Skip the auto shop - Our mechanics make house calls

Q: I DROVE THRU A FLOOD & MY CAR STALLED. NOW THAT IT STARTS ITS KNOCKING... WHAT CAN BE CAUSING THIS?

asked by on

A FLOOD & MY CAR STALLED. NOW THAT IT STARTS ITS KNOCKING... WHAT CAN BE CAUSING THIS?

My car has 78000 miles.

If you drove through deep water, chances are your engine took in some water and did internal damage to it. When engine suck in water, they cannot compress the water that gets into the cylinder, so it usually locks up the motor or causes a connecting rod to bend or break. It also could have damaged the engine bearings, which will also make a loud knocking noise. I would have the problem professionally diagnosed, and I would have it done soon. If the engine was in fact damaged, you will need to have it replaced or rebuilt, and it can be very expensive. You can contact a qualified professional, such as one from YourMechanic, diagnose the noise at your home or office. In the future, never drive through deep puddles or standing water. If you have no choice, then slow down to about 5 mph and coast very slowly through it, do not step on the accelerator any more than you have to, as that would allow more water to be sucked in.

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
  • Home
  • Questions
  • I DROVE THRU A FLOOD & MY CAR STALLED. NOW THAT IT STARTS ITS KNOCKING... WHAT CAN BE CAUSING THIS?

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: Why does the side of my radiator back flow container say 4 cycle gas...

The part is designed for a gasoline 4 cycle motor and not the Diesel 4 cycle motor.

Q: Car making grinding noise.

The water pump is the most common part changed on this motor and year. The noise once heard could be isolated to the water pump or a tensioner pulley. I recommend to have the system checked by a qualified mechanic....

Q: A "No Buss" signal appeared on the dash of my 2006 Dodge Stratus

Hi there. Your vehicle has lost the communication buss; the line that all the computers communicate on. This buss originates in the body computer in most dodge vehicles of this year. Check all fuses, including the fusible links in the...

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...
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...