smoking truck?

Question

My truck smokes when i start it. It will smoke for about 30 seconds then it stops. what could be wrong with it? Its a 1986 chevy pickup.

Answer 1

Chevy V8 engines are mounted so the rear of the engine is lower that the front. When you shut the engine off, the oil flows on top of the heads to the back two cylinders, where it leaks past the intake valve seals since they are worn out.

If you remove the rear cylinder sparkplugs, they will be oil fouled, with crusty black baked oil on them.

Answer 2

I don't think you really have a problem. The smoke could come from several sources, and I don't think any of them are too much of a problem since the smoke goes away in a short time.

You could have condensation building up inside of your exhaust system. And when the motor fires up and gets warm, so do the exhaust pipes. It's probably just steam burning off from the condensation.

If you have a 1986 truck, chances are you could have a slight bit of clearance between the cylinder walls and the piston rings. This would allow some oil to seep between the cylinder walls and rings. That is what's called, "blow-by". But if you're not experiencing any oil smoke constantly, I don't think your rings are that worn, or your cylinder walls either, but maybe just have enough wear for some oil to get by. Once the motor gets hot, that oil is going to burn off. And that's probably what you're seeing.

If you had a cracked block or intake manifold, you would have white smoke coming out of your exhaust constantly. So I don't think that's the problem in this case.

Best wishes.

Answer 3

Get a Haynes Repair Manual at the local Auto Zone or auto parts store in your area. It will troubleshoot and show you how to fix your vehicle. Also on the Auto Zone site has a section for vehicle maintenance

Didn't know what type of truck but then the problems are all the same source.
http://www.autozone.com/servlet/UiBroker?UseCase=S001&UserAction=viewSimpleDiagInfo&Parameters=info





Priority Action Part Type Cause
1 Inspect Exhaust System Damaged or restricted exhaust system components.
2 Inspect Valve Stem Seal Cracked or brittle valve stem seals allowing oil to enter combustion chamber.
3 Inspect Head Gasket - Performance Head gasket leaking coolant into cylinders

Answer 4

purchase a "NO SMOKING" signal and fix it below the hood! heavily even if, what type of truck is this???? even if it really is a GM automobile than you've gotten the DEXCOOL predicament situation. maximum SMOKING comes from mistaken ENGINE TUNING and detrimental oil options. the biggest situation stems from a unclean IDLE AIR administration VALVE> this element effective tunes the AIR area of injection, no longer something cleans it yet guide interest!. detrimental AIR/gasoline ixture will skinny down the oil till it has NO selection yet to BURN andcause SMOKE! Many GM engines burn COOLANT even as their intake GASKETS dissolve via the years. WHAT do you've right here!??!?!

Answer 5

My guess would be worn valve guides. this allows oil to drip in on the cylinder head.. Its nothing serious right now but need to be rapaired in the future. Look its what 20 years old.. seals wear out and besides its a chevy

Answer 6

It could be condensation within the exhaust system. Especially during winter months this will happen when you start your truck.