Power loss at 4300 rpm need help please

Badass_yellowGT · 07-19-2003, 08:38 PM

hey all
i have this dam problem that is driving me nuts i have been working on stangs for years and this is a first here is my problem

when i accelerate hard in 1st,2nd,3rd, i have plenty of power up till 4300 rpm at this point it seems like the clutch is slipping or the engine is dropping off some time because of knock but i don`t hear any. but it will not do it if i accelerate slowy like normal driving .i won`t have the problem it almost feels like hesitation but the power comes back on when i hit 5000 rpm`s. sometimes

i have done a bit of work on my motor but this is got me stumped
these are my engine mods
2002 pi heads and intake only run 93 octane
mac cai
autolight platinum plugs
holley laser shot wires
under drive pullies
accell coil packs
frpp headers with full flowmaster exhaust and high flow h-pipe with
cats

the clutch is stock and looks alright

please any help would be great if anybody has ever experianced this problem or knows of a fix.

9646GT · 07-22-2003, 04:34 AM

what about that fuel pump.. is it aftermarket? Have you completely checked out the fuel system? If you remember I had power loass and replaced fuel pump and it turned it back into a beast.

Badass_yellowGT · 07-22-2003, 06:54 PM

i have been doing some testing and it only happens when the cxar is completely warmed up to operating temp. i`m beggining to think is a timeing issue the fuel system have been completely check. i`m gonna try to cool the car down some more with new coolant, lower stat, and better fan to see if it helps i want to get a tune done but the closet place to me is 100 miles away.

91LX2Bfast · 07-23-2003, 06:15 PM

First thing I would do is put some copper plugs in there.

Badass_yellowGT · 07-25-2003, 03:12 PM

thanks for all the help it was the plugs i got a colder plug and better thermostate and it seems to have fixed it.car has more power now to feels like

a big thanks to juiced4.6 for the help

07-19-2003, 08:38 PM	#1
Badass_yellowGT Registered Member Join Date: Jun 2002 Location: Western,MA Posts: 254	Power loss at 4300 rpm need help please hey all i have this dam problem that is driving me nuts i have been working on stangs for years and this is a first here is my problem when i accelerate hard in 1st,2nd,3rd, i have plenty of power up till 4300 rpm at this point it seems like the clutch is slipping or the engine is dropping off some time because of knock but i don`t hear any. but it will not do it if i accelerate slowy like normal driving .i won`t have the problem it almost feels like hesitation but the power comes back on when i hit 5000 rpm`s. sometimes i have done a bit of work on my motor but this is got me stumped these are my engine mods 2002 pi heads and intake only run 93 octane mac cai autolight platinum plugs holley laser shot wires under drive pullies accell coil packs frpp headers with full flowmaster exhaust and high flow h-pipe with cats the clutch is stock and looks alright please any help would be great if anybody has ever experianced this problem or knows of a fix. __________________ Rice Haters Club Member #55 For My car Specs Click the Home page link http://www.badassyellowgt.50g.com/

07-22-2003, 04:34 AM	#2
9646GT Registered Member Join Date: May 2003 Location: WV Posts: 24	what about that fuel pump.. is it aftermarket? Have you completely checked out the fuel system? If you remember I had power loass and replaced fuel pump and it turned it back into a beast. __________________ 1996 GT 4.6

07-22-2003, 06:54 PM	#3
Badass_yellowGT Registered Member Join Date: Jun 2002 Location: Western,MA Posts: 254	i have been doing some testing and it only happens when the cxar is completely warmed up to operating temp. i`m beggining to think is a timeing issue the fuel system have been completely check. i`m gonna try to cool the car down some more with new coolant, lower stat, and better fan to see if it helps i want to get a tune done but the closet place to me is 100 miles away. __________________ Rice Haters Club Member #55 For My car Specs Click the Home page link http://www.badassyellowgt.50g.com/

07-23-2003, 06:15 PM	#4
91LX2Bfast Registered Member Join Date: Dec 1999 Location: Warrington, PA Posts: 694	First thing I would do is put some copper plugs in there. __________________ '97 T-bird LX 4.6L 2V, auto SVO heads/intake, Vortech T-trim, front mounted intercooler, blower cams, Cobra crank, Manley H-beam rods, JE pistons, Aeromotive fuel system w/ 42# injectors, and much more No times yet

07-25-2003, 03:12 PM	#5
Badass_yellowGT Registered Member Join Date: Jun 2002 Location: Western,MA Posts: 254	thanks for all the help it was the plugs i got a colder plug and better thermostate and it seems to have fixed it.car has more power now to feels like a big thanks to juiced4.6 for the help __________________ Rice Haters Club Member #55 For My car Specs Click the Home page link http://www.badassyellowgt.50g.com/

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