1985 2.3l fuel injection burning oil

[toby'87xlt]

Problem - truck is burning oil. Heavy blue smoke out the tail pipe so its burning it obviously. HOWEVER it is only burning oil once the motor starts to get heat in it. On a cold start there is no blue smoke for a solid couple minutes. Once you rev it up and it starts getting warm it starts blowing blue smoke.

Why is it doing that once warmed up? Makes me not suspect valve guide seals. Any ideas? If anything it should be worse once it is warm and not cold right? Any help would be awesome! It supposedly has 248k miles on it but it runs smooth and isn't making any abnormal engine noise.

 

[RonD]

Welcome to TRS

Change PCV valve and check its hose for oil residue

Also after warm up with engine idling, pull out the PCV Valve to see how much blow-by is coming out the valve cover hole, if its alot then rings are shot

Oil gets thinner when warmed up so can pass by valve guide seals easier, so could be seals

 

[sgtsandman]

If those check out to be fine, it could be a head gasket problem where the gasket is allowing oil into the engine cylinder(s). Go easiest and cheapest to more expensive, one at a time. If it ends up being a cylinder ring problem, the head will need to come off to fix the issue anyway.