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Registered User
Join Date: Nov 2010
Posts: 7
Cold running issue (Video)


Firstly thanks for looking!

I have a problem with my 930 engine related to running while cold.

The car will start up and run on first crank when cold, however the car seems to run VERY rich and the exhaust is black and somewhat bellowing out. The car also seems to be missing when given some throttle and really doesnt go away until the car is fully warmed up. It started several months ago when accelerating it would seem to be missing every once in a while and has progressively gotten worse over the past several months.

Though the video doesnt really show the extent of the exaust, its pretty bad. Thanks again for looking! Im hoping its not a WUR problem but my guess is that its looking like its time for a rebuild?


930 cold - YouTube
Old 12-10-2011, 10:09 AM
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mooney265's Avatar
Join Date: Sep 2008
Location: New Orleans
Posts: 1,365
my guess is you are too lean when attempting to accelerate while engine is cold. It's very hard to geta happy medium when these engines are cold.

I have wideband afr and when cold my engine idles at 11 afr. Any leanee and it will sputter under accel. I begin to missfire at 15.9 afr.

How does it run when warm?
LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 12-10-2011, 10:29 AM
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