Implies the mixture is rich, since removing the oil filler cap allows more
air to be sucked into the engine without a corresponding increase in fuel.
If the mixture were correct removing the cap would tend to stall the engine.
PaulH.
-----Original Message-----
From: DENNIS COX <djc@appsig.com>
To: mgs@autox.team.net <mgs@autox.team.net>
Date: 20 October 1999 17:45
Subject: Rough Idle
>Trying to tune out my rough idle last night I encountered and odd
>symptom. When I remove the oil cap the engines idle smoothes out a bit
>and actually increases in rpm's. It's a 67 with that large diaphragm
>style PCV valve. I have an alloy valve cover with a vented cap. Any
>ideas? I was toying with the idea of replacing the intake manifold with
>the Maniflow intake. It doesn't have any provisions for a PCV.. Has
>anyone here set up one of these manifolds? Any comments or "gotchyas"
>to watch out for?
>
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