Q: The car occasionally idles high until it stalls

asked by on

My car has occasional issues while high idling. Half the time I drive it, it would start having issues with increasing RPMs very high until it shuts off. The issue occurs usually during idling or when I stop at the traffic light for instance. The engine starts revving around 750 RPM and keep increasing it and finally stalls, or it would start idling as it should. When the issue happens, the restarting helps. I had the thermostat replaced. I checked fuel injectors. The dealer hooked it up to a scanner and said no error codes showed. What should I do? Thanks.

It sounds like this is an intermittent issue. These are generally the hardest to diagnose because they are just infrequent enough to not trip the ECU into triggering a code, but they still have a fault somewhere. The most common causes of a high idle include: a fault with the MAF sensor, a vacuum leak, or an idle air control fault. To confirm the faulty component, a technician will have to perform a full diagnosis and may need to use the scan tool to monitor various sensor data to locate the problem. A qualified technician like one from YourMechanic will be able to diagnose your high idle issue, and any other relevant problems, to determine what repairs are appropriate.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. The car occasionally idles high until it stalls

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Reduced power in reverse

Hi there. It sounds like you have a couple of different problems. If the vehicle does not have much power going into reverse, but the engine revs up fine then the transmission is slipping. Reverse is typically the first gear...

Q: How long do I keep repairing a nineteen year old car?

This is the most common question a mechanic will get. At 19 years and 175,000 miles, there is really no way to predict what may go wrong next. Burning one quart of oil every 500 miles is not uncommon for...

Q: Car stopped three times in one day

Hi. If the code is still present after both sensors have been replaced, and the engine is stalling, further diagnostics is needed. First of all, a new sensor doesn’t always mean a good sensor, especially aftermarket ones. Check the sensor...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...