94 full size blazer 5.7 using oil and burning through exhaust

[Bamabreeze]

Hello and Thanks for the add..my situation is my 94 full size blazer has started using oil and it smokes pretty good on first start up with a mixture of burning oil/gas smell..can anyone help identify the problem..and does anyone recommend using Blue devil for the fix..thanks in advance

 

[ZooMad75]

Hello and Thanks for the add..my situation is my 94 full size blazer has started using oil and it smokes pretty good on first start up with a mixture of burning oil/gas smell..can anyone help identify the problem..and does anyone recommend using Blue devil for the fix..thanks in advance

Older high mileage small blocks are pretty well known for smoke on initial cold start. The question really comes down to how much oil is it using? The typical smoke on startup is normally coming from the valve guide seals. It goes away with the warm-up. If the smoke and smell continue after warm-up you got a bigger problem.

How much the engine is burning oil is important to know too. Using a quart between changing the oil out is one thing, needing to add a quart every other fuel fill-up is extreme.

I'd pull the spark plugs to see the full extent of the problem. A cylinder burning oil will have the spark plug wet and black with some crusty deposits on them. It might be one cylinder or multiple. It's good to know which ones are using oil.

 

[Bamabreeze]

Older high mileage small blocks are pretty well known for smoke on initial cold start. The question really comes down to how much oil is it using? The typical smoke on startup is normally coming from the valve guide seals. It goes away with the warm-up. If the smoke and smell continue after warm-up you got a bigger problem.

How much the engine is burning oil is important to know too. Using a quart between changing the oil out is one thing, needing to add a quart every other fuel fill-up is extreme.

I'd pull the spark plugs to see the full extent of the problem. A cylinder burning oil will have the spark plug wet and black with some crusty deposits on them. It might be one cylinder or multiple. It's good to know which ones are using oil.

Ok.. thank you for the info. I'll try to take a look at it tomorrow to determine if any plugs look bad.

 

[nvrenuf]

@Bamabreeze welcome! What part of the state? I’m down at the bottom.

 

[Bamabreeze]

@Bamabreeze welcome! What part of the state? I’m down at the bottom.

Eastern part of the state...good to see someone else from AL..

 

[scouthead]

Older high mileage small blocks are pretty well known for smoke on initial cold start. The question really comes down to how much oil is it using? The typical smoke on startup is normally coming from the valve guide seals. It goes away with the warm-up. If the smoke and smell continue after warm-up you got a bigger problem.

How much the engine is burning oil is important to know too. Using a quart between changing the oil out is one thing, needing to add a quart every other fuel fill-up is extreme.

I'd pull the spark plugs to see the full extent of the problem. A cylinder burning oil will have the spark plug wet and black with some crusty deposits on them. It might be one cylinder or multiple. It's good to know which ones are using oil.

If this is on start up and gets better as the engine warms up- valve stem seals. Ive fixed this on 3 separate gm vehicles with the LO5 without pulling the motor. Little bit of oil runs down the valve stem while the truck is parked, and burns off when you start it. go get the tool that connects to the air compressor and threads into your spark plug hole, and also a good spring compressor. seals are cheap. takes most of the day to spin the motor going from TDC on each cylinder pulling and replacing. be careful not to drop a valve into cylinder with a piston thats @bdc. that would suck... with the piston up, probably wouldn't loose it, but Ive not had a problem when using the air tool- keeps the cylinder pressurized, and the valves stay in place really well.

if burning oil while running, PCV valve is easy to check. other than that, compression check and the usual stuff- make sure there's no water in the oil and vice versa?

Ive had a few of the EGR intake manifold passages blocked with oil and carbon, but that was probably a result of the oil burning, not a cause

 

[Bamabreeze]

If this is on start up and gets better as the engine warms up- valve stem seals. Ive fixed this on 3 separate gm vehicles with the LO5 without pulling the motor. Little bit of oil runs down the valve stem while the truck is parked, and burns off when you start it. go get the tool that connects to the air compressor and threads into your spark plug hole, and also a good spring compressor. seals are cheap. takes most of the day to spin the motor going from TDC on each cylinder pulling and replacing. be careful not to drop a valve into cylinder with a piston thats @bdc. that would suck... with the piston up, probably wouldn't loose it, but Ive not had a problem when using the air tool- keeps the cylinder pressurized, and the valves stay in place really well.

if burning oil while running, PCV valve is easy to check. other than that, compression check and the usual stuff- make sure there's no water in the oil and vice versa?

Ive had a few of the EGR intake manifold passages blocked with oil and carbon, but that was probably a result of the oil burning, not a cause

Thanks a million for the info!!..I've got a certified mechanic coming Saturday to run some test and look over it to see what can find out...for some reason he thinks it might be my throttle body needing to be rebuilt..he thinks the diaphragm is bad or it's an injector going out in one side and the other injector is overloading the intake with to much gas and causing it to burn through the exhaust..says it will smoke and kinda smell like gas/oil burning..I'm hoping it's nothing to major and can resolve the problem

 

[Bamabreeze]

@Bamabreeze welcome! What part of the state? I’m down at the bottom.

Central

 

[Wes Harden]

The injector is plausible. This is a vortex engine, I'm guessing. They had an issue with the injector, the is an updated part to solve the stuck injector poppet problems.
You'll want to keep a distributor cap and rotor on hand, these parts don't last long, replace when you feel the engine miss firing

 

[imiceman44]

The injector is plausible. This is a vortex engine, I'm guessing. They had an issue with the injector, the is an updated part to solve the stuck injector poppet problems.
You'll want to keep a distributor cap and rotor on hand, these parts don't last long, replace when you feel the engine miss firing

94 would still be tbi.
96 was first year vortec.

 

[Bamabreeze]

Well with I think I've fixed the problem..with a complete throttle body rebuild kit and a good cleaning,new injectors,new fuel filter and plugs it seems to be running fine..no smoke from exhaust and the oil level is good..thanks a million to everyone for there shared knowledge..happy trails