1998 Ford Mustang hessitation and P1131 error

1998 FORD MUSTANG
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URBANWEASEL
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Engine Performance problem
1998 Ford Mustang V8 Two Wheel Drive Automatic 150k miles

I have replaced the coil pack and spark plugs and wires also the MAF sensor
the car ran great for several days till the misfire came back, origionally there was a p1131 and code for #2 misfire, Now even with the maf unplugged it still shudders I checked the fuel pressure and it stayed at 32 pounds running at idle
Thanks in advance for your help
Jeff
Nov 30, 2009 at 12:08 PM
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RACEFAN966
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Ok so have you checked that injector? The P1131 is lean code related to an O2 sensor or PCM or vacuum leak or? So if you would unplug injector number 2 and ohm it get back to me with what it ohms out at and what scale you checked it on. Thanks.
Nov 30, 2009 at 9:00 PM
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URBANWEASEL
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Its running great at the momement, last night I pulled #2 plug and checked it it wasnt fouled and looked good,
there was a bad pcv hose i replaced, check engine light is still on, it will run good for a day or two then start back to the misfire, I will check the injector when it starts to run bad again
Dec 1, 2009 at 6:41 AM
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RACEFAN966
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Ok sounds good. As for the engine light it will stay on untill the codes are cleared. So call around to your local parts stores and find one that will do a free scan. Scan it and note the codes then clear them. If the light comes back on the recheck it. Let me know how it goes.
Dec 1, 2009 at 9:56 AM
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URBANWEASEL
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started to run bad again after a 20 mile trip
still had misfire this morning and turned it into get diagnostics run on it, I suspect your right with the bad fuel injector, will let you know what they say
Jeff
Dec 2, 2009 at 6:53 AM
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RACEFAN966
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OK great let me know how it goes and what they find. If we need to do more testing then let me know and we will.
Dec 2, 2009 at 10:12 AM
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URBANWEASEL
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turned out to be the oxgen sensor ,The "check engine" light hasnt come back on but only have 20 miles on it since the o2 sensor was replaced, I will update if it isnt the problem, I can tell a difference in the way it runs
Dec 3, 2009 at 6:09 PM
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RACEFAN966
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That is great. Great job glad you found it. I was pretty sure it was going to be the simple like that. If anything changes yes please do let me know. Otherwise have a great day and a Merry Christmas.
Dec 4, 2009 at 9:49 AM