running rich
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Joined: Aug 2009
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running rich
!989 C4 I installed long tube headers. I removed pre cats and middle cat and installed flowmaster 40 series mufflers. The problem I have is it running very rich (LOTS OF SMOKE AND GAS FUMES TO THE POINT THAT YOU CAN NOT START IT IN THE GARAGE)
Le Mans Master
Joined: Aug 2007
Posts: 8,735
Likes: 412
From: WV
It may be because of the O2 sensor location on your new headers. If you had to move the O2 sensor farther away from the motor it may not be getting hot enough to work properly..If this is the case you either have to move the 02 sensor to the original distance from the head or use a heated O2 sensor.If the above is not the problem you could have a air leak above the 02 sensor that is giving the sensor a false reading causing it to dump more fuel to compensate for the extra air....WW
Last edited by WW7; Dec 13, 2009 at 11:08 AM.
Burning Brakes
Joined: Oct 2009
Posts: 773
Likes: 2
From: Minneapolis MN
It may be because of the O2 sensor location on your new headers. If you had to move the O2 sensor farther away from the motor it may not be getting hot enough to work properly..If this is the case you either have to move the 02 sensor to the original distance from the head or use a heated O2 sensor.If the above is not the problem you could have a air leak above the 02 sensor that is giving the sensor a false reading causing it to dump more fuel to compensate for the extra air....WW
Also from what I read & learned on this forum it wouldn't be a bad idea to get a tune.Also your exhaust will not be as clean & will polute more since cats are removed.
