98 durango negative fuel trim
Its been surging real badly when i drive it. Seems like the only way i can drive it is if i floor it.
Took it to have the codes scanned and there were none.
The fuel trim was maxed out rich (-33% ltft)
O2 s1b2 was hovering around 1v constant exept when i gave it some gas then it dropped raised to 1.2ish
The other side was normal.
I was thinking a injector was stuck open, but i dont know how to test them and see which one is bad w/o blasting it with the parts shotgun.
Someone else recomended a regulator.
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- cheryl hartkorn
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O2s1b2 LTFT is minus 33% and voltage in upstream bank2 is between 1 - 1.2v?
That means PCM is subtracting fuel because O2 sensor line readings are rich.
You can unplug one or two injectors (with engine running) and see what happend with O2 sensor voltage. If voltage goes down, O2 sensor could be good and you have an injector issue. Also you can have a fuel likeage from fuel regulator.
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I agree with Cheryl, unplug the bank two upstream sensor and see if the symptom goes away. It sure sounds like it's either stuck rich or shorted to voltage.
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Tyler, is it possible stuck rich? How could it happend? I understand reference PCM voltage is 0.45v.
Is it possible shorted to voltage when you have 1 to 1.2v oscillation?
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guafa wrote: Tyler, is it possible stuck rich? How could it happend? I understand reference PCM voltage is 0.45v.
Totally possible! Uncommon, but possible. SD has a video covering this:
Is it possible shorted to voltage when you have 1 to 1.2v oscillation?
Also possible? Depends on if it's a hard short or a resistive short (across green crusties, water, like that). Mostly, I'd be intersted to know if the symptom disappears when the O2 is unplugged, AND what the O2 voltage reading is with the O2 unplugged.
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If i ever learn what happened with it or if he fixed it i will let you great folks
know!
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