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Intermittent idle drop RésoluRésolu

Chevrolet Malibu 2009 2.4 150000 km
The car will sometimes drop the idle for a moment while driving or at idle. While driving, you can feel a noticeable change in engine speed and also see a visual drop in RPMs. Same at idle. Condition is worse when outside temp is over 80 but will do it even when cold outside. Have replaced and plugs, wires, throttle body, MAF and and other sensors that might control idle. Have reset the ECU every time I change something, just to be sure it relearns what changed. Has been happening for the past 2 years and it never gets worse. It also never triggers a CEL or code. Just an annoying problem th… Lire en entier
CarDad2025 de États-Unis il y a un an  
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Deemo de États-Unis il y a un an
Had same issue, change tcu. Drain off ecm the let idle for 15 m before driving
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CarDad2025 de États-Unis il y a un an
The issue turned out to be a bad fuel injector on #1. Would never throw a code but had to drive the car for a long trip and it finally threw a code and led me to the issue. New injector solved the problem.
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