Low MPG and P0190

mdb12002 · January 14th, 2012, 03:41 PM

As the title states, I noticed that my car is only getting around 6-7mpg city and about 10-11 highway. This is under normal highway speeds also. I did not think too much of it at first. I changed the sparkplugs which involved me taking off the COP's, and one was hurting a little bit, the rubber housing came off, and the spring was exposed. I just put the housing back on, and bolted it back in without worries. One day at the track, I was doing a run, and the car bogged down, sputtered, and threw a P0190. I parked the car, cleared the code, and it went away. I drove the car back with no issue with no sign of the code. About 2-3 weeks later, I was sitting at a stop light on my way home to park the car for my deployment, and the code came again, along with the sputtering. The car wont die, just runs like total SH*T. Except this time the car is keeping the code, and wont get rid of it. I know I shouldnt be getting that low of mileage with my setup. I run a P1SC at 9lbs with dual SVT pumps, a KB BAP, and 42lb injectors. I know this has been brought up before, but it has been some time, and I want to know if anyone has experienced this issue lately, and could offer some guidance. Maybe a bad connection with the COP? FRPS? Im lost ):

stal94gt · January 14th, 2012, 03:48 PM

Could have blown your frps sensor or it could be fpdm issue. Your running alot of amps with the twin focus pumps and bap combo

mdb12002 · January 14th, 2012, 03:56 PM

Being I run alot of amps with that setup, should I drop back down to a single pump setup with the BAP? or just replace the fpdm and frps? I already have a FRPS on standby for when I return in the coming weeks. Thanks for your input!

mdb12002 · January 14th, 2012, 04:56 PM

I also read that with dual pumps and a KB BAP, it significantly reduces the life of the FPDM. I thought about upgrading to a dual FPDM setup to reduce the strain of a single one. Any input on this dual setup?

stal94gt · January 14th, 2012, 05:39 PM

Dual fpdms is a good setup. You have to run an additional power wire to your second pump but it prevents thermal shut down and damage. I run a modified fpdm with my dual ford gt pumps and bap combo. It does take quite a bit of tweaking on the fp voltage tables to get it right so be sure your tuner is good.

mdb12002 · January 14th, 2012, 06:00 PM

I tried to find a modified fpdm for my '02 gt with no luck. Looks like they only make them for the 03/04 cobras?

mdb12002 · January 14th, 2012, 06:01 PM

Do you think this could contribute to my low mpg?

stal94gt · January 14th, 2012, 06:04 PM

Cobra and gt fpdms are diff part numbers but both work. Do a quick test, pull the reference vac line at the frps and smell for gas. If you smell a strong fuel smell it is damaged. This is not a full proof test cause it could be damaged and not leak fuel.

mdb12002 · January 14th, 2012, 06:49 PM

I will do that as soon as I get back on U.S. soil. I appreciate all the help though, I hope I can get it fixed relatively fast when I return! Plan on taking a trip with it

cliffyk · January 14th, 2012, 06:57 PM

P0190 is a very distinct code indication a problem with the Vref power to the Fuel Rail Pressure Monitor--read possible causes and diag tips here.

Vref is supplied by the PCM and is normally 5.0V, though anything 4.0V to 6.0V is OK--you can measure it between the brown/white (+) and gray/red (-) wires at the FRPS...

mdb12002 · January 14th, 2012, 07:02 PM

So your saying the sensor probably went bad? Because I think if the FPDM failed, the car wouldnt be getting ANY fuel, and just wouldnt run, correct me if im wrong. Im new when it comes to working electrical issues on these cars.

cliffyk · January 14th, 2012, 07:10 PM

Originally Posted by mdb12002

So your saying the sensor probably went bad? Because I think if the FPDM failed, the car wouldnt be getting ANY fuel, and just wouldnt run, correct me if im wrong. Im new when it comes to working electrical issues on these cars.

I am saying that, according to the Ford shop manual, P0190 has nothing to do with the fuel pump driver module--and has everything to do with the reference voltage the PCM supplies to the fuel rail pressure sensor--so it would seem most logical to check that first...

mdb12002 · January 14th, 2012, 07:35 PM

and this is something that could change while sitting at a stoplight? I mean I threw the code originally at the track, but went away for a couple of weeks, then returned for good. Thanks for your guy's help!

cliffyk · January 14th, 2012, 07:48 PM

Sure, many components (especially sensors) in a modern EFI system can fail in stages--from intermittent to just plain dead...

mdb12002 · January 14th, 2012, 07:54 PM

Thats good to know, that what it did. I really appreciate the information! Now I just have to get state-side to start looking into it! only a few more weeks.. its been bugging me since I left back in march of last year haha.

