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Thread: Toyota Passo Rattling during idle when cold

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    Default Toyota Passo Rattling during idle when cold

    AOA PW Brothers,
    I bought passo 2 months back.Car is running excellent but i noticed weird behavior which is common for most of Toyota's AT.

    When i start the car in morning it's is in P after the cold light vanishes and
    when i put D or R it rattles/vibrate.
    I searched a lot on different forums and found that could be engine mount
    or IAC valve malfunctioning but my engine mount is fine.

    After running the car for 7-8 kilometers vibration almost vanishes as i feel the increase in RPM.
    so when car is cold and when gear is put to D or R RPM is low as 600
    but after some time i found increase in RPM.

    In short car only vibrates when RPM is low.

    Is there anyway to troubleshoot this problem.

    I really appreciate your expert advice.

    Thanks


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    these symptoms are only when car is cold

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    long story short
    ur car vibrate due to drop of rpm
    get throtle body and icv serviced
    Life is short and very unpredictable just like a Quarter mile .....

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    Quote Originally Posted by hash4u View Post
    long story short
    ur car vibrate due to drop of rpm
    get throtle body and icv serviced
    already done brother

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    whats the RPM when engine is cold and car in P ?
    Life is short and very unpredictable just like a Quarter mile .....

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    Cold start mechanism is not functioning,get it checked.
    Never loose hope in life,every step gives u something.

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    cold start idle up not working
    Keep a cool head and wear seatbelts!

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    can any one brief how cold start mechanism for Passo is setup

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    Quote Originally Posted by hash4u View Post
    whats the RPM when engine is cold and car in P ?
    NO RPM display unit in Passo but i guess 600 RPM's

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    Just checked within hood ask my friend to start the car when it was cold and put the gear in R and apply brakes.what i found is engine mount which is in front for drivers seat shaking and when he shifted from R to P it becomes normal.
    So i guess at low RPM Passo mount is not absorbing frequency of certain level.
    Please correct me if I am wrong.
    Thanks

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    There is a IACV(idel air control valve) in passo,it's directly under the throttle body and anchored to the throttle body by screws.
    The IACV is a thermally-operated valve that opens and raises idle when the engine is cold, to speed warming of the engine and catalyst. Set correctly, it should top out at 1500 rpm, and as coolant via hoses warms the bimetallic spring inside the IACV, it'll close, slowly bringing idle down to a normal 750 rpm, fully warm. When it fails(it usually fails fully opened or fully closed),In your case it may have fully closed.
    After cleaning,it might works perfectly.
    Never loose hope in life,every step gives u something.

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    Quote Originally Posted by argtr65 View Post
    There is a IACV(idel air control valve) in passo,it's directly under the throttle body and anchored to the throttle body by screws.
    The IACV is a thermally-operated valve that opens and raises idle when the engine is cold, to speed warming of the engine and catalyst. Set correctly, it should top out at 1500 rpm, and as coolant via hoses warms the bimetallic spring inside the IACV, it'll close, slowly bringing idle down to a normal 750 rpm, fully warm. When it fails(it usually fails fully opened or fully closed),In your case it may have fully closed.
    After cleaning,it might works perfectly.
    Thanks Brother very useful information but i already get it cleaned what I am thinking is when my mechanic installed it back he missed something or not fit properly.
    What do u think about engine mounts I mean they should absorb vibrations even at low RPM when IACV is not working
    Thanks

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    Replace the fuel filter if that doesn't work than replace the fuel pump. There isn't any other way to overcome the vibration other than replacing the fuel system components with new ones if you have the 1KR-FE.
    - '06 Toyota Belta 1.0L X - '68 VW Beetle 1300 DP - '89 Nissan B12 E16

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    Quote Originally Posted by murtaza_murti View Post
    Replace the fuel filter if that doesn't work than replace the fuel pump. There isn't any other way to overcome the vibration other than replacing the fuel system components with new ones if you have the 1KR-FE.
    It's more like RPM vs Vibration if fuel filter needs to be changed then why it becomes normal when engine get warm

    Thanks

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    Quote Originally Posted by alikhan7 View Post
    Thanks Brother very useful information but i already get it cleaned what I am thinking is when my mechanic installed it back he missed something or not fit properly.
    What do u think about engine mounts I mean they should absorb vibrations even at low RPM when IACV is not working
    Thanks
    I don't think its engine mount problem,because incase of weak engine mount,you should feel vibration even after engine warm up.
    Either IACV did not clean properly or ECT Sensor not functioning,get it checked also.
    Never loose hope in life,every step gives u something.

