I have a smoking problem that I'm trying to diagnose. My engine smokes on occasion when I crank it up. Big embarassing puff, then stops. I've also been told that it puffs slightly each time I shift from someone driving behind be, but not enough for me to see in the mirror.
Thoughts are: valve guides/seals, PCV, or intake leak. The heads (Trick Flow Twisted Wedge) had new bronze guides and seals intalled less than a year ago to try and fix this problem, so hate to think its them. Changed the intake gasket recently, but smoked before and after, so don't think that is the problem. The rubber hose between the PCV valve and intake had oil in it, so I assumed that was the problem. I replaced it, but the engine still smoked as before. Just to make sure the PCV valve wasn't the source of the problem, I disconnected it and plugged the port at the intake. Still smokes.
So I'm back to suspecting the valve seals or guides. It smoked before I had them replaced, and I thought that would solve the problem but it didn't. I hate to think the shop that did them screwed them up, but it is very possible. They put two spring seat cups under one valve spring and none under another that caused the spring to bind and pull the rocker arm stud out. I helicoiled the stud and corrected the seat cup problem myself. So they've already screwed up once. But I hate to accuse them of screwing up the guide or seals without reasonable proof.
So, how can I prove to myself that the guides or seals are the problem? I've inspected them visually, and see no obvious problems. Is there anything else I can do to confirm where the smoke is coming from. Is there anyway to confirm it's not the intake leaking? I'm certain its oil, as I have no leaks but keep having to add oil. And I don't lose any coolant.
Again, its smokes a big puff sometimes when I crank it, but not every time. And it smokes a small puff when I shift.
And yes, I know it sounds like guides or seals. But I want to know if there is anyway to confirm this without pulling the heads, before I accuse the head shop of screwing up.
Thanks for any ideas,
68 SS Convertible
383 w/DFI Fuel Injection
on MiniRamII intake,
Trick Flow heads
Tremec 5 sp, 3.31 12bolt Posi
AGR 12:1 power steering
Bent short steering arms
Baer 13" front brakes (Couldn't find time to make my on bracket)
550# Hypercoils with Landrum height adjusters