po175 one my 94 3.8

[Wayne]

ok here the whole story, had to have the passenger side exhuast pipe weld up it had cracked just in front of the cat, put on new O2s up stream sensors because scan tool showed one was a bit lazy had no code just trying to get better gas milage it has over 190,000 miles on it and the O2s had the ford stamp on it so I figured they had never been changed. anyhow found a vacuum leak on a hose under the intake had to pull it to replace the rubber hose cleared the codes at that point It was about the idle being at its limit I figure that was from the vacuum leak. anyway a few days later It had this po175 rich on bank 2. So now I clean the air mass sensor check the fuel pressure regulated about 32 unregulated about 40 psi will hold it with engine off I think forever which tells me no blead down through an injector or anywhere else. changed the air filter though it looked clean I thought it would be better so I pulled the k&n out of my GT and dropped it in it. :crybaby2: so I sent her on her way. I will check it again in a couple days. the mil light is burned out so Ill have to scan it to even know if there is still a problem in a day or two. Oh yeah I also check to make sure no critters had built a nest in the air duct feeding the air filter and it has a new pvc valve too I had broke it when I fixed the rocker arm a couple weeks ago when it came loose on the drivers side. and I disconnected the battery so it will clear everything and relearn the system to the changes now my question is if the po175 comes back what should I check next. :dontknow: Thank in advance for any Ideas I have never seen this code before on a car so I am a little puzzled over this one. #1
Wayne
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Re: po175 one my 94 3.8 Quote Modify Remove

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well I pulled all the plugs and the #4 cylinder is frosty black that tells me were the problem is so tomorrow Ill go from there to see whats going on with that injector I guess check for a solid ground on the wire and so on.


well # 4 injector sounds good, taps like a champ while running that tells me it not electrical a least. it threw the code po175 again today while I was driving it again. I put the lucas fuel injection cleaner to it a couple days ago but still no better though I was hoping. by the way the # 4 cylinder was the one that the rocker arm had come loose on on the exhaust valve. I really need help I am thinking of putting a set of injectors in it but thats a chunk of change. any other sugestions. also I had changed #4 plug and its fould again.

 

[Wayne]

Ok pulled the injectors out and found one was of a odd number it was in #3 cylinder though and it looked to be smaller and it had a odd looking end cap were it goes into the head more closed in around the busness end. anyway I ordered a set of accel 15 lbs/hr from summit they should be here tuesday. let you know how that works out.

 

[Wayne]

got the accel 15lbs/hr injectors in a day earlier then expected today put the car on the road let it warm up and recorded the data stream ever thing looks great on both banks LT fuel trim is about the same and the car runs like a champ a whole lot stronger then it has ever run I will let my daughter drive a while and recheck it and the fuel the fuel milage to see how its doing on that. Ill update in a week or so.

 

[cnryYell0gt]

someone put a non matching injector on it?

 

[Wayne]

yeah it was different from the rest. anyway after all this the idle started acting up and it coded idle at limit replaced iac reset computor and first mpg check was 22.67mpg