Oil in the PCV and Map. and some stalling Help!

Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's, Olds 98 91-96, Buick Lesabres and Park Avenue 91-96. Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.
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97Prodigy
LE Member
Posts: 6
Joined: Sat Feb 22, 2014 8:18 pm
Year and Trim: 1997 Pontiac Bonneville SE

Oil in the PCV and Map. and some stalling Help!

Post by 97Prodigy »

Just went to change out the pcv and the map, and there was a lot of oil build up. Not to sure whats its from. Found a vacuum line disconnected at the front of the engine. But i doubt thats what it was.

The reason i was checking into it today is cause from a stop ill step on the gas and it would almost act like it would stall. Minor rpm fluctuation. but it would push right threw it.

Now with the new pcv and map it does not do that, however at start up it starts, drops to a low rpm. fluctuates and dies. Ill start it a second time and it will kind do it again but it power threw it, itll fluctuate around 500 to 1000 rpm then raising to around 2000 rpm/
Bob Dillon
Retired Gearhead
Retired Gearhead
Posts: 1854
Joined: Wed May 21, 2008 9:38 pm
Year and Trim: 1997 SE Anniversary Edition

Re: Oil in the PCV and Map. and some stalling Help!

Post by Bob Dillon »

You will find a small o-ring around the body of the PCV valve and another above it that seals the chamber above it. Take them to the local hardware store and get replacements. Also, check to make sure the PCV valve itself rattles when you shake it. The larger o-ring is 38 MM x 4 MM, unsure about the PCV, take it into the store and fit it up.

Make sure the cover on the PCV valve chamber o-ring seals tightly. When the cover is installed correctly, you'll feel a definite "click."

Your driveability problem is probably a vacuum leak caused by one (or both) of these o-rings leaking. Replacing them should get you back to normal.
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