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Topic
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My car, Honda cr v 2007 4WD automatic, engine R20A2. The idle drops when I stop at a red light or intersection. The rpm drops from about 700 to 550, but regulates itself quite quickly. But it drops so much that the car almost stops. With the AC on, it’s even worse. The whole car starts to shake and almost stops. At the workshop they said a few years ago when I was there with this problem that it is natural because it is a petrol engine. But I don’t buy it. It is not normal. The idle is too low! Possibly it gets worse when the weather is hot outside. The car has 15000 mil (90000 miles) on it. Normal idle for my car is 700, but it drops to 550-600 without AC, and with AC it drops to 500-550. When I drive hteres no problem, only when I have to stop.What does your experience tell you about this? What is the most likely cause?
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Yes, that idle range is too low. First step would be to check the throttle body condition and cleaning it. Idle and drive around for a while to let the ECU learn the idle. If it still continues then it could be your idle air control valve but before changing get it checked by a mechanic because there are other possibilities too like MAF sensor, TPS sensor, vacuum leak, etc.
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