Question about 2000 Isuzu Trooper

1 Answer

Unstable RPM - is this also a safety issue??

During idle or slow moving, randomly the RPM is rising to values almost up to 2000, then reduces randomly. Sometimes even causes the vehicle to accelerate without any warning. This phenomena happans few times a year and disappears.
Service Isuzu garage cannot identify the problem as it shows and dissapears occasionally.
Is therer any official Isuzu email that can help??

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  • yorasense Feb 19, 2009

    Thank you for the tip. I have heard about this treatment for fuel injection engins. Is it safe for Isuzu diezel engin year model 2000?

    Have you experienced this treatment for the trooper??

    will appreciate your comment

    Thanks again

×

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  • Isuzu Master
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Yes here is the common problem

Here is the most common cause of surges and stalls and low idle rough idle, it is the idle speed control air-bypass valve and throttle valve (IAC for short), they get full of gunk over the miles and cause idle issues (stalls, low idle) like yours, Get a can of intake cleaner from any local parts store, not carb spray, intake cleaner, it is made by a company called CRC, remove the air intake hose to the engine, hold the idle high so the engine won't stall, then spray the can of cleaner into the intake while keeping the engine running, use at least 1/2 the can, shut down the engine and disconnect the battery for 5 minutes, then restart and complete a number of mixed driving cycles, town, freeway, stop and go etc., after a few days the problem will go away as the system will relearn to the clean intake.

Posted on Feb 18, 2009

  • yadayada
    yadayada Feb 19, 2009

    U didn't say it was a diesel, sorry my fix does not apply to the diesel engine of any car, only gas.

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What is relearn predcudre for idle on 08 chev. 1500 5.3 eng.


Throttle Learn
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The engine control module (ECM) learns the airflow through the throttle body to ensure the correct idle. The learned airflow values are stored within the ECM. These values are learned to adjust for production variation and will continuously learn during the life of the vehicle to compensate for reduced airflow due to coking. Anytime the throttle body airflow rate changes, for example due to cleaning or replacing, the values must be relearned.
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