pcv valve - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 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 and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 12-12-2004, 05:53 PM   #1
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Default pcv valve

How can I cheak to see if my pcv valve bad. My car runs fine but has poor gass mileage.
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Old 12-12-2004, 05:58 PM   #2
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I'd look at the FPR first. Pull the vacuum hose off with the engine running and look for fuel leaking out of the nipple. There should be none.
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Old 12-12-2004, 08:43 PM   #3
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Where is the FPR.
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Old 12-12-2004, 10:11 PM   #4
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On the fuel rail (firewall side).
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Old 12-12-2004, 11:21 PM   #5
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The PCV should rattle when you shake it. But if it hasn't been changed in awhile, I would just replace it once you get the old one out. Also, when was the last time you changed the O2 Sensor?
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Old 12-14-2004, 05:51 PM   #6
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I'm having the same problem with my car. The car now runs good because I changed the crankshaft sensor but it is poor on gas. I was told that my O2 sensor is bad too.

My questions is, does bad O2 sensor the reason for poor on gas?

Also, how do you change the O2 sensor?
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Old 12-14-2004, 08:30 PM   #7
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Quote:
Originally Posted by Greenbon
does bad O2 sensor the reason for poor on gas?

Also, how do you change the O2 sensor?
The O2 could very well be the source of your poor fuel mileage. Especially if it has not been changed in quite awhile. Your vehicle might be a little different than mine but the O2 is usually located right behine the rear exhaust manifold on the exhaust pipe. There is this special tool for removing/installing the O2 Sensor so that you don't damage the wire when your installing the new sensor. It usually has a coating of anti-seize on the new sensor'* threads. Most people here recommend you stick with AC-Delco when you buy the replacement O2 Sensor
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Old 12-15-2004, 12:58 AM   #8
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if ur car is sc it should be under the big peice of plastic over the sc, there is a black peice of metal that says pcv on it just take out the screws and the pcv is right under it
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