Skip the auto shop - Our mechanics make house calls

Q: I have a hunting/high idle.

asked by on

The idle sits at about 2000 rpms with the tps unplugged. If i plug it in the idle will surge from 1k to 2k constantly. The issue is only while in neutral, as far as i know i do not have any vacuum leaks. Unplugging the iacv causes the idle to drop to about 1500, i believe the iacv is in working condition. The map sensor has been changed twice but it could be bad, i do not know how to test that. I have tried a lot of little things to fix the idle as its my daily vehicle and i cant dive into something unless i know itll fix it. Any help would be appreciated

My car has 212000 miles.
My car has a manual transmission.

Hello. An irregular idle can be caused by many things. If the idle speed appears to stabilize with the throttle position sensor then it may be possible that the throttle position sensor is the source of the issue. The MAP sensor is another possibility, though unlikely if it has already been replaced twice. A voltage or resistance test would be able to determine if the component is functioning correctly. A few other things to look at would be fuel system, ignition system, and the engine management systems. An issue with one or more of the components to any of these systems, such as a fuel pump, injectors, or vital engine sensor, may result in an unstable idle due to the fact that the computer receives its commands for idle speed from the engine management system. It may also be possible that the idle air control valve itself is the source of the issue. If you are unsure, I would recommend having a professional technician, such as one from YourMechanic, come to your location to diagnose what may be causing your irregular idle.

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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: My car keeps dieing at stop lights

This may be a result of a dirty or failing idle air control valve. The idle air control valve reads the air intake as it is mixed with fuel prior to being injected into the engine at low speeds and...

Q: Am I looking at the right thing for my car?

Hello. My research indicates that those should be the correct replacement shocks, as long as the vehicle is not a Civic SI. These shocks will fit both the sedan and coupe versions of that year's Civic, however they will not...

Q: Screeching noise at low rpm possibly from intake manifold

It is possible that this noise could be coming from the internal parts of the engine. It is unlikely for an intake manifold to make noise as there are normally no moving parts associated with it. I would recommend checking...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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...