Grand AM :: 2.4 Rough Idle When Engine Warms Up


Jan 29, 2012

2001 Grand am 2.4. Runs fine when the engine is cold but when it warms up the idle is rough. When throttle is added from idle, RPM's drop, it hesitates, then either stalls or goes. Car runs just fine when there is a load on the engine (highway speeds). Sometimes it will even stall coming onto off ramps off the freeway. It intermittently shifts hard. SES light is on p0108. Have replaced the MAP sensor and checked for vacuum leaks, still have the light and the same problems.

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I bought this from my brother in better than mint condition. Always maintained. Its generating a cyl #2 misfire code.

It starts and runs like new when cold, but when it warms up, it idles rough, and generates the code. after 1500 rpm it smooths right out and runs fine.

He had it to the dealer just before I bought it and they told him needed a new engine.

I am thinking bad injector, since what seems to be happening is, when cold it gets more fuel, or when u rev it gets more fuel, but at an idle and warm, it doesn't seem to be getting enough maybe. And I see from the maintenance records, a couple of other injectors have been replaced as well.

I think the dealer got tired of replacing injectors under warranty and tried to milk him for a new engine.

2002 ranger extended cab 2wd, 3 door, 232,000 kms 5 speed 3 liter V6, new glass and clutch..

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My farther works at a pull and save which is a lot to pull used parts from cars hes brought a used ignition coil, used boots , i bought new spark plugs and nothing was fixed there. we have replaced the maf sensor and the map sensor both with used parts neither fixed the problem. I am at my wits end here i cannot afford to take it to the shops around here and am trying to get this fixed to get back and forth to work. I may have left out parts that have been replaced, also as far as lights are concerned the check engine soon light is on .

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When you start the truck it rough idles but you have to hold the gas down til it warms up. You can shift into reverse but it labors the motor and the motor will not up the rpms kinda stays at idle and wants to die no matter how hard you accelerate and you can't move up a slight incline.

When you shift into drive you have to rev the motor to 3 grand an it will catch then move slowly forward. no matter how high the revs go. The fluid levels are a tad above the full level and a bit dark for my liking.

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