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Thread: Need Professional Assistance: Corolla 94

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    Angry Need Professional Assistance: Corolla 94

    Hey, I have a 94 Corolla with automatic transmission having 16 valve efi engine. Problem is that my RPM is not stable, most oftenly when break is applied and sudden acceleration brings the RPM to 0 and engine shuts off. However, it does not happen when i wait and after 2 or 3 seconds start accelerating gently.
    One thing more is that i am experiencing very bad break when A/C is on. The paddle is fine but the break is not effective. Without A/C it is quite effective but not up to the mark. I recently changed the rear drum brakes and converted it to disc brakes but it did not help me alot.
    I am expecting some pro assistance in this matter as this is just freaking me out .
    Anyone from Rawalpindi/Islamabad can contact me to check it in person...

    One thing more which i just forgot to mention is that it is happening on CNG and not on Petrol. But the engine is felt heavy on both. Like not getting the acceleration w.r.t throttle

    Love is the seventh sense, which destroys all the six senses... :-)

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    first of all get your throttle body cleaned
    ~ Be a responsible citizen and always drive safely ~

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    because of LOW RPMs your braking is not that effective ... no matter what but your Engines RPMs shouldn't go below 900
    ~ Be a responsible citizen and always drive safely ~

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    Default Its done

    Quote Originally Posted by aantherax View Post
    first of all get your throttle body cleaned
    throttle was cleaned twice, plugs were changed, plug wires were checked. Any other thing to check?
    Love is the seventh sense, which destroys all the six senses... :-)

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    ok bro listen up .

    1)Get your air intake sensor ... the one which is fixed in your air intake pipe after airfilter... .. for checking that its working or not ... take it off while the car is on idle ... if the rpm drops or changes then its working .,... if nothing happens ... then get your sensor wiring or your sensor will be replaced ////
    2) get your brake head cylinder checked if its making full compression .... plus brake will not have full compression if the rpm goes 0 or drops ....you must be felling a heavy power steering as well ...

    3)last will O2 sensor ... is it 1.6 4afe or 1.5 5afe engine

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    Quote Originally Posted by twinturbo View Post
    ok bro listen up .

    1)Get your air intake sensor ... the one which is fixed in your air intake pipe after airfilter... .. for checking that its working or not ... take it off while the car is on idle ... if the rpm drops or changes then its working .,... if nothing happens ... then get your sensor wiring or your sensor will be replaced ////
    2) get your brake head cylinder checked if its making full compression .... plus brake will not have full compression if the rpm goes 0 or drops ....you must be felling a heavy power steering as well ...

    3)last will O2 sensor ... is it 1.6 4afe or 1.5 5afe engine
    very true about the 2nd point, i do feel heavy power steering and sometimes it also shuts the engine off when extremely turned to either side. Also can you explain how to check brake head cylinder compression?

    Its 4afe 1.6.

    I will check the air intake sensor and post the situation after a while.

    Thanks for the response.
    Love is the seventh sense, which destroys all the six senses... :-)

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    get it tuned nd get the concernd sensors cleaned.
    ''Peace is an unstable equilibrium,that can only be preserved by acknowledged supremacy and...equal power.'' ''We give up the fort when there is not a man left to defend it.''

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    the problem seems to be low fuel pressure, sudden loss of power when accelerating is usually low fuel pressure or sticky injectors.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    boota :
    bro no buddy is a magician .. you need to find the problem in step by step process.
    1) check n clean all sensors (in our country dust is the main culprit)
    2) clean injectors n check if needs to be changed
    3) fuel tank cleaning (includes
    a)fuel pump pressure b)fuel filter attached c)cleaning fuel tank )

    4)fuel pump ever run dry or on very low fuel ... if yes then check fuel pump first.

    i agree with immad n xulfi .. but do it step by step you may solve it on step one and save your time energy n money...

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    the issue is that, checking fuel pump pressure by the finger over pipe method is crazy - you need proper gauges otherwise you might as well try to win a peeing contest against a horse.

    in regular terms - please do a systematic check with correct procedures.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    My silly advice, kahin vacuum ka masla tu nahi? may be brake booster or any other vacuum line is leaking vacuum.
    I dont know much but lets see what gurus say.
    Prepare for the worst, Hope for the best.

