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Old 05-24-2014, 10:29 AM   #1
monera05
 
Join Date: May 2013
Vehicle: 2005 ford mustang gt
Location: Ontario
Posts: 2
Default 05 gt p0191 error code

Hey guy's

Been posting on many forum in regards to my issue here
Before I take it into ford.
Issue is p0191, p1237 and the pump is constantly running with the key on (no engine start) but yes it turn off once key is off ,
as the chart below shows i'm seeing 75psi at the fuel rail, and pump is at 0.75 duty (150%?)

can anyone look at this data log and tell me if the pump seem to be bad , i see negative values at the pump, but the tables (pcm and fpdm) is giving positive voltage
Before i take it into ford just wanted some of y'all professional advise!

Thanks!

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Old 05-24-2014, 10:57 AM   #2
moosestang
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Vehicle: 2006 mustang gt
Location: Gainesville, FL
Posts: 11,262
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Does the car start? The pump runs and runs with the key on, engine off? It could be the fpdm or even the fuel pressure sensor
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whipple HO SC,FRPP k springs, Pypes mid mufflers, hurst, frpp TB, 4.10's, spohn lca's, adj. UCA, relo brackets, 1 piece DS, spec stg 3+ clutch. 12.52@117.6mph so far with a 2.01 60 ft time

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Old 05-24-2014, 11:23 AM   #3
moosestang
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this turned out to be a short to ground with the pump, but my money is on the fpdm.
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whipple HO SC,FRPP k springs, Pypes mid mufflers, hurst, frpp TB, 4.10's, spohn lca's, adj. UCA, relo brackets, 1 piece DS, spec stg 3+ clutch. 12.52@117.6mph so far with a 2.01 60 ft time

Pumpkin jacking addict
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Old 05-25-2014, 08:59 AM   #4
monera05
 
Join Date: May 2013
Vehicle: 2005 ford mustang gt
Location: Ontario
Posts: 2
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fpdm and fps have been replaced
car runs perfectly fine
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Old 05-26-2014, 01:03 AM   #5
Simon1
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Vehicle: 2006 Mustang GT
Location: Redding, CA
Posts: 4,213
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Most of the twin pump set ups I've seen with issues usually come down to some type of wiring issue. Either bad ground or too small of wire. Just a guess.
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Old 05-26-2014, 04:17 PM   #6
moosestang
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Quote:
Originally Posted by Simon1 View Post
Most of the twin pump set ups I've seen with issues usually come down to some type of wiring issue. Either bad ground or too small of wire. Just a guess.
He doesn't have a twin pump. If the fpdm and fps have been replaced, then that only leaves a short in the pump or a short in the wiring.
__________________
Boost or Buell, decisions, decisions.

whipple HO SC,FRPP k springs, Pypes mid mufflers, hurst, frpp TB, 4.10's, spohn lca's, adj. UCA, relo brackets, 1 piece DS, spec stg 3+ clutch. 12.52@117.6mph so far with a 2.01 60 ft time

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Old 10-16-2014, 01:11 AM   #7
drumhedd2005
 
Join Date: Oct 2012
Vehicle: 2005 Ford Mustang GT
Location: CA
Posts: 5
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Im having the opposite problem. I keep getting the same code on my 05' GT. The pump stays on for a second when i turn key on (normal) but it starts REALLY HARD. Other times it doesn't start hard. It idles perfectly normal with no backfiring or missing. I replaced the fuel pump in Sept 2012, fuel filter was replaced about 2000 miles ago, I cleaned the MAF sensor, replaced spark plugs, and also replaced the fuel rail sensor. The car hesitates sometimes when I press down on the gas (not jumping on it) which is triggering the code. Its almost as if something is causing the fuel pressure to "hiccup." Any ideas????????
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Old 10-16-2014, 01:11 AM
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