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    Default How to check a faulty MAP Sensor?

    I am running 4EFE motor in EE80 86'rolla . And it is drinking fuel like anything. How can i check if it is having a faulty MAP sensor? i can smell of unburnt petrol.
    Using MAP Sensor #89420-12070

    Your precious suggestions are warmly welcomed!

    Click here for SOLUTION


    Seek and ye shall find!

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    CEL is on ?
    None of the brave deserve fair....

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    No. but the problem is fuel consumption + i can smell petrol from exhaust
    Seek and ye shall find!

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    check for leaking injectors first and check the little vacuum pipe for the fuel pressure regulator too.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Desi tip. Start the car and sit close to exhaust. If ur eyes feel itching/burning, map sensor is not working

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    Quote Originally Posted by misteek View Post
    Desi tip. Start the car and sit close to exhaust. If ur eyes feel itching/burning, map sensor is not working
    Na yar..........I am sure that tip was given by a mechanic who wanted to become doctor.........come on how come eyes are linked to MAP? on lighter side and no offence to OP @Xulfiqar i was imagining a marketing statement that would result by person having such skills..........

    "Yahan Har Qisam k garion ka diagnostic tajurba kar Ankhoon se kia jata ha, Neez Phookon se ilaj be kia jata h"

    @saadeez101 following may help you step wise diagnostic.for your rich running car.


    1. Bad Fuel Pump Regilator (Causing excessive pressure, check fuel pressure by gauge)
    2. Bad/ Clogged fuel Injectors (check their Pattern on ANSU or any ultrasonic cleaning machine)
    3. Clogged Return Line (same as 1)
    4. Get Scanner hooked up and see the Intake Manifold Pressure reading at idle and on pressing throttle. It should change if does not then your map is problematic
    5. Do you have Missing Symptoms?



    93 Accord CB7 (Sold) / 2005 CL7

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    ive checked the wiring of MAP sensor, it seems correct. injectors arent leaking, and did @misteek 's checkup, and got itching

    please correct me if i am wrong, "fuel pressure regulator" is the one which is connected at one end of fuel rail
    Seek and ye shall find!

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    Yes and it has pipe going to tank but you cant physically test it. Use pressure gauge
    93 Accord CB7 (Sold) / 2005 CL7

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    use nose buds to stop smelling fuel, how can a vehicle drink fuel ? is it high fuel consumption & bad air fuel mixture you are referring to ?
    - www.crackwheels.com - A skilled Dictator is much more beneficial to Country......than a Democracy of Ignorant people

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    Quote Originally Posted by saadeez101 View Post
    ive checked the wiring of MAP sensor, it seems correct. injectors arent leaking, and did @misteek 's checkup, and got itching

    please correct me if i am wrong, "fuel pressure regulator" is the one which is connected at one end of fuel rail
    Ok your map sensor is faulty. I had the same problem. Replacing MAP sensor solved the problem.
    You can confirm it by two more tests.
    1. Rev the car and see the emitting smoke. It must be black.
    2. Take your car to any ENERCON workshop. The one i know is at F-7 markaz PSO pump. The guy named Tayyab there. He has computerized equipment to check emissions. He puts a stick type thing in the exhaust and the computer measures the emissions. If the car is rich on fuel, the computer will tell you. Desi term for this problem is "Gari kacha maar rahi hy"

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    Quote Originally Posted by afnan.bashir View Post
    Na yar..........I am sure that tip was given by a mechanic who wanted to become doctor.........come on how come eyes are linked to MAP? on lighter side and no offence to OP @Xulfiqar i was imagining a marketing statement that would result by person having such skills..........

    "Yahan Har Qisam k garion ka diagnostic tajurba kar Ankhoon se kia jata ha, Neez Phookon se ilaj be kia jata h"

    @saadeez101 following may help you step wise diagnostic.for your rich running car.


    1. Bad Fuel Pump Regilator (Causing excessive pressure, check fuel pressure by gauge)
    2. Bad/ Clogged fuel Injectors (check their Pattern on ANSU or any ultrasonic cleaning machine)
    3. Clogged Return Line (same as 1)
    4. Get Scanner hooked up and see the Intake Manifold Pressure reading at idle and on pressing throttle. It should change if does not then your map is problematic
    5. Do you have Missing Symptoms?



