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Porsche Junky
 
mede8er's Avatar
 
Join Date: Nov 2004
Location: Salida, CO
Posts: 1,804
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Instant lean...

Well, took the car to the track this weekend....must say the Turbo is a whole new racing experience.

2nd to last heat I made a fuel stop and got in line in the paddock, car started to die....AFR guage dropped to max lean condition for no apparent reason and cylinder head temps jumped to 500.....

Limped home and will look at it this evening. What do you think?? Vacuum leak, timing issue??? Gotta be something simple to have changed so quickly....

TIA,
Brodie
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1986 930 RUF equipped
Old 05-07-2007, 05:28 AM
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Join Date: May 2004
Location: Encinitas (San Diego CA)
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Ben (MB911) had a hose melt, which bled pressure to his blow off valve or something. His results were disastrous.

Proceed with caution.

Doug
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Old 05-07-2007, 02:43 PM
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Porsche Junky
 
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I started it from cold and it ran perfectly, with a normal A/F reading (slightly rich) until the cold start valve kicked off...then back into the low red zone....

BTW, could you direct me to the A/F adjustment screw...doesn't seem to be in the same place as my older CIS system...

I also don't see a convenient test port for my uel pressure guage....
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Last edited by mede8er; 05-07-2007 at 03:11 PM..
Old 05-07-2007, 02:46 PM
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Yeh sounds like a vacuum leak to me. Check all your hoses in/around the intake.
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Merv
'89 911 Turbo Cab
Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Old 05-07-2007, 03:31 PM
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Porsche Junky
 
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Join Date: Nov 2004
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Yepper...line from BOV to intake was totally ripped...didn't see it till I had everthing off....

Still could use info on location of A/F screw and best port for fuel pressure testing...

Thanks all....
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1986 930 RUF equipped
Old 05-08-2007, 02:14 PM
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