One Bank Lean one perfectly fine? - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 02-16-2008
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One Bank Lean one perfectly fine?

Does anyone have any ideas for me to start checking on my motor. The truck is still acting up after i fixed the pass side exhaust leak before the cats. I tried spraying around the motor for vacuum leaks but i didnt get anything. Unless from the leak the pass 02 sensor is bad and fouled out i am stumped.

the symptoms of my truck are as follows..

The truck will somtimes run right for a while and then will all of a sudden run crappy(leans out on right bank and gets rich) so it will bog down and lose power. i cant even hit 65-70 somtimes. and then somtimes it will run crappy then good for a second then bad then good. so its nothing consistant thats for sure. And at idle it will be crappy at stoplights somtimes not. and even at a cold start or start after just a little while after driving it will run bad. Its not fueal related, ive scanned it and all the numbers are good.

so can anyone give me some ideas to check. Ive checked online for multiple cars and makes and found things as strange as power steering fluid leaking from the pressure switch onto the wiring harness of the precat 02 and it getting on the sensor and fouling it out. they cleaned the wires, replaced the switch and 02 and it fixed it.

i just want to figure this out on my own. im getting real sick of the problem and i really dont want to pay someone to fix it
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Old 02-16-2008
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Make sure what you use to spray is flammable. I would aim towards a vacuum leak you haven't seen yet. Have you checked to see that the o2s are switching properly. I've had intermittent injector problems on 5.0s before. Add the custom wiring work and you got options. Let me know.
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Old 02-16-2008
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Either a vacuum leak or bad O2 sensor, I agree. You can switch the sensors betwen the banks and see if it moves. If it does, buy a new pair of sensors. I replace mine periodically.
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Old 02-16-2008
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im going to take out all of the 02 sensors tomarrow and look at them. see if any have bad deposits on it. otherwise i guess im going to have to look harder for a leak. its hard to get yer head in places without having it on a lift
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Old 02-16-2008
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Yes it is. Take a peak at your egr system and pcv as well.
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Old 02-16-2008
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what should i look for in it? i havnt looked at one to see what i should be sure works
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Old 02-17-2008
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Make sure the to hoses going to the dpfe are on and on right, make sure there is no vacuum leak at the egr base. Check the pcv for proper function, if you can blow through it, replace it. Make sure the egr hose is good.
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Old 02-17-2008
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alright, im gona put it in the garage and see if i can come up with anything
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Old 02-19-2008
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Figure it out? If not let me know, I can help you out.
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Old 02-19-2008
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nah i looked it over but i couldnt find anything out of the norm. Damn i was gona ask ya, but i took it to my mech and hes gona look it over and let me know what he finds and if its somthn i can do im gona do it myself
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Old 02-20-2008
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Cool, let me know!
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Old 02-26-2008
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I found out that the #2 cylinder's injector connector was faulty and shorted out. replaced it with a new pigtail and im good to go!

i knew it was gona end up being some dumb problem
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Old 02-26-2008
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At least it was as dump CHEAP problem!
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Old 02-26-2008
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yeah.. coulda been worse as they say. those damn ford pigtails aint cheap though :)
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Old 02-26-2008
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True. But there are things more expensive, lol...
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Old 02-26-2008
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like blowing a motor.. which got me the 5.0 lol
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Old 02-27-2008
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Yes indeed -- a good case of turning "lemons into lemonade".
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Old 02-27-2008
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Glad you found it!
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Old 02-27-2008
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thanks! me too haha
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