    I invented it myself. I had the same problem and got it solved.
    and the list of problems you provided dont miss any thing.
    Patient aaye ga to diseases ki list pakra daina k aik na aik disease aap ko ho gi. Bus is list se check kar lein aap, lol

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    Quote Originally Posted by misteek View Post
    I invented it myself. I had the same problem and got it solved.
    and the list of problems you provided dont miss any thing.
    Patient aaye ga to diseases ki list pakra daina k aik na aik disease aap ko ho gi. Bus is list se check kar lein aap, lol
    Khair its the rite way to do it even if you don't agree, You rule out things one by one rather than going with intuition and saying you have this problem without going to proper route.
    93 Accord CB7 (Sold) / 2005 CL7

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    Quote Originally Posted by capsat View Post
    use nose buds to stop smelling fuel, how can a vehicle drink fuel ? is it high fuel consumption & bad air fuel mixture you are referring to ?
    you got it boss
    Seek and ye shall find!

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    Quote Originally Posted by afnan.bashir View Post
    Khair its the rite way to do it even if you don't agree, You rule out things one by one rather than going with intuition and saying you have this problem without going to proper route.
    You might have unlimited time and resources then

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    Quote Originally Posted by misteek View Post
    You might have unlimited time and resources then
    Question have you ever seen diagnostic manuals ? They have diagnostic flow for everything which I mentioned. Show reference to your manual where it is said bad MAP contributes to itchy eyes

    Sent from my HTC One using PW Forums mobile app
    93 Accord CB7 (Sold) / 2005 CL7

  16. 27-07-2014, 01:59 PM

    PakWheeler


  17. 27-07-2014, 06:21 PM

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  18. 27-07-2014, 06:22 PM

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    It is about diagnosing the problem and is never ever said to exact part without any certain logic. I do not deny your way of itching eyes with faulty MAP but you never explained your logic? what if you sit near exhaust and your ear starts itching does that makes faulty TPS? come on i am biased towards helping people the correct way.

    For reference see the image from user manual the way things are done professionally.

    How to check a faulty MAP Sensor? - P0108diagnostic
    93 Accord CB7 (Sold) / 2005 CL7

  20. 27-07-2014, 08:28 PM

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  21. 27-07-2014, 08:30 PM

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  22. 27-07-2014, 08:38 PM

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    Default What Cause 4efe poor petrol consumption in ee90 corolla

    I have 4efe engine in ee90 corolla and I have already spent lot of money on ring piston and valve seals etc, because it was smoking and reduced the engine oil. But still I have facing very poor fuel consumption. It just give my 4 to 5 km per liter of petrol.
    The engine is on standard pistons and open first time.
    My mechanic suggested me to replace the plug wires as I have changed these once damaged by the rat few month ago and changed the fuel injectors.
    But I can't understand these myths that how it possible for the car to give 12 to 13 km per liter on local after changing these parts.?

    Any help will really appreciated, thanks.

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    @saadeez101 I have the same problems with same engine 4efe in ee90 corolla

    1: Poor fuel economy just ( 4 to 5 km per liter )
    2: kacha petrol ( Petrol Smell )

    Can not check on computer because it is altered car not genuine as said by the computerized workshop mechanic.

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    Quote Originally Posted by xhzad87 View Post
    @saadeez101 I have the same problems with same engine 4efe in ee90 corolla

    1: Poor fuel economy just ( 4 to 5 km per liter )
    2: kacha petrol ( Petrol Smell )

    Can not check on computer because it is altered car not genuine as said by the computerized workshop mechanic.
    it could be done if the wiring was done properly. i also had to fix my wiring. the best approach towards solution is, if you done the engine wiring properly, you can buy un-cut wiring from engines market, and then get it joined with the car's wiring with some good electrician.

    There could be many reasons for bad fuel consumption, but first you should sort the problem of wiring, because in these efi engines, there is a brain(computer), which takes decision for utilizing fuel. And if brain is not getting input , it cannot made good decision.
    Seek and ye shall find!

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    I found Mr. @afnan.bashir 's solution the best:
    Quote Originally Posted by afnan.bashir View Post
    Na yar..........I am sure that tip was given by a mechanic who wanted to become doctor.........come on how come eyes are linked to MAP? on lighter side and no offence to OP @Xulfiqar i was imagining a marketing statement that would result by person having such skills..........

    "Yahan Har Qisam k garion ka diagnostic tajurba kar Ankhoon se kia jata ha, Neez Phookon se ilaj be kia jata h"

    @saadeez101 following may help you step wise diagnostic.for your rich running car.


    1. Bad Fuel Pump Regilator (Causing excessive pressure, check fuel pressure by gauge)
    2. Bad/ Clogged fuel Injectors (check their Pattern on ANSU or any ultrasonic cleaning machine)
    3. Clogged Return Line (same as 1)
    4. Get Scanner hooked up and see the Intake Manifold Pressure reading at idle and on pressing throttle. It should change if does not then your map is problematic
    5. Do you have Missing Symptoms?




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