostics 4m honda was caz even if there r no errors even then they can compare sensor outputs to the standard/ default readings from their charts. so find a good 3s who knows the normal working ranges of output 4m sensors.

    Hav u got exhaust analysis on petrol or only cng

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    Quote Originally Posted by ahsanonline View Post
    You did not say how you tested injectors to be fine?
    If we run on CNG then fuel injectors r prone to blockage. I had to clean my injectors yesterday caz whenever i run the car on cng for a month without using it on petrol it starts giving injector problems on petrol.
    so always keep a can of injector /TB cleaner at hand or u can spend the money u saved using cng to get the injectors cleaned/replaced.

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    Quote Originally Posted by xsxd View Post
    ecu pinouts were re-wired using the attached diagrams

    my iacv was already a 3-wire... still is... should that be changed to a 2? I have read that post before but i couldnt conclude much off of it. Are you suggesting that i use a 2-wire harness?

    Are all D15B supposed to use a 2-wire harness?

    OBD2a Pinout
    Civic 99 Drinking Petrol like Sharbat - 408787

    OBD2b Pinout
    Civic 99 Drinking Petrol like Sharbat - 408788
    No, not all D15Bs use 2 wire iacvs. there is a difference in intake manifold. the engines we get here from kabaar have gone through a process of jugar. intake, exhaust, alternator, compressor, TB, etc all come from different engines & meshed together to form an engine. rarely u get a 1 piece engine if u r lucky. have u checked all three wires for wiring problems

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