Skip the auto shop - Our mechanics make house calls

Q: High idle, loss of power, overheating

asked by on

My car has been idling high. While I'm driving, it seems to lose engine power and gets a bit overheated. However, the temperature gauge is showing normal operating temperature. I had the transmission fluid and coolant levels checked and they are at appropriate levels too. What should do to improve the way it runs?

A: Hello. Thanks for writing in about your 199...

Hello. Thanks for writing in about your 1994 GMC K1500 Suburban. A dirty throttle body will cause the power loss and RPM fluctuations. Also, a thermostat opening slow could be the cause of your overheating concern. This should be checked to see if the thermostat gauge is returning readings that are inaccurate. If you want to have this looked at, a certified professional from YourMechanic can come to your car’s location to diagnose your vehicle’s loss of power and overheating.

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 99gmc suburban backfires in the throttle body, won't start.

If you were getting a rattling noise in the lower front of the motor then you engine may have jumped timing. The timing chain may have been so worn that it jumped ignition timing between the crankshaft and camshaft. That...

Q: My vehicle is overheating.

If you have filled the coolant and it goes away without external leaks then you need to have the cooling system pressure tested to see if there is head gasket leaks inside the engine. If it is then you need...

Q: After repairs, SUV stalls after deceleration and idles

Using a scan tool to access any stored diagnostic trouble codes (DTCs) may give you some direction on this. I recommend cleaning the throttle body. TAC (throttle actuator control) or drive-by-wire throttles are very sensitive to dirty throttle bodies. You...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...