01 GT need help with data log! - Ford Mustang Forum
 
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post #1 of 6 (permalink) Old 03-25-2014 Thread Starter
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01 GT need help with data log!

Alright I finally got the chance for my datalog for my mysterious power loss in the upper rpms around 5k or so. No it's not the rev limiter or getting out of the power band, it's like me slamming on the brakes almost. Anyways, tell me what you guys make of this please!

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[/SIGPIC]2001 mustang gt - accufab throttle body/plenum and intake spacer, airaid cold air intake, ram hdx stage 1 clutch, optima yellow top battery , 3.73 gears with fresh replacement of bearings, sr short throw shifter, much more to come .
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post #2 of 6 (permalink) Old 03-25-2014 Thread Starter
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As you can see... My voltage drops dramatically to my fuel pump. To 7 volts at one point, then as I stayed out if it the volts slowly went back up.

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[/SIGPIC]2001 mustang gt - accufab throttle body/plenum and intake spacer, airaid cold air intake, ram hdx stage 1 clutch, optima yellow top battery , 3.73 gears with fresh replacement of bearings, sr short throw shifter, much more to come .
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post #3 of 6 (permalink) Old 03-25-2014 Thread Starter
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This was all during a wot run btw, in case anyone was wondering. This one really shows that the fuel pretty much just stops, literally falls flat.
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[/SIGPIC]2001 mustang gt - accufab throttle body/plenum and intake spacer, airaid cold air intake, ram hdx stage 1 clutch, optima yellow top battery , 3.73 gears with fresh replacement of bearings, sr short throw shifter, much more to come .
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post #4 of 6 (permalink) Old 03-25-2014 Thread Starter
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If anyone would like anymore datalog pics, I can take some more. I had everything going for the fuel, and air seemed fine.

[/SIGPIC]2001 mustang gt - accufab throttle body/plenum and intake spacer, airaid cold air intake, ram hdx stage 1 clutch, optima yellow top battery , 3.73 gears with fresh replacement of bearings, sr short throw shifter, much more to come .
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post #5 of 6 (permalink) Old 03-27-2014 Thread Starter
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Bump?

[/SIGPIC]2001 mustang gt - accufab throttle body/plenum and intake spacer, airaid cold air intake, ram hdx stage 1 clutch, optima yellow top battery , 3.73 gears with fresh replacement of bearings, sr short throw shifter, much more to come .
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post #6 of 6 (permalink) Old 03-27-2014
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No information regarding mods. Is this a stock fuel pump?

Confirm that the fuel pump is compatible with 99-04 model year. It must be able to works with a FPDM and variable voltage.

Confirm the battery terminals are clean and tight. Confirm the frame grounds around the radiator core support are clean and tight. Confirm the ground in the trunk is clean and tight.

Have the alternator tested for excessive AC ripple (bad diode). Almost any auto parts store will test on the car for free.

If this were my car, I would CONFIRM the voltage drop at either the fuel pump fuse or the trunk mounted IFS switch. Once the voltage drop has been confirmed, then additional trouble shooting will be needed to figure out WHY the voltage is dropping.

My gut tells me this is a battery, alternator, battery cable problem and the charging system voltage is dropping to the entire car.

Bottom line. Today's cars simply will NOT run right without a strong battery and charging system. Every electrical problem should start with a review of the battery and charging system. Cut corners here at your own risk!

2003 GT Convertible (sold & missed)
2000 GT coupe (Craigslist project. Fixed. Now my DD). Windsor to Romeo swap.
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