[V6-12v] Rough Idle

Tom Christiansen tomchr at gmail.com
Wed Nov 18 09:18:12 PST 2009


The lack of brake boost would indicate a vacuum leak. That can also cause
rough idle. Though, in this case it sounds like a slow leak so the cause of
the rough idle may be something else. I seem to recall there being a vacuum
reservoir somewhere.

~ Tom

On Wed, Nov 18, 2009 at 6:40 AM, David Torrey <davidtorrey2004 at yahoo.com>wrote:

> Well, I replaced all spark plug wires and the rough idle persists (wires
> had 180K miles on them).  Plugs are new. I checked vacuum connections and
> can't find any issues.  I have noticed that after the car sits for 8 hours
> there is no vacuum assist for the brakes until the engine runs for about 30
> seconds.  Not sure if this maybe related?  Possibly check valve faulty in
> the vacuum line going to the brake booster? Could it be fuel injector seals
> leaking air or MAF sensor?  Any experiences appreciated.
> David
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