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    Quote Originally Posted by twinturbo View Post
    boota :
    bro no buddy is a magician .. you need to find the problem in step by step process.
    1) check n clean all sensors (in our country dust is the main culprit)
    2) clean injectors n check if needs to be changed
    3) fuel tank cleaning (includes
    a)fuel pump pressure b)fuel filter attached c)cleaning fuel tank )

    4)fuel pump ever run dry or on very low fuel ... if yes then check fuel pump first.

    i agree with immad n xulfi .. but do it step by step you may solve it on step one and save your time energy n money...
    Thanks for the advice. Can you specify each and every sensor? I will be needing some advice how to choose a mechanic. My mechanics just know how to hammer a car... so taking sensor stuff to my mechanic/electrician will be crazy...

    the issue is that, checking fuel pump pressure by the finger over pipe method is crazy - you need proper gauges otherwise you might as well try to win a peeing contest against a horse.

    in regular terms - please do a systematic check with correct procedures.
    Thanks Xulfiqar bhai. Can you elaborate as I am noob in this field and with the terms used for parts. Sorry to bother but if you can help me out

    I added some extra info which i just forgot to mention. Its happening on CNG not on Petrol. Still on petrol engine seems heavy and not accelerate w.r.t. the throttle given.
    Love is the seventh sense, which destroys all the six senses... :-)

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    Originally Posted by twinturbo Need Professional Assistance: Corolla 94 - viewpost

    1)Get your air intake sensor ... the one which is fixed in your air intake pipe after airfilter... .. for checking that its working or not ... take it off while the car is on idle ... if the rpm drops or changes then its working .,... if nothing happens ... then get your sensor wiring or your sensor will be replaced ////
    bro nothing happens when the sensor is taken out. Also the sensor is in the filter box and not in the pipe.
    Love is the seventh sense, which destroys all the six senses... :-)

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    that little sensor is just an air temperature sensor (most people assume that all toyota engine use a MAF like the ZZ engines).

    Find a mechanic that can do a good fuel pressure check, this mechanic should have proper gauges to measure fuel pressure. A good mechanic would repair it systematically.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Thumbs up

    GURU - how about the boaster vaccum pipe valve from intake manifold ... he mentioned brake problem & drop of RPM with Aircon as well -

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    thats part of the systematic check I mentioned.

    fuel
    ignition
    manifold vacuum
    engine compression

    manifold vacuum would entail brake booster.
    ZRS - Zulfiqar Racing Systems ..... - professionals at work - at crackwheels.com

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    Quote Originally Posted by Xulfiqar View Post
    that little sensor is just an air temperature sensor (most people assume that all toyota engine use a MAF like the ZZ engines).

    Find a mechanic that can do a good fuel pressure check, this mechanic should have proper gauges to measure fuel pressure. A good mechanic would repair it systematically.
    Can you or anyone else here help me in finding a good mechanic in Rawalpindi/Islamabad?
    Love is the seventh sense, which destroys all the six senses... :-)

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    boota as you said that it happens on cng not on petrol... but petrol still is not up to the mark............ so clearly the sensors are out of question cuz they dont work ... rather blinded ... on cng ... so if you take the same air temp sensor out wile the car is on petrol and start then it will have sudden changes in rpm..... im sure you checked the sensor on cng ... so it will not make any difference ... on cng sensors are off .. so the problem is not sensors //// now its clearly a CNG amulator advancer issue ... you need to find a cng machanic .. and dont fiddle with the car sensors ecu / electronics ..

    do you smell gas under the hood ...if yes .. then tell the cng guy to see if the spring machanisim is working fine .. so you car rpm should maintain //// cuz there is a small spring in the cng main kit that at times breaks or slipps into the cng main kit... its for 100rs +100 labour .. you will be good

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    Quote Originally Posted by twinturbo View Post
    boota as you said that it happens on cng not on petrol... but petrol still is not up to the mark............ so clearly the sensors are out of question cuz they dont work ... rather blinded ... on cng ... so if you take the same air temp sensor out wile the car is on petrol and start then it will have sudden changes in rpm..... im sure you checked the sensor on cng ... so it will not make any difference ... on cng sensors are off .. so the problem is not sensors //// now its clearly a CNG amulator advancer issue ... you need to find a cng machanic .. and dont fiddle with the car sensors ecu / electronics ..

    do you smell gas under the hood ...if yes .. then tell the cng guy to see if the spring machanisim is working fine .. so you car rpm should maintain //// cuz there is a small spring in the cng main kit that at times breaks or slipps into the cng main kit... its for 100rs +100 labour .. you will be good
    So you are saying that if I manage to clear the spring or any CNG issue, it will also be fine with petrol too?
    I am in Lahore nowadays, so, on my next trip to home, i will definitely go to some mechanic and let it be checked. Problem is that I am unable to find some good mechanic in my area. Everyone is making cash and talking too much and no work is done... Thats my experience
    Love is the seventh sense, which destroys all the six senses... :-)

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    lahore mai bhi mechanic hain diagnostic centre somewhere near kalma chowk i read in this forum k pass puccay tools hai waheen visit kar

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