[s-cars] stumble and smoke at idle

[Joshua Van Tol]

Have you looked to see if the fuel pressure regulator diaphragm is leaking?
Sounds like a likely culprit to me.


On Mon, Dec 14, 2009 at 11:54 AM, james McCarthy <jjssmccarthy at yahoo.com>wrote:

> Ok,
> New problem. 2 days ago my s6 (full OEM RS2 bits) developed a stumble on
> initial start up - but cleared within the first 10 seconds or so of driving.
>  This was associated with thick exhaust. Considered ignition
> (coil/pos/plugs) or leaking injector.  So replaced the plugs (new bosch
> F5DPOR) and the stumble seemed to be gone...
> However this am the stumble was back on initial start up only - not as
> severe and lasted just 2-3 seconds... but now I have "heavy" exhaust at idle
> even after driving for 10-15 minutes.  No puffs with hard acceleration just
> at idle... car seems to be running perfectly otherwise pulls strong to
> redline with full boost and no stumbles...
> So where to start - I doubt coil/pos (5 new oem 20K ago)  as I would expect
> the stumble to persist.  So I'm thinking PCV system as I can't figure why a
> leaking injector would result in continued thick idle. Also while turbo
> seals or valve seals are possible - I can't figure how they would cause the
> initial rough idle.
> So plan is to clean out the PVC system (also installing a catch can) and
> also see if I can determine if an injector is leaking.  Any thoughts or
> advice would be appreciated.
> tia
> -jamie
>
>
>
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