Skip the auto shop - Our mechanics make house calls

Q: 2004 Chevy Express makes noise while idling

asked by on

2004 Chevy Express 1500 402,000 miles. It makes a moaning sound when idling and gets louder the higher the RPM is. Transmission shifts kind of hard. What do you recommend?

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, you’d want to pin-point where the noise is coming from inside there.

If you don’t have the equipment, call on a professional technician, such as one from YourMechanic. Depending on the situation they may put various mics on parts of the car and put on headphones on to listen to it with a receiver to see where the noises are coming from. If it isn’t the transmission, it’s probably going to need a rebuild. But you could try adding one quart of Lucas transmission fluid. That can sometimes help for a while. However, you’ll want to have the noise diagnosed if you want to find a long-term repair and prevent any further troubles.

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: car not starting

Hello! It is likely that you did drain your battery quite significantly when listening to the radio. There are some batteries that are unable to receive a charge again once they become very low. I suggest removing the battery and...

Q: engine revs up and down when in park

The idle is controlled by the idle air control valve and if it cannot keep the engine idling it will keep trying to rev the engine up to compensate. A vacuum leak, sensor that has failed, or an EGR system...

Q: Idling problems with my car, stays on but not for long.

A number of issues could cause the symptoms you're having. The problem could be attributed to everything from a failed alternator to a worn fuel pump. In this case, your best bet is to have the vehicle diagnosed by a...

Related articles

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...
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...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...