Q: Smoking a lot and oil in the intake manifold

asked by on

I have a 203 jeep liberty 3'7 it has a lot of blue smoke when driving ..I thought bad rings or head gasket but when I tore it down i found a lot of oil in the manifold intake and oil around where the gasket where the manifold connects to the heads. what could this be?

Thank you for your question about your 2003 Jeep Liberty. An oily, water vapor laden mist continuously flows from the engine’s PCV valve to the intake. In some engines, a significant amount of the oil vapors will condense back into liquid once that vapor hits the relatively cold surfaces of the intake. In part, that is what you are observing. It is probably pure coincidence and has nothing to do with the oil burning you have also observed.

Replacing your valve stem oil seals should resolve, or at least lessen, the amount of oil getting into the combustion chambers. Although prior to doing that, just to be sure you don’t need to tear down the engine, perform a compression test on the cylinders to make sure the rings and valves are sealing. If compression is low or uneven, that’s not a good sign.

If you do have good compression and want to replace the valve stem oil seals, YourMechanic is ready to assist. One of our mobile technicians can come to you to perform these checks and properly diagnose the smoke and oil leak firsthand for an accurate repair.

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. Smoking a lot and oil in the intake manifold

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: Whining sound when accelerating half the time.

Hi there: Although it's possible that the whining noise might be caused by the overdrive, it's also possible that this noise is caused by bad or failing wheel bearings. As the wheel bearings begin to age, they will lose lubricity...

Q: Slow oil leak

Hi. A temporary engine oil drain plug is just that - temporary. I suggest you have your oil pan and drain plug repaired as soon as possible. As for your shaking, it sounds like your rotors are warped. Warped rotors...

Q: Smoke after warms up

Hello, thank you for writing in. Typically when the vehicle has blue smoke from the exhaust after warming up, it means that the engine is burning oil. This happens when oil leaks into the combustion chambers from a head gasket,...

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...
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...