January 14th, 2012, 03:41 PM	#1
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	Low MPG and P0190 As the title states, I noticed that my car is only getting around 6-7mpg city and about 10-11 highway. This is under normal highway speeds also. I did not think too much of it at first. I changed the sparkplugs which involved me taking off the COP's, and one was hurting a little bit, the rubber housing came off, and the spring was exposed. I just put the housing back on, and bolted it back in without worries. One day at the track, I was doing a run, and the car bogged down, sputtered, and threw a P0190. I parked the car, cleared the code, and it went away. I drove the car back with no issue with no sign of the code. About 2-3 weeks later, I was sitting at a stop light on my way home to park the car for my deployment, and the code came again, along with the sputtering. The car wont die, just runs like total SHT. Except this time the car is keeping the code, and wont get rid of it. I know I shouldnt be getting that low of mileage with my setup. I run a P1SC at 9lbs with dual SVT pumps, a KB BAP, and 42lb injectors. I know this has been brought up before, but it has been some time, and I want to know if anyone has experienced this issue lately, and could offer some guidance. Maybe a bad connection with the COP? FRPS? Im lost ): __________________ Just your average '02 GT* Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 03:48 PM	#2
stal94gt I Post Entirely Way Too Much 2003 mustang v6 ;) slow Join Date: May 2010 Location: eglin afb florida Posts: 10,197 iTrader: 2 reviews	Could have blown your frps sensor or it could be fpdm issue. Your running alot of amps with the twin focus pumps and bap combo __________________ bone stock from the factory!

January 14th, 2012, 03:56 PM	#3
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	Being I run alot of amps with that setup, should I drop back down to a single pump setup with the BAP? or just replace the fpdm and frps? I already have a FRPS on standby for when I return in the coming weeks. Thanks for your input! __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 04:56 PM	#4
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	I also read that with dual pumps and a KB BAP, it significantly reduces the life of the FPDM. I thought about upgrading to a dual FPDM setup to reduce the strain of a single one. Any input on this dual setup? __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 05:39 PM	#5
stal94gt I Post Entirely Way Too Much 2003 mustang v6 ;) slow Join Date: May 2010 Location: eglin afb florida Posts: 10,197 iTrader: 2 reviews	Dual fpdms is a good setup. You have to run an additional power wire to your second pump but it prevents thermal shut down and damage. I run a modified fpdm with my dual ford gt pumps and bap combo. It does take quite a bit of tweaking on the fp voltage tables to get it right so be sure your tuner is good. __________________ bone stock from the factory!

January 14th, 2012, 06:00 PM	#6
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	I tried to find a modified fpdm for my '02 gt with no luck. Looks like they only make them for the 03/04 cobras? __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 06:01 PM	#7
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	Do you think this could contribute to my low mpg? __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 06:04 PM	#8
stal94gt I Post Entirely Way Too Much 2003 mustang v6 ;) slow Join Date: May 2010 Location: eglin afb florida Posts: 10,197 iTrader: 2 reviews	Cobra and gt fpdms are diff part numbers but both work. Do a quick test, pull the reference vac line at the frps and smell for gas. If you smell a strong fuel smell it is damaged. This is not a full proof test cause it could be damaged and not leak fuel. __________________ bone stock from the factory!

January 14th, 2012, 06:49 PM	#9
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	I will do that as soon as I get back on U.S. soil. I appreciate all the help though, I hope I can get it fixed relatively fast when I return! Plan on taking a trip with it __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 06:57 PM	#10
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,805 iTrader: 1 reviews	P0190 is a very distinct code indication a problem with the Vref power to the Fuel Rail Pressure Monitor--read possible causes and diag tips here. Vref is supplied by the PCM and is normally 5.0V, though anything 4.0V to 6.0V is OK--you can measure it between the brown/white (+) and gray/red (-) wires at the FRPS... __________________ -cliff knight- My Mustang 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, DF Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch, WX EFX COPs 3.73s, 262 rwHP/305 lb-ft. Flex-fuel: burns gas and rubber...

January 14th, 2012, 07:02 PM	#11
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	So your saying the sensor probably went bad? Because I think if the FPDM failed, the car wouldnt be getting ANY fuel, and just wouldnt run, correct me if im wrong. Im new when it comes to working electrical issues on these cars. __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 07:35 PM	#13
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	and this is something that could change while sitting at a stoplight? I mean I threw the code originally at the track, but went away for a couple of weeks, then returned for good. Thanks for your guy's help! __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

January 14th, 2012, 07:48 PM	#14
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,805 iTrader: 1 reviews	Sure, many components (especially sensors) in a modern EFI system can fail in stages--from intermittent to just plain dead... __________________ -cliff knight- My Mustang 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, DF Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch, WX EFX COPs 3.73s, 262 rwHP/305 lb-ft. Flex-fuel: burns gas and rubber...

January 14th, 2012, 07:54 PM	#15
mdb12002 Regular 2002 Mustang GT 11.56@119.24 Join Date: Dec 2011 Location: Norfolk, VA Posts: 159 iTrader: 0 reviews	Thats good to know, that what it did. I really appreciate the information! Now I just have to get state-side to start looking into it! only a few more weeks.. its been bugging me since I left back in march of last year haha. __________________ Just your average '02 GT Stock bottom end Slower than yours 459rwhp/415tq

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