Oil getting into combustion chamber (Page 1/3)
PontiacLT1 FEB 15, 01:00 PM
85 Fiero GT, stock 2.8L v6, 4 spd. man.

So recently I bought new fuel injectors due to my engine having hard starts and sporadic idle. After I changed my injectors I was elated when my fiero started first try, and was running amazing, until I got out of it. I noticed tons of white smoke exiting the tailpipe, but it was not antifreeze it was oil. the wall behind it actually had liquid oil splattered on it and the barn was filled with smoke. Trying to research this was nearly impossible, so I instinctively threw money at the problem, more expensive injectors, as I had heard that might be the issue and even bought the metal vacuum lines from the fiero store, and new pcv valve. Well had the same issue, and i'm pretty sure now a vacuum leak. last option was to just beef the viscosity of the oil, so I put in conventional high mileage 10w-30 in.... and all that did was change the smell of the smoke. So i'm bummed and have a feeling it is an internal issue. I have good compression on all cylinders, so would there still be good compression if one of the o-rings are shot. Or anything else that somehow may be letting oil in...Valves?.... I'm looking for anything at this point. The car is a project that sat for some time before I bought it, if that adds to the possibility of something.

Thank you
thesameguy FEB 15, 01:52 PM
The typical way oil gets into the combustion chambers is via the head... so you've probably either got leaky valve stem seals or worn valve guides. Or both. Eh, it could be excessive blow-by sending liquid oil into the PCV system.

When does the problem occur? Cold startup, hot startup, after it's been running, all the time?

[This message has been edited by thesameguy (edited 02-15-2021).]

PontiacLT1 FEB 15, 01:59 PM

quote
Originally posted by thesameguy:

When does the problem occur? Cold startup, hot startup, after it's been running, all the time?




All the time. On startup it usually will be not that bad when first started, but within seconds, it just starts to billow. I can also let it run for minutes and it just keeps pumping out smoke.
thesameguy FEB 15, 02:14 PM
Are you certain the oil isn't overfilled? Does the problem clear up after a gentle drive?
skywurz FEB 15, 02:16 PM
How many miles on the engine?
PontiacLT1 FEB 15, 02:39 PM

quote
Originally posted by thesameguy:

Are you certain the oil isn't overfilled? Does the problem clear up after a gentle drive?



I don't think it is as it didn't smoke prior to changing the injectors, it just had a really bad idle. After I changed the injectors it started happening, and I didn't mess with the oil when doing the injector change. I have not tried driving it as I wanted to get it running good before I got it registered, but I could always try to move it around the block.
PontiacLT1 FEB 15, 02:40 PM

quote
Originally posted by skywurz:

How many miles on the engine?



It has 113, 533.

So it is considered high mileage, but not high enough where I would want to do a full rebuild.
thesameguy FEB 15, 02:49 PM
Check the oil.... I mean, do that first. No point speculating if it's just overfilled. What's the coolant level like?

[This message has been edited by thesameguy (edited 02-15-2021).]

cvxjet FEB 15, 03:38 PM
This sounds to me like something that must have happened when you were changing the injectors- Go over everything you did and look at which hoses/pipes go where......

[This message has been edited by cvxjet (edited 02-15-2021).]

skywurz FEB 15, 04:15 PM
I dont remember exactly but i swear i read something about if the PVC system gets clogged it can force oil into the intake. or something to the gist of that.