PCV Valve??
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Senior User
Joined: Apr 2003
Posts: 384
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From: Acworth, GA
PCV Valve??
Can a bad PCV valve contribute to a rough idle? My mechanic is telling me that that is part of the problem, but I can't logically make the connection as to why. Any opinions (for engine info, see sig)?
Posting Guru
Joined: Apr 2000
Posts: 1,746
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From: PNW
PCV Valve??
According to the shop manual it can. I've never noticed a difference when putting a new one on, perhaps because the old one hadn't failed. I suppose it would have to either be plugged up or wide open to have any effect. For $3, I don't worrry as to whether it's bad or not, I just replace it regularly.
Senior User
Joined: Nov 2001
Posts: 319
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From: Sacramento
PCV Valve??
Yes it can affect performance, at least on my '96 4.0. It won't idle well, or get good mileage, with a "bad" one. This includes a brand new Fram replacement. Go for the OEM Ford valve. It fits, apparently, and it solved my rough idle problem inexpensively.
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Senior User
Joined: Apr 2003
Posts: 384
Likes: 0
From: Acworth, GA
PCV Valve??
Replaced it at lunch, didn't do any good in helping me keep from stalling when I fire the van up, but the other valve didn't rattle at all when I took it out. Still worth th $3 or so I paid for it I'll bet.
