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.

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

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: Engine surges when stopped in traffic, high RPMs

Hi there. I do not have any information on this problem of the engine accelerating on its own. If the dealer has not duplicated the issue, then leave it for and extended test drive or duplicate it for them with...

Q: Had valve job done on my 2010 Nissan Titan and head gasket and valve cover gasket replaced, truck still puffs could of smoke

If you have not already done so, replace the PCV valve. You should have the engine compression tested to see if any one cylinder is low on compression. The cause of white smoke that is not just condensation in the...

Q: Vehicle rumbling at low speeds

The rumbling at low speeds may be coming from a tire. The squealing noise at full turn is most likely a serpentine belt for your power steering pump that needs to be adjusted or replaced. The sagging rear suspension could...

Related articles

What Causes Hoses to Leak?
While the largest part of your engine is mechanical, hydraulics plays a significant role. You’ll find fluids at work in a number of different areas. Your car's fluids include: Engine oil Transmission...
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...
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...