Thread: Small problem
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Dave 86 930 Fl Dave 86 930 Fl is offline
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Join Date: Dec 2005
Location: 1000 Islands NY
Posts: 405
Originally Posted by speednut View Post
Hi all,
I hope someone can give me an opinion one this . While I was on my trip to Wyoming from my home in Va (nearly a 5000 mile round trip) my afr's would drop from maybe 13.7 to 12.8 for seemingly no reason when I would accelerate lightly. Which is o.k. but when I went back to a steady cruise the afr wouldn't go back to my 13.7 it would stay at 12.6 or 7 ? It always use to return to a normal cruise afr ,what might cause that? And one other point,if I put it in neutral when this happens, shut the car off, turn it immediately back on, put it back in high gear , all returns to normal(I do this while still going down the road) Till the next time I accelerate lightly.. My normal afr on cruise is about 14.6 or 7 , elevation changes things especialy at 6000 to 10000 ft.. OH !! 1987 930 disconnected o2..

thanks for listening !!!!
I had a similar problem and I determined that my fuel metering plate was oscillating, which was causing the lower AFRs. I sent the fuel head off for a rebuild and the problem is solved. I was able to reproduce the low AFR situation in my garage with the air cleaner off and that is how I recognized that the metering plate was vibrating ... I'd suggest that you try the same test.
1986 930 - K27-7200, Andial Intercooler, Tial Wastegate, Electronic Boost Controller, B&B headers, Bodart Zork, Leask Adjustable WUR, Full Elephant Racing Suspension w/Adustable Spring Plates and Von Shocks, Wevo Transmission Mounts, Fuel Safe Fuel Cell, Forgelines (9"/11"), Hargett Shifter, Innovate AFR, Cobra CF Seats, DAS Rollbar, Coleman Floating Rotors, Lightweight Interior, Forgeline 17" x 9"/11", 2800 lbs.
Old 07-08-2010, 02:17 AM
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