sputtering under WOT

burnout5.0 · October 13th, 2010, 06:26 PM

okay so i have a 04 cobra and under WOT the car sputters pretty bad until about 1500 rpm before redline. i cant figure out for the life of me what it is. i replace the fuel filter, Fuel rail pressure sensor, spark plugs and i found a bad coil. still having the same issue after all of that. im tired of wasting money chasing this issue around. do you guys have any ideas??? please help me if you can. thanks.

04GTAMPA · October 13th, 2010, 06:36 PM

When you let go of the gas, does it 'pop' a lot? have you checked the injectors? Sounds like a dirty/clogged or just bad injector.

burnout5.0 · October 13th, 2010, 06:43 PM

yeah i ran injector cleaner through the car as well but that stuff really doesnt do much. im just not gonna go and through like 500 dollars down for injectors if thats not the issue ive already thrown enough money away as it is. i just wish there was a way i could locate this issue without throwing random parts at it. and no theres no pop ittl just sputter pretty bad until i let off. the car runs perfectly fine under normal driving around town. its just when u hop on the highway and punch it, it just runs like garbage and sputters.

weems · October 13th, 2010, 09:26 PM

You might have a vacuum issue or unmetered air getting in there somewhere. Also could be a pegged fuel pump. Whats your mods? Do you have a tuner? Do some datalogging.

burnout5.0 · October 13th, 2010, 09:49 PM

the car just has catback, CAI, 2.81 pulley and a dyno tune with a mustang dyno at EFI logics in CT. the car has had that setup for over a year now. and ive never had an issue. it started about a little less than a week ago. and yes i have an xcal3 but i dont know what im looking at on the data logging i don't have any experience with that. i know it can be done with the tuner but like i said doing that is like un charted territory for me.

Smoothgrandmama · October 14th, 2010, 10:26 PM

Check your air intake temp sensor

weems · October 15th, 2010, 10:13 PM

Originally Posted by burnout5.0

the car just has catback, CAI, 2.81 pulley and a dyno tune with a mustang dyno at EFI logics in CT. the car has had that setup for over a year now. and ive never had an issue. it started about a little less than a week ago. and yes i have an xcal3 but i dont know what im looking at on the data logging i don't have any experience with that. i know it can be done with the tuner but like i said doing that is like un charted territory for me.

Your fuel pump could very well be going bad. When you datalog check for the FPDC (Fuel Pump Duty Cycle) and if it hits .5 its maxed. Also look at your MAF counts and if it hits 1024 its maxed.

rk_2000_Z/28 · October 16th, 2010, 11:40 AM

Originally Posted by weems

Also look at your MAF counts and if it hits 1024 its maxed.

This is where I would start.

nyjetsfan4lif3 · October 26th, 2010, 03:10 PM

r ur spark plugs gapped properly?

Smoothgrandmama · October 26th, 2010, 04:52 PM

^^^ That is the next step

October 13th, 2010, 06:26 PM	#1
burnout5.0 Regular 2004 Mustang SVT Cobra 448whp/475wtq Join Date: Nov 2006 Location: Connecticut Posts: 368 iTrader: 0 reviews	sputtering under WOT okay so i have a 04 cobra and under WOT the car sputters pretty bad until about 1500 rpm before redline. i cant figure out for the life of me what it is. i replace the fuel filter, Fuel rail pressure sensor, spark plugs and i found a bad coil. still having the same issue after all of that. im tired of wasting money chasing this issue around. do you guys have any ideas??? please help me if you can. thanks. __________________ MM Cobra Club #78

October 13th, 2010, 06:36 PM	#2
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,742 iTrader: 1 reviews	When you let go of the gas, does it 'pop' a lot? have you checked the injectors? Sounds like a dirty/clogged or just bad injector. __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

October 13th, 2010, 06:43 PM	#3
burnout5.0 Regular 2004 Mustang SVT Cobra 448whp/475wtq Join Date: Nov 2006 Location: Connecticut Posts: 368 iTrader: 0 reviews	yeah i ran injector cleaner through the car as well but that stuff really doesnt do much. im just not gonna go and through like 500 dollars down for injectors if thats not the issue ive already thrown enough money away as it is. i just wish there was a way i could locate this issue without throwing random parts at it. and no theres no pop ittl just sputter pretty bad until i let off. the car runs perfectly fine under normal driving around town. its just when u hop on the highway and punch it, it just runs like garbage and sputters. __________________ MM Cobra Club #78

October 13th, 2010, 09:49 PM	#5
burnout5.0 Regular 2004 Mustang SVT Cobra 448whp/475wtq Join Date: Nov 2006 Location: Connecticut Posts: 368 iTrader: 0 reviews	the car just has catback, CAI, 2.81 pulley and a dyno tune with a mustang dyno at EFI logics in CT. the car has had that setup for over a year now. and ive never had an issue. it started about a little less than a week ago. and yes i have an xcal3 but i dont know what im looking at on the data logging i don't have any experience with that. i know it can be done with the tuner but like i said doing that is like un charted territory for me. __________________ MM Cobra Club #78 Last edited by burnout5.0; October 13th, 2010 at 09:53 PM.

October 14th, 2010, 10:26 PM	#6
Smoothgrandmama Assistant to the Manager 12 GT 8.46@88 1/8 Join Date: Apr 2007 Location: Willis,Texas Posts: 7,136 iTrader: 6 reviews	Check your air intake temp sensor __________________ Join The MM Facebook: Modded Mustangs Facebook Vote For Modded Mustangs Ride of the Month Eskimo Brothers To Smooth: Safi, Blitz34, Graystang01, WillTheThrill, Bwal, 101Fng

October 13th, 2010, 09:26 PM	#4
weems Tech Exchange Head Honcho 2003 SVT Cobra 11.70 @ 121 Join Date: Aug 2006 Location: Forsyth/Statesboro, GA Posts: 9,176 iTrader: 3 reviews	You might have a vacuum issue or unmetered air getting in there somewhere. Also could be a pegged fuel pump. Whats your mods? Do you have a tuner? Do some datalogging.

October 26th, 2010, 03:10 PM	#9
nyjetsfan4lif3 Regular 2003 svt cobra Join Date: Feb 2007 Location: sw fl Posts: 69 iTrader: 0 reviews	r ur spark plugs gapped properly? __________________ 2003 svt cobra - jlt rai , steeda 2.8 , diablo tune 06 gt -auto , 4.10 , udp , cams , lt headers , x pipe , axle back , cai , 93 oct tune , cmdp , twin 62 tb - sold

October 26th, 2010, 04:52 PM	#10
Smoothgrandmama Assistant to the Manager 12 GT 8.46@88 1/8 Join Date: Apr 2007 Location: Willis,Texas Posts: 7,136 iTrader: 6 reviews	^^^ That is the next step __________________ Join The MM Facebook: Modded Mustangs Facebook Vote For Modded Mustangs Ride of the Month Eskimo Brothers To Smooth: Safi, Blitz34, Graystang01, WillTheThrill, Bwal, 101Fng

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