Skip the auto shop - Our mechanics make house calls

Q: A/c pulley bypassed Now it has a knocking sound but doesn't sound internal? timing was done at 180k

asked by on

I bought this car about 1000 miles ago. I know both previous owners. Car was well maintained.

My car has 207000 miles.
My car has an automatic transmission.

Hello there, a variety of faults will cause a knocking noise in the engine. The most common would be a belt tensioner, idler, engine rods, engine bearings, low oil pressure/level, power steering pump, or alternator. With so many possibilities the best bet would be to have a professional technician such as one from YourMechanic inspect the vehicle for engine noise and proceed from there.

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!
  • Home
  • Questions
  • A/c pulley bypassed Now it has a knocking sound but doesn't sound internal? timing was done at 180k

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: Lose of power when running, and the tac stopped working.

Hello. The vehicle likely stalled due to a lack of gas, or a poor air fuel mixture. This is what caused the drop in RPMs and for the tachometer gauge to drop. The first thing to do is turn the...

Q: No instrument lights when headlights are on

Hi there, Have you checked dash light rheostat on the dash that controls the dimmer for the dash lights. You may have accidentally moved the dimmer and this could totally dim the lights. If you still cannot get them bright,...

Q: AC not working

Hi there. The a/c compressor suction manifold hose may be defective and might be leaking where it seals on the compressor. The manufacturer has issued a technical bulletin to replace these leaking hoses, no matter the mileage, on the affected...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...
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.