ROUGH IDLE
Thread Starter
Team Owner
Joined: Dec 2003
Posts: 88,774
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From: L.A river under the Los Feliz Bridge
St. Jude Donor '14-'15-'17
ROUGH IDLE
When my 90 warms up and the computer goes to closed loop I get a rough idle? No codes present? Could that be a WEAK knock sensor?
Instructor
Joined: Nov 2002
Posts: 136
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From: ELLICOTT CITY MD
Re: ROUGH IDLE (anjdog2003)
CHECK TO MAKE SURE THAT THE O2 SENSOR IS SWITCHING. HOLD THE RPM TO ABOUT 2K AND WATCH THE O2 READING. IT SHOULD PASS .450 VOLTS UP AND DOWN SEVERAL TIMES PER MINUTE(@20). O2 SENSORS DO NOT HAVE ANY EFFECT ON THE ENGINE UNTILL THE ENGINE GOES INTO CLOSED LOOP.
