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oilonly oilonly is offline
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Join Date: May 2008
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Originally Posted by bpu699 View Post
Odd you should mention that. Last week I disconnected the oxygen sensor, and it made no difference. Now, I just did it, and disconnecting it fixed the problem for now.

I bought the plx afr meter, will connect next week.

Would a flaky Bosch oxygen sensor do this? The prior owner had it disconnected.

Note that I did have to lean it out a quarter turn either way.

I do wonder if after years of sitting something in the fuel system was constricted, and it just opened causing a rich condition...
Disconnecting a working Oxy sensor/Lambda system as i have done just for test purposes on my '87 will make the engine run lean around 17.5 AFR. Reconnecting it back up will take it back to 14+- on my car, just right. Maybe someone adjusted the air fuel mixture screw with the Oxy sensor disconnected (made it richer) but then with the Oxy sensor installed back you will run too rich. I feel an AFR gauge is a must on these cars, JMHO
'87, Modified WUR, Billet valve, 965 downpipe, Kokeln intercooler, GHL headers, Garrett T04B K27 hybrid, Tial w/.8 bar, WEGO IV, RarlyL8 dual out, LSD
Old 07-28-2014, 07:14 AM
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