Originally Posted by BillBoost37
I've got one more trick... the elbow at the brake booster is a check valve. If it goes bad...you have a vacuum leak.
I'm stretching pretty far here, we gotta get this one soon.
And I wouldn't expect the smoke to get past the pcv checkball either. It'* in there to keep the crankcase from pulling air.
BillyBoosta, you just might be a Genius. I got smoke coming out that valve.
I smoked it again tonight. I checked the PCV valve and everything checks out. The pcv valve does flow in both directions, hence the smoke coming out the oil fille cap when removed. I verified this with anothetr new PCV valve.
I left the booster check valve connected to the hose but out of the grommet in the booster and at first nothing came out. However when I blew into it with my mouth, the smoke started pouring out when I released it from my mouth. The smoke slowly came down to just a trickle on it'* own. I also released the oil filler cap a few times to release the low pressure and each time the booster valve billowed lots of smoke and came down to a slow trickle. This seems to make perfect sense as the car stalls a lot now on decel when braking.
I still don't understand how all this started after the reseal, unless the reseal is allowing the engine to make a lot more vaccuum and now it'* very sensitive to it'* weakest link. So far since the egr tube replacement, I have done 4 short road trips up to temperature and no check engine light. One of the trips revealed a STFT of 0.0% and long term fuel trim a 16.3%. Another trip revealed 20% short term fuel trim with the long term still at 16.3%. The exhaust doesn't smell as bad either. I think I'm winning the battle.
I will pick up a new booster check valve tomorrow and have at it again.