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    Quote Originally Posted by alikhan7 View Post
    Thanks Brother very useful information but i already get it cleaned what I am thinking is when my mechanic installed it back he missed something or not fit properly.
    What do u think about engine mounts I mean they should absorb vibrations even at low RPM when IACV is not working
    Thanks
    To my knowledge the 1KR-FE does not have an IACV, but I am surprised to hear it does. Would you be kind enough to tell me where is it exactly located?
    - '06 Toyota Belta 1.0L X - '68 VW Beetle 1300 DP - '89 Nissan B12 E16

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    Quote Originally Posted by argtr65 View Post
    I don't think its engine mount problem,because incase of weak engine mount,you should feel vibration even after engine warm up.
    Either IACV did not clean properly or ECT Sensor not functioning,get it checked also.
    I guess ur right last night before leaving office i started the car and wait until blue light vanishes then apply accelerator car was still on P wait two minutes more.After i put it on R there' was still vibration but less than before and then it completely vanishes after 10 minutes of drive.

    I still have few questions in mind

    My father told me keep it as it's and don't let any mechanic to experiment coz they might ruin due to lack of knowledge.

    Where's ECT sensor located.

    What is the difference between MAP and IACV sensor?

    finally Vibration is harmful or we can ignore it.?

    Thanks

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    Quote Originally Posted by alikhan7 View Post
    What is the difference between MAP and IACV sensor?
    MAP: Manifold Absolute pressure sensor, it provides the manifolds pressure information to the ECU. It determines the air mass flow rate which then determines the fuel metering. Some engines have MAF sensors instead of MAP sensors, the 1KR-FE has a MAP sensor.

    IACV: Idle Air Control Valve, it basically controls the air going into the engine on idle and adjusts the idle speed.
    - '06 Toyota Belta 1.0L X - '68 VW Beetle 1300 DP - '89 Nissan B12 E16

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    Quote Originally Posted by alikhan7 View Post
    I guess ur right last night before leaving office i started the car and wait until blue light vanishes then apply accelerator car was still on P wait two minutes more.After i put it on R there' was still vibration but less than before and then it completely vanishes after 10 minutes of drive.

    I still have few questions in mind

    My father told me keep it as it's and don't let any mechanic to experiment coz they might ruin due to lack of knowledge.

    Where's ECT sensor located.

    What is the difference between MAP and IACV sensor?

    finally Vibration is harmful or we can ignore it.?

    Thanks
    Toyota Passo Rattling during idle when cold - RVxcH2DAAAA4C4CWUD4AAAA4DeJMwpxFQAAAPwgyAIAAAB4E8uC1uFLAAAAPg1WJYAAAAA3iALAAAA4A2yAAAAAN4gCwAAAODNP6uXwTo5R3fNAAAAAElFTkSuQmCC


    There is no harm,if engine doesn't vibrate vigorously.


































    Toyota Passo Rattling during idle when cold - RVxcH2DAAAA4C4CWUD4AAAA4DeJMwpxFQAAAPwgyAIAAAB4E8uC1uFLAAAAPg1WJYAAAAA3iALAAAA4A2yAAAAAN4gCwAAAODNP6uXwTo5R3fNAAAAAElFTkSuQmCC
    Never loose hope in life,every step gives u something.

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    engine ka abrupt vibration mounts ki life short kar dayta hai. mayra khayal hai rear engine mount has developed some cracks. no harm in checking it will not take more then an hour to remove & inspect in bright light rubber fractures become visible.

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