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mark houghton's Avatar
Join Date: Jul 2008
Location: Central Washington State
Posts: 3,776
Originally Posted by totle View Post
It might have been ignition issue as well.
I removed distributor cap and checked. Re-ired the spark wires.
Adjusted AFR today from 9 to 13,5 at idle.
Engine is running fine at idle and boost. Will log AFR now.
One strange thing I noticed today was that when accelerating in a turn, left or right, it seems like engine is loosing ignition or fuel, and stuttering and ends with a bang in the exhaust.
When accelerating straightforward all is well
That's weird. Got an almost empty gas tank...gas sloshing away from the intake and sucking air? (long shot, I know, but stranger things have happened).

Or, a bad electrical connection either fuel or ignition related...some wire somewhere moving in response to sideways engine/body torque. Try tugging on every wire you can get your hands on with the car idling in the driveway.
Mark H. 1987 930, GP White, Wevo shifter, Borla exhaust, stock everything else. The result of a massive Pelicanite good will fire recovery effort. Truely an open book, ready for the slippery slopes to modification.
Old 05-10-2010, 02:46 PM
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Smart quod bastardus
fredmeister's Avatar
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,232
Check both fuel pump relays that they are fully seated in their sockets. you may have a loose connection where one is cutting out intermittently.
1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 05-11-2010, 10:49 AM
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Join Date: Aug 2004
Location: Maryland
Posts: 738
You may also want to check that the ground strap from the engine to the rear body is tight and clean, too.

Trying to figure out things that could be affected by the engine moving in its mounts from left to right...

could also be a wire or plug/coil lead getting bent or compressed or shorted during right or left motion...

1988 930 coupe - Silver Metallic
3.3L w/GT35R, B&B Headers, RarlyL8 muffler, TurboKraft IC, Tial WG, tecGT based phased sequential EFI & ignition, Wevo shifter/coupler, ...
Old 05-11-2010, 04:00 PM
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