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Ok I cleaned egr new tps,new o2 sensors no vacuum leaks to b found and my idle still drops from 750 to 0 its a 96 Isuzu rodeo

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  • Isuzu Master
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You need to look at the IAC valve , idle air control ! This is what contorls the idle speed ! They get carbon build up on the valve pintal an on the seat an bore of the throttle body ! clean with carb cleaner !

Posted on Mar 29, 2015

  • Eric Hartwell
    Eric Hartwell Mar 29, 2015

    I cleaned it and even changed it out with another used one but neither of them made a difference think it might need new egr

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SOURCE: runs poorly(very Rich, stumbles) when map sensor

If it is fuel injected you may have a bad fuel pressure regulator. The regulator is attached to intake manifold with a vacuum hose and the bladder sometimes fails causing gas to be dumped directly into the intake manifold. Only solution is to replace the fuel pressure regulator.

Posted on Dec 10, 2010

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