HOW DO I GET IT TO IDLE SMOOTH AND PASS SMOG?

1990 Ford F-150

Tiny

FreAkytOasTer777

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.

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5 Answers

Tiny

ASEMaster6371

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.

Roy

Tiny

FreAkytOasTer777

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?

Tiny

ASEMaster6371

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

Roy

Tiny

FreAkytOasTer777

May, 5, 2012 AT 9:03 PM

Ok, thanks for your help

Tiny

ASEMaster6371

May, 5, 2012 AT 9:06 PM

Good luck

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