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Engine does not idle consistently.

Sometimes it is very high ~1500 RPM sometime won't even idle. Have checked the TPS, replaced the idle air adjuster, and replaced all the vacuum lines. I get an inconsistent error code on the ECM (32) which has to do with the EGR system

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  • Doug Jan 07, 2013

    I believe I placed that in the make and model information section. It is a 1993 Isuzu Trooper 3.2L LS. I have tested the ERG and the valve seems to work fine.

  • Doug Jan 07, 2013

    I just hate to start replacing things without knowing for sure they are faulty.

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  • Cars & Trucks Master
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You don't say what the make model and year is, but a faulty EGR valve could cause the problem you describe. If the EGR sticks open you would have a large vac leak.

Posted on Jan 07, 2013

  •  Stephen
    Stephen Jan 07, 2013

    Well if you are getting a code for the egr valve, the computer is having a problem with either the valve or the control for the valve. I would take another look at it. You could also have a vac leak somewhere that is affecting the EGR system and also causing the idle problem. It could be affected by engine temp.

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COULD BE A VACUUM LEAK TAKE PROPANE TORCH AND LEAVE OFF PUT AROUND ALL VACUUM POINT WHERE YOU SUSPECT COULD POSSIBLY LEAK ENGINE SPEEDS UP THAT'S IT WORTH A SHOT BEFORE SPENDING MORE CASH

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Wow you have replaced a lot of stuff. Lets go back to the Fuel pump. When you replaced it did you replace the hose between the pump and the sending unit. These are common for splitting. Have you hooked up a fuel pressure gauge to check what pressure you have? It should be real close to 13 psi and should raise to at least 18 or 19 when you pinch off the return line.

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SOURCE: car won,t start sometimes & check engine light

before changing any more parts there are grounds on the engine that need cleaned one on the back of intake manifold then you have to remove battery tray clean up the ground there then clean where the tray bolts up as this aids in chassis grounding remove ground cable from bellhousing before you reassemble install star washers btween cable ends and where they bolt up this will dig into ground surface and cables making a better ground then remove turn signals in front there are two on right side and one on left side cleanup and star washer then there is the ground spots for the ecm inside removr kick panel on right side clean up and star washer if the starter doesnt work after this starter is probably bad but the other codes will probably clear out

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