Skip the auto shop - Our mechanics make house calls

Q: Pcv valve problem

asked by on

I have a 2002 ram 1500 4x4 4.7l, i changed the pcv valve and pcv tubes because im burning alot of oil, after i changed the parts i had a check engine light come on, evap medium leak, so i checked the lines again to make sure all were good, the pcv valve rattles at idle then stops when increase in RPM but then when back to an idle it does not rattle, if i rev it while the pcv valve is not rattling white smoke comes from the top of the motor, not sure where to look next.

My car has 335000 miles.
My car has an automatic transmission.

A: Hello. In most case a PCV valve should not...

Hello. In most case a PCV valve should not noticeably rattle, though that varies from engine to engine. If it appears to be rattling excessively that could signify that the PCV valve is not secured properly, that there is a vacuum leak, or that the internal spring is weak or broken, and that the valve needs to be replaced.. An excessively rattling PCV valve could cause an unstable idle, hesitation, and oil consumption. A code for the EVAP system will usually be a separate issue from that of the PCV valve. If the code came on after working on the PCV valve, I would carefully check to see if there are any vacuum hoses or emissions hardlines that run near the PCV valve to see if they may be damaged or broken. If not, it may be possible that the EVAP leak is elsewhere. I would recommend having a professional technician, such as one from YourMechanic, come to your location to determine the cause of the PCV valve rattling, and if it may be related to the trouble code.

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・Save up to 30%

Get a quote

What others are asking

Q: Misfire in the 4/5 fuel injectors

Hi there. If the engine code is showing that you're experiencing a fuel injector misfire, it's most likely not related to the fuel pump. Most of the time, this is a fuel injector sensor or connection malfunction that triggers this...

Q: Truck won't start; P0882 code

Hello. The P0882 diagnostic trouble code is an indication that there is an issue with the transmission control module power input signal, which is not likely to prevent the truck from starting. It is more likely that you have a...

Q: My alternator was just replaced. Now it's whining and locking on me! Why?

Check the transmission output shaft housing and make sure that it is not cracked or damaged. The vehicle speed sensor is located in the output shaft housing and controls the speedometer. If the housing is binding with the output shaft,...

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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
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...