Skip the auto shop - Our mechanics make house calls

Q: Rough idling - 1990 Chevrolet G30

asked by on

My van overheated one time. After that, it started to idle rough. This occurs in reverse, park and drive when the engine is still cold. When the engine warms up, there would still be rough idling but only in reverse and drive, whereas it's fine in neutral or park. The van has no trouble accelerating. I checked the tailpipe and there is no resiude or moisture. The oil and coolant are looking good and aren't mixed. The spark plugs are fine as well. What should I do?

A: This could be an issue with a blown head ga...

This could be an issue with a blown head gasket. This would require a professional mechanic to check engine compression as well. This can occur without causing oil/coolant mixing. If you are still having trouble, a certified technician from YourMechanic can come to your home or office to definitively diagnose the rough idling issue.

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Transmission problem

Hi there, thanks for writing in about your 2000 Dodge Ram 1500. If you are not low on transmission fluid, then you may have possible internal transmission issues that may require a transmission overhaul. If you want to have this...

Q: Car doesn't turn over. Replaced spark plugs and wires.

I would have a technician inspect your starting problem because it could be a number of things that would stop the car from starting.

Q: Sequaling noise on light acceleration when the engine is warm

You should have the serpentine belt and belt tensioner checked and replaced as a set if it is the cause of the squeal. This is the most common cause of squealing. If you would like, a certified technician from YourMechanic...

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...
How Long Does a Distributor O Ring Last?
The distributor is part of the ignition system in your vehicle and its purpose is to route high voltage from the ignition coil to the spark plug. The spark plug then...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.