Q: Police interceptor makes grinding sounds

asked by on

My car has 160,000 miles. Recently, I've noticed that buzzing and grinding sounds started coming from the Police Interceptor at RPMs around 3000. Also, when I am driving on the highway, there is a significant shudder during acceleration. This occurs only when the transmission is not in overdrive. The reason for that might be that I manually disabled the overdrive. It is either that or because it downshifts out of overdrive as I give enough gas. The transmission was rebuilt. Besides that, I changed oil cooler, condenser and transmission cooler because the transmission fluid was leaking. I cannot hear the sound when the car is parked or in neutral. This problem occurred suddenly. I did hear some quiet buzzing during driving last month, but this grinding sound occurred very recently and it could be heard occasionally.

The noise is coming from the internal transmission bearing or overriding clutches. Not all of these parts may have been replaced when the transmission was overhauled.

I can only recommend having a qualified transmission mechanic come and listen to the grinding noises and other problems you are having. Just the fact that you disabled the overdrive for the transmission could have caused undue stress to the transmission and should be fixed also.

Was this answer helpful?
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. Police interceptor makes grinding sounds

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: Grinding noise from tire

If the noise is constant, it may be the bearings. If the noise is only when braking, the noise may be brake related. Bearings typically make roaring/howling noises, while brakes typically make squeaking/grinding noises. A test drive and visual inspection...

Q: None of my power window will go up or down. And I just replace the power window relay

Check the 20 amp power window circuit breaker in the engine compartment fuse box. If the circuit breaker is sending power to the relay then the main power window switch will need to be checked to see if it is...

Q: Turn signals dont work and neither do the turn indicators on the dash

The most common cause of no turn signals is the multifunction switch not making connection and even melting the connector. Replace the multifunction switch and check the connector and replace it if it is melted.

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...
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...