Q: Knocking and rpm revving high

asked by on

My radiator fan was not coming on. I had a mechanic look at it and he said that he would re-wire the fan to the fuse box so that it could come on as soon as my car would start. But after he did this my car started revving to 4-5 rpm's and it would gain speed but it would take 10-15 seconds. On top of that when I tried to gain speed the engine started knocking after I would try to gain speed. Now when I start the car the engine would knock immediately and now when I push the gas the knocking becomes louder. When I returned the car to the mechanic he said I blew my engine because there was no oil but the day he rapaired my car he checked my oil and there was oil in the car. Do you think it's because there was no oil? Or could it be how he re-wired my car? Again the noise or revving with the high rpm didn't start until after he re-wired my car.

My car has 140472 miles.
My car has an automatic transmission.

Hi there. Unfortunately, without being there to physically inspect the vehicle, it’s hard to pinpoint the precise cause of the engine failure. However, one thing I can say without hesitation is that rewiring your vehicle’s cooling fan was not the correct solution to your radiator fan problem.

Anytime a mechanic assumes that they can bypass an issue by rewiring it or going against the manufacturer’s recommended service manual, they are risking damage to other mechanical components.

My best advice is to contact a different mechanic, perhaps a local ASE certified mechanic, who can inspect the root cause of your radiator fan issue, the unresponsive acceleration, and also any damage that was caused to your engine.

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. Knocking and rpm revving high

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 smoking under hood and spraying antifreeze everywhere, but not overheating

Hi, thanks for writing in. Either the bleeder screw was not properly tightened, or the bleeder screw (or worse yet possibly) the radiator is damaged and has begun leaking, and the fan is spraying the hot and high pressure coolant...

Q: I notice my car shakes a little when i accelerate from a full stop.

Hello. If the shudder only occurs slightly under acceleration then it typically is not a dangerous problem. Most of the time it is caused by a bad engine mount or an issue with a failing cv axle. If one of...

Q: Vibrating won't start

Although it would be difficult to tell exactly what the cause of the issue you are having is without taking a physical look at it, you can be almost certain that this issue is related to your recent clutch replacement...

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...
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...
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.