Skip the auto shop - Our mechanics make house calls

Q: Idle speed too high.

asked by on

Once the engine warms up, the engine speed some times goes to 1200 to 1500 RPM at idle. Tapping the accelerator will some times bring it back to 800 RPM. Thought the AC might have been the problem, But, I'm now convinced that may not be the problem.

My car has 133000 miles.
My car has a manual transmission.

Hi, thank for your question. If the AC is coming on but the compressor is not engaging, then it could cause a higher idle than normal. The throttle position sensor and idle control valve need to be tested with a scanner to see if the TPS is set correctly and the idle control valve is sticking open from carbon deposits. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect this idling issue for you, and make or suggest any repairs as needed.

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: Humming noise from little box located in lower left corner of engine closest to headlight.

Hello. From your explanation it sounds like you are taking about the ballast resistor for the headlamp. This is what powers the headlamp and when it begins to fail it will make a noise such as this. If you want...

Q: Problem of my Ford ranger tdci 3.0L

Check for spark while the engine is hot and not wanting to start. If the coil pack has any cracks, they can spread when the engine is warm and cause a short to ground. Consider hiring an experienced technician to...

Q: How do I use the bed divider?

The bed divider can keep small items in place in the bed of your truck. These items can be up to 400 pounds. To use the bed divider. Lift the handles on both sides of the bed divider and...

Related articles

P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...