Skip the auto shop - Our mechanics make house calls

Q: White smoke from exhaust and car rumbling while stopped or idling.

asked by on

The engine rumbles randomly while idling or stopped at a light. This happens around 700 RPMs where it fluctuates up and down on the RPM meter. At this point, the engine makes a rumbling noise. All of the spark plugs were just replaced and one of the ignition coils, due to a crack. I also have white smoke coming from my exhaust, which I think is associated with the crankcase oil separator valve.

A: It sounds like you may be getting oil into ...

It sounds like you may be getting oil into the combustion chambers of your engine causing it to burn off in the exhaust. This is the white smoke you see. This may also be related to your idle issue as well because a burning oil explosion and a burning gasoline explosion will cause the engine to react differently. If oil gets into the combustion chambers for too long the spark plugs may be fouled out by the oil and require replacement again. If the crankcase oil separator valve is the part you suspect, I would recommend having a professional, such as one from YourMechanic, come to inspect that part and any others related to it. A repair of your problem can ensue once a few parts have been inspected for faults.

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: cylinder number 4 has a misfire.

Billing question sent to CS for the cost to diagnose and repair a possible burned valve on a 2008 Jeep Commander with a V6-3.7L engine.

Q: Power window won't go up

Hi. It is most likely that the window regulator is bad or the window came off the track. I recommend you have a mechanic like one from YourMechanic visually inspect your window to see which is the failed component.

Q: Transmission problem

The pop could have come from a cooler line or a bad seal somewhere underneath the car. A further inspection of the leak will be necessary to see exactly where from and what fluid is leaking. Consider hiring one of...

Related articles

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...
What are the Car Pool Rules in Hawaii?
Hawaii is widely regarded as a land of vacation and relaxation, and as such, its scenic roads and routes are far better known than the state’s freeways. But, as with all...
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.