krystar

The car drives and cruises fine. However, at wide open more than 4000rpm, a buttload of oil fumes comes into the cabin. I have replaced headgasket, new valves, new valve seals, new timing belt, new OPRV.

any ideas what could be the problem?

zoltan944

exhaust leak, probably at the headers

Marcquito

What model 944 do you have? It could be anywhere from a nasty exhaust leak to a boost leak (if you have the 951).

Stien

See quote in sig...







sry

krystar

it's a 83 NA. pretty sure it's not an exhaust leak...cause i don't hear it. if it is an exhaust leak, it's not at the head->exhaust manifold. the exh mani -> cat -> muffler is all checked.

krystar

lol stien, what u mean by loose zip tie....is that inside joke or for real?

Marcquito

It still possibly could be- or potentially bad gaskets? Who knows... on my 95 Mitsubishi GS-T I had a horrible leak that I couldn't find. I had even taken the exhaust off to give it a thorough check. All seemed fine, but I replaced the whole system anyway. The exhaust smell went away. There was definitely a small leak somewhere throughout that was not noticeable.

krystar

yea but this isn't a fuel fume or exhaust fume. i'm talking like blue smokescreen coming thru the hvac vents and also underneath the dash somewhere.

DJCarbine

Also leaves a nice smokescreen that is definatly burned oil behind the car, and comes in therough everywhere (hvac vents, shift boot, etc).

Its not just a little oil on the manifolds burning off, its like oil is being injected into the intake instead of fuel lol

Would a stuck open PCV valve cause this? Sucking in all the excess crankcase fumes and burning it all up at WOT?

Stien

Oh thats just a joke, I'll dig up the thread for ya:
https://rennlist.com/forums/showthre...hlight=zip+tie

Luis de Prat

How about the cam cover gasket? Only "oil fumes" that ever came into my 83 was when that sprung a leak right over exhaust header #1. Car was 14 years old and had 136.882 miles when that happened.

krystar

cam cover gasket was changed also. i wish i could put this thing on a dyno and just do a wot run and see where the oil's coming out.

krystar

bump

Luis de Prat

Then you may be looking at an oil pan gasket.

theiceman

don't need a dyno , take it to any shop , give a guy a 20 to put it on the hoist on his lunch hour and gun it , he will spot it immediately i bet.