302 FI sensor question
Thread Starter
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Senior User
Joined: Nov 2004
Posts: 234
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From: Mount Tremper, New York
302 FI sensor question
i have a 91 bronco with a 302, and it is running rich lately, only getting about 10-13 mpg, and leaving excessive black soot in the taipipe. i just replaced the O2 sensor...im not sure that will fix it.
are there any other sensors that i can check/replace to make it run better?
are there any other sensors that i can check/replace to make it run better?
Tuned
Joined: Jun 2003
Posts: 489
Likes: 1
try pulling the codes, that will tell you if any sensor is bad, or at least where to start looking. Had the same problem and it turned out to be my ECT (coolant temp sensor). BTW there are 2 sensors, one for the guage and one for the computer...the computer one is what can cause it to run rich like it is cold.
Hotshot
Joined: Jul 2002
Posts: 14,285
Likes: 12
From: Bend,OR
pull codes. a complete tune up wouldnt hurt either, check timing should be at 10* with spout connector removed. once this is all done disconnect your battery for about 15mins and then reconnect and drive for 30-45 mins. this allows the computer to relearn .
also pull the vacum line going into your FPR . if gas comes out then this to could be your problem.
late
also pull the vacum line going into your FPR . if gas comes out then this to could be your problem.
late
Thread Starter
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Senior User
Joined: Nov 2004
Posts: 234
Likes: 0
From: Mount Tremper, New York
i pulled the codes, got: 179, 327, 328, 332, and 173. saying that the evp has an undervolt, and its running rich.
i gave it a tune up(plugs, wires, cap, rotor)2 months ago, and i was fine till about 3 weeks ago, started using more fuel and stuff. i replaced the EGR and now the O2...
ill have to test the EVP
i gave it a tune up(plugs, wires, cap, rotor)2 months ago, and i was fine till about 3 weeks ago, started using more fuel and stuff. i replaced the EGR and now the O2...
ill have to test the EVP
