Code p0191

2010 FORD MUSTANG
58,000 MILES • 4.6L • V8 • 2WD • AUTOMATIC
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TROYSTERR
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Code p0191 came up. i replaced fuel filter still sputters then replaced fuel rail pressure sensor still sputters, replaced fuel pump still sputters. please help.
Aug 5, 2016 at 5:57 AM
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HMAC300
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that is a fuel pressure circuit problem. check fuel pressure with a gauge auto parts rent it. see picture for other causes.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Aug 5, 2016 at 7:02 AM
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TROYSTERR
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I have a tuner its data log says fuel jumps from 40 down to 10 shoots up to 75 i guess it is psi.
Aug 5, 2016 at 7:11 AM
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HMAC300
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check it at idle not reving it up it should be in the 40 range all the time if not then it is the pump or regulator soit with a gauge not electrically.
Aug 5, 2016 at 7:20 AM
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TROYSTERR
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Okay thanks, i appreciate this a lot. I replaced fuel pump, fuel filter, fuel rail pressure sensor already.
Aug 5, 2016 at 7:26 AM
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HMAC300
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reading your post said you have a tuner and that may be your problem. the fuel pressure should not go below or down to 10 psi under any condition unless it has been shut off for days. the regulator may be part of fuel pump have the fuel pump driver module checked as the tuner may be messing that up causing your problem.
Aug 5, 2016 at 9:27 AM
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TROYSTERR
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Okay thanks, and god bless ya.
Aug 5, 2016 at 10:12 AM
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STRAILER
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If you still get the code you may have a wire that has failed, please do a pin to pin check.

Here is a guide to help you.

https://www.2carpros.com/articles/how-to-check-wiring

Let me know what you find

Best, Ken



Aug 11, 2016 at 8:36 PM
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TROYSTERR
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I will, I'm waiting for fuel pump driver module to arrive if still having problem i will check wires thnx
Aug 12, 2016 at 8:40 AM
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TROYSTERR
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Hey Ken, i installed fuel pump driver module Saturday and fuel pressure is a steady 40 psi drove it for about 30 min. Ran fine hopefully it's fixed haven't drove it since
Aug 15, 2016 at 9:29 AM
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STRAILER
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Good to hear, let us know if you need anything else. Please use 2Carpros anytime.

Best, Ken
Aug 15, 2016 at 11:50 AM
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TROYSTERR
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Code p1000 advance trac,abs lights on dash won't go off. It was wet out i got on it a little hard tires spun lights been on for week
Dec 17, 2016 at 6:10 AM
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HMAC300
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have amechanic check for an abs code to see what is setting it off it will knock off traction as well may be a sensor or rust on sensor. or a wire broke
Dec 17, 2016 at 7:40 AM
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TROYSTERR
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Ok,thnx is there anything i can do kinda short on funds i have a sct tuner can i check anything with that 2010 gt
Dec 17, 2016 at 7:50 AM
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HMAC300
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don't know if they work on abs or not a lot don't they just do engine/trans. check for rust on sensors as they are magnetic or junk around signal wheel if you can see there.
Dec 17, 2016 at 10:41 AM