Skip the auto shop - Our mechanics make house calls

Q: Knocking sound when idling or stopped 1993 Chevrolet Lumina APV

asked by on

There is a rhythmic knocking sound coming from the left side of the engine (facing the engine from the front) near the serpentine belt. On the road you can't really hear it, it gets really loud when idling at a light. Then in park and running it's still there just not as loud.

My car has 230000 miles.
My car has an automatic transmission.

Hello - the rhythmic knocking you hear could be something driven by the serpentine belt (i.e. AC compressor) or the belt itself. It is also possible that this an internal noise - like the timing chain, which is immediately behind the serpentine belt on the engine. Removing the serpentine belt, then starting the engine for 20-30 seconds won’t harm the engine, but would narrow the problem to inside the engine or something belt-driven. I would recommend getting this checked out soon, as additional damage may be occurring while you drive further. A mobile, professional mechanic, such as one from YourMechanic, will come to your location, diagnose this problem, give you an accurate assessment of damage and cost estimate for repairs.

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
  1. Home
  2. Questions
  3. Knocking sound when idling or stopped 1993 Chevrolet Lumina APV

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 2015 Chevrolet Tahoe was running fine i added oil and when i turned the car on later that day it started shaking what could it be?

Hello. This would usually only occur if you added to much oil or used the wrong weight oil. This engine needs the correct oil in order for the valve timing system to work right. It sounds like the vehicle should...

Q: Pressure valve cover rings

The pressure you are observing is not a good thing. First off, check to see if the positive crankcase ventilation valve (PCV valve) is clogged up. If it is, then it should be replaced. Also check to see if the...

Q: Had my truck serviced, was told the issue was a knock sensor. One day later the same issue occurs with the reduced engine. 2008 Chevy Silverado 1500

Hello - your engine has 2 knock sensors. The failure of one or both of them was recognized by engine management, and power is reduced in order to avoid engine damage. I would recommend knock sensor replacement - times 2,...

Related articles

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...
How Much Does a Mechanic Make in Vermont?
Automotive technician jobs in Vermont have an average mechanic salary of $37k, with some mechanics earning a salary of $53k.