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HOW DO I GET IT TO IDLE SMOOTH AND PASS SMOG?
1990 Ford F-150
May, 5, 2012 AT 8:47 PM
4.9l 5speed 4X4 duel tanks did tune up and replaced fuel pressure regulator. Still is idleing too rich and has a missfire at idle.
FOUND 660 RELATED QUESTIONS
May, 5, 2012 AT 8:49 PM
Look for vacuum leaks. Is the check engine light on? O2 sensors were common back in the day. Map sensors were issues as well. All need to be verified by a shop with a scan tool.
May, 5, 2012 AT 8:55 PM
Check engine light is on steady, I checked seld diagnostic and codes "31" and "67" are flashed Would the evp voltage being low (code 31) make it do that?
May, 5, 2012 AT 8:58 PM
Not really unless it is pulling raw fuel from the tank but not likely. You need some help here unless you have a scan tool
May, 5, 2012 AT 9:03 PM
Ok, thanks for your help
May, 5, 2012 AT 9:06 PM
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