Timing Problem at WOT

Cody2552 · 11-17-2002, 10:55 PM

Recently i installed a set of 4.10's for my 87 5.0 It was running very well at WOT with the stock 2.73's. Now when i want to get on it it sortas stops at a certain RPM around 3000-4000. i have tried retiming it and adjusting the fuel pressure. Please help...

many other mods on the motor

PKRWUD · 11-18-2002, 04:35 AM

What exactly happens? Does it detonate? Does it just fall flat? What does it do? What rpms did you take it to before? What else did you do? What's been done?

Cody2552 · 11-18-2002, 02:08 PM

Well when i take it to the strip i shift at around 5000 - 6000 rpms. it was accelerating quite nice. i have a rebuilt 302 bored to 306 with new pistons 10.1 ratio holley systemax II upper and lower intake, 75mm throttlebody 75 egrspacer, longtube headers short h-pipe, and flowmaster catbacks, cold air intake, 75mm mass air 24lb injectors, fuel pressure regulator, stock t5, and king cobra clutch, fully ported and polished e7 heads.

it gets a certain rpm then it just stays their and doesn't want to go past it when i mash the pedal down. i am thinking its the WOT timing in the computer....???

95mustanggt · 11-18-2002, 03:05 PM

So all you did was add the gears?

Cody2552 · 11-18-2002, 03:29 PM

Cody2552 · 11-18-2002, 09:47 PM

well i thinking that the coil is going out, because on a cold start it takes forever to get it going when the starter is still turing its brains out, lol. help if ya can

PKRWUD · 11-18-2002, 09:57 PM

Sounds like a coil issue, but you should check your fuel pressure to be safe.

Take care,
~Chris

Cody2552 · 11-18-2002, 10:03 PM

i have been adjusting fuel pressure to get more power but i went back to 32psi -30psi

PKRWUD · 11-18-2002, 10:05 PM

What happens to the pressure when you shut off the engine?

Cody2552 · 11-18-2002, 10:08 PM

it slowly drops to 0. i forgot to mention i have a bbk inline fuel pump

PKRWUD · 11-18-2002, 10:10 PM

Well, it shouldn't move at all for a few minutes (10 to 15). If it's dropping faster than that, you have a problem, and you need to figure it out. Either your injectors are leaking, or there is a crack in the pick up tube in the tank, or, a bad regulator.

Cody2552 · 11-18-2002, 10:13 PM

the injectors aren't leaking out the manifold the regulator isn't leaking. maybe in the tank

Jeff Chambers · 11-19-2002, 08:01 AM

Don't forget about valve float. If you've got old worn out springs or springs too light for the cam you're running, you could be getting valve float that's keeping the engine from revving any higher.

Cody2552 · 11-19-2002, 08:18 AM

thanks for the advice. i have already threw 2 valves , but li am very lucky no piston or head damage, i got all the keeperps replaced as well as the springs and rockers, with new push rods and lifters

Jeff Chambers · 11-19-2002, 10:32 AM

What were your installed springs pressures (e.g. on the seat and at max lift)?

11-17-2002, 10:55 PM	#1 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	Timing Problem at WOT Recently i installed a set of 4.10's for my 87 5.0 It was running very well at WOT with the stock 2.73's. Now when i want to get on it it sortas stops at a certain RPM around 3000-4000. i have tried retiming it and adjusting the fuel pressure. Please help... many other mods on the motor

11-18-2002, 04:35 AM	#2 (permalink)
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	What exactly happens? Does it detonate? Does it just fall flat? What does it do? What rpms did you take it to before? What else did you do? What's been done? __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-18-2002, 03:05 PM	#4 (permalink)
95mustanggt Mustang is Parked :( Join Date: May 2000 Location: Kamloops, BC Posts: 2,874	So all you did was add the gears? __________________ 1995 Mustang GT 2005 F150 FX4 Super Crew RiceHatersClub.com

11-18-2002, 03:29 PM	#5 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	yes

11-18-2002, 09:57 PM	#7 (permalink)
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Sounds like a coil issue, but you should check your fuel pressure to be safe. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-18-2002, 02:08 PM	#3 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	Well when i take it to the strip i shift at around 5000 - 6000 rpms. it was accelerating quite nice. i have a rebuilt 302 bored to 306 with new pistons 10.1 ratio holley systemax II upper and lower intake, 75mm throttlebody 75 egrspacer, longtube headers short h-pipe, and flowmaster catbacks, cold air intake, 75mm mass air 24lb injectors, fuel pressure regulator, stock t5, and king cobra clutch, fully ported and polished e7 heads. it gets a certain rpm then it just stays their and doesn't want to go past it when i mash the pedal down. i am thinking its the WOT timing in the computer....???

11-18-2002, 09:47 PM	#6 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	well i thinking that the coil is going out, because on a cold start it takes forever to get it going when the starter is still turing its brains out, lol. help if ya can

11-18-2002, 10:03 PM	#8 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	i have been adjusting fuel pressure to get more power but i went back to 32psi -30psi

11-18-2002, 10:05 PM	#9 (permalink)
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	What happens to the pressure when you shut off the engine? __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-18-2002, 10:08 PM	#10 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	it slowly drops to 0. i forgot to mention i have a bbk inline fuel pump

11-18-2002, 10:10 PM	#11 (permalink)
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Well, it shouldn't move at all for a few minutes (10 to 15). If it's dropping faster than that, you have a problem, and you need to figure it out. Either your injectors are leaking, or there is a crack in the pick up tube in the tank, or, a bad regulator. __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

11-18-2002, 10:13 PM	#12 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	the injectors aren't leaking out the manifold the regulator isn't leaking. maybe in the tank

11-19-2002, 08:01 AM	#13 (permalink)
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Don't forget about valve float. If you've got old worn out springs or springs too light for the cam you're running, you could be getting valve float that's keeping the engine from revving any higher. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

11-19-2002, 08:18 AM	#14 (permalink)
Cody2552 Registered Member Join Date: Nov 2002 Posts: 68	thanks for the advice. i have already threw 2 valves , but li am very lucky no piston or head damage, i got all the keeperps replaced as well as the springs and rockers, with new push rods and lifters

11-19-2002, 10:32 AM	#15 (permalink)
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	What were your installed springs pressures (e.g. on the seat and at max lift)? __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

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