1998 Ford Mustang hessitation and P1131 error

Tiny
URBANWEASEL
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  • 1998 FORD MUSTANG
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
Monday, November 30th, 2009 AT 12:08 PM

7 Replies

Tiny
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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.
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Monday, November 30th, 2009 AT 9:00 PM
Tiny
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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
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Tuesday, December 1st, 2009 AT 6:41 AM
Tiny
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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.
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Tuesday, December 1st, 2009 AT 9:56 AM
Tiny
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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
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Wednesday, December 2nd, 2009 AT 6:53 AM
Tiny
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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.
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Wednesday, December 2nd, 2009 AT 10:12 AM
Tiny
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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
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Thursday, December 3rd, 2009 AT 6:09 PM
Tiny
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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.
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Friday, December 4th, 2009 AT 9:49 AM

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