Lean and Rich at the same time? - Ranger-Forums - The Ultimate Ford Ranger Resource

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Old 01-28-2012
Thread Starter
Join Date: May 2011
Location: Pa
Posts: 10
Lean and Rich at the same time?

I have a '97 Ranger 4.0L. Recently my check engine light went off. Both sides of the engine are running lean and rich. So four codes total. Not sure how this is happening because they are contradictory codes. I have a cold air intake and custom exhaust. Besides that i have replaced the wire hareness, replaced both MAF and EGR, cleaned out injectors, ran compression and smoke tests, and all that fun stuff. Any ideas on what could be pushing these codes?
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Old 01-28-2012
Kris03's Avatar
Join Date: Jun 2011
Location: glastonbury, ct
Posts: 1,236
o2 sensors?
my guess would be on faulty sensors/wiring
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Old 01-28-2012
Jp7's Avatar
Jp7 Jp7 is offline
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Join Date: Sep 2007
Location: My LED lab or on the dyno
Posts: 2,970
check your scaling tables - that will give you clues.

wasted money on a cai, because your truck came with that from ford.
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