Skip the auto shop - Our mechanics make house calls

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?

A: Thank you for your question about your 2003...

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?

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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: Wondering

The wheel bearings on the front of your car are contained within bolt on, unitized "hub/bearing" assemblies. There is an assembly for the left side and one for the right so two altogether. The rear of your vehicle does NOT...

Q: When should I change the engine oil? What is the best oil type for winter and summer?

The engine oil used for summer is typically thicker. Thinner oil in the winter allows it to warm up quicker and lubricate sooner. Thicker oil will take longer to warm up and perform its duties. Your vehicle may only want...

Q: Why Do Diesel Engines Give Off so Much Smoke?

The smoke you see is made up of the visible particulates that are emitted as a normal part of the combustion process of a diesel engine. There are other non-visible emissions in the exhaust also, like nitrous oxide. Diesel fuel...

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...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...
How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...