Skip the auto shop - Our mechanics make house calls

Q: vehicle is stalking and suddenly changing its RPM

asked by on

I washed my car engine with engine cleaner in car wash and later after drying, it started with new problem of stalking engine and smoke. Engine used to run smooth and clean before the car wash and after, it started making weird noise and not picking up the accurate speed while giving the accelerator. and at particular point of speed it suddenly reducing its speed and sudden changes in the RPM.. Don't exactly recognize what to do.... . It got 3 codes in check engine light stating:
1. multiple cylinder misfire; 2. Crankshaft reference 18x circuit malfunctioning; 3. Low EGR flow detected; and suggested to Replace ignition coil. . I was thinking to replace crankshaft positioning sensor. My problem can be solved by replacing it? Please suggest me.. what to do?

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

Hi there. It sounds like there is water in a connector, such as the crankshaft position sensor. Before replacing this sensor, remove the connector and check for contamination. The contamination could be soapy water, oil, dirt, or any combination of water and something else. When this occurs, there could be an intermittent open or short occurring intermittently creating the erratic engine operation.Thoroughly clean with brake cleaner and dry the sensor and wire harness connector. Clear the codes and recheck the engine operation and codes. If the problem persists and the code returns, have a qualified technician perform an inspection to determine the specific cause of the concern and avoid replacing unnecessary parts. Your Mechanic has several available technicians that can assist you with a check engine light inspection.

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

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 won't start

Hi there. I believe the security light being on and the car not starting issue is one in the same. The FOB needs to be programmed to the ECU of your Pontiac. General Motors cars have a procedure for "relearning...

Q: I have white smoke coming from my tail pipe I also have to put water in my car about every 3 days what could the problem be

Hi there. Unfortunately, this appears to be a blown head gasket or significant coolant leak inside the motor. White smoke from the tail pipe is caused by coolant that is mixed with engine oil and is burned inside the combustion...

Q: My under carriage support is broken I was wondering how much will it cost to fix

Sent to CS

Related articles

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...
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.