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?

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 1,000 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
  1. Home
  2. Questions
  3. High idle, loss of power, overheating

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: 99 GMC SUBURBAN running lean and starving for fuel when stompped on.

Hi there. Is there a check engine light on? If so, what are the codes, freeze frame data? Stored codes and data will aid in diagnosing what is occurring. What does the data look like from the O2 sensors? Which...

Q: Car overheats, heater malfunction

I'm not real clear yet on what is going on with your Mazda. Let's start with the diagnosdtic trouble code (DTC) that indicated a faulty Engine Coolant Temperature sensor. That needs to be replaced. Next thing: you may want to...

Q: 2004 Chevy Express makes noise while idling

The first thing you'd want to check is the power steering. A lot of times, they groan on those. If it's not the power steering, a lot of times it would be the transmission. If it's coming from the transmission,...

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...
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...
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...