Ok, how do you adjust for a lean mixture?

jhodg5ck said:

by turning the CO adjusting hex bolt clockwise. It is just in front of your air metering plate. 3 mm hex key..insert, push down till it bottoms, turn in fractions of a flat to adjust.

I would check your voltage @ the air idle valve after adjusting the mixture/CO (btw, this only effects up to 2500 RPM mixture wise).
When was your O2 changed last?

Does the car have a rough idle?

Jonathan

Click to expand...

Thanks man, appreciated. No it idles fine, purrs like a kitten. Have no idea when the 02 was last changed. Should I swap them out ya think? Doesn't hurt as far as preventitive maintenance.....


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So just take the 4th grey wire and clip it and run it to the ground on the battery, correct?

Also, I can use a sensor from a mustang, right? I might have one of those around--I have 95 Mustang GT, so that should work fine, right (last of the 302 5.0 liter engines.)

How do I tap into the lambda and where is it on a 420 SEL 1991. I found an article talking about the emissions, but couldn't find out where the port is for it.

I'd like to install a wideband, but they are still kind of spendy for a one shot calibration of Air/Fuel ratio. I guess I could run it on a dyno for $60 to get an air/fuel reading... Would that be better than reading the millivolts?


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