Car wont start after injector swap PLEASE HELP

Chipdog · 11-11-2002, 04:16 PM

OK first off I have spark and I do have fuel pressure. I have tested with a noid light and it did not light up so the injectors are not being told to turn on. I have pulled apart the 10 pin and they are clean no corrations.
Where do I go from here?

Background
I just wapped to GT-40 heads and an Performer intake. I installed 30 lbs injectors but it was running too rich so I dropped down to 24s and now it wont start.

Thanks for the help
I just want to drive my car again its been too long
Chip

Coolbreeze · 11-11-2002, 11:00 PM

Did you hook the ground back up on the back of the head for the fuel injector harness??

MEDIK418 · 11-11-2002, 11:51 PM

Did you try resetting the computer?

Chipdog · 11-12-2002, 07:34 AM

I didn't unhook the ground but i will double check it.
The batterie was out of the car for a day so I assume the computer is reset.

I ran the codes and all i got was tps out of range and emisions crap.

Chevysucks · 11-13-2002, 08:57 AM

did you forget to reconnect the relay switch in the rear hatch of the car? i forgot to one time while changing injectors and it wouldn't start. hope this helps.

Chipdog · 11-14-2002, 05:53 PM

never popped it
I am getting fuel pressure just not getting the signal for the injectors to fire

MEDIK418 · 11-15-2002, 10:01 AM

If the battery was out of the car, it will still have the old computer settings unless you reset it. Do this. disconnect the ground cable from the battery, have someone turn on the key then touch the negative cable end to the positive. Hold this for say. . .ten seconds (count slow) This will reset the computer and it will have to relearn the engine, hopefully learning all the new settings as it goes.

Also, the TPS setting may be part of the problem. Try to set it as close to .99v as possible.

Chipdog · 11-16-2002, 10:18 PM

Seems it was the TPS. I unpluged it and it started right up. I was told that if it was shorted out and said it was at WOT then the computer wouldn't the the car start.
Thank you all for your help.

Chip

PKRWUD · 11-17-2002, 02:06 AM

Quote:

Originally posted by Chipdog
Seems it was the TPS. I unpluged it and it started right up. I was told that if it was shorted out and said it was at WOT then the computer wouldn't the the car start.
Thank you all for your help.

Chip

I wish I had read this thread sooner! You are right, when the TPS tells the ECM it's at WOT during startup, the ECM assumes that's because it's flooded, and shuts off the injector pulse until it determines that the engine has fired, or is no longer at WOT.

Take care,
~Chris

11-11-2002, 04:16 PM	#1
Chipdog Registered Member Join Date: Apr 1999 Location: Miami,Fl USA Posts: 297	Car wont start after injector swap PLEASE HELP OK first off I have spark and I do have fuel pressure. I have tested with a noid light and it did not light up so the injectors are not being told to turn on. I have pulled apart the 10 pin and they are clean no corrations. Where do I go from here? Background I just wapped to GT-40 heads and an Performer intake. I installed 30 lbs injectors but it was running too rich so I dropped down to 24s and now it wont start. Thanks for the help I just want to drive my car again its been too long Chip __________________ 92 GT Convertible Hooker Headers, Headman X pipe, Flow Masters, 4.10s, BBK 1.5 drop, 73mm Mass air, 65 FMS TB, FMS Aluminum radiator, T-5 swap with a Steeda shifter. And a 9 pound Blow Job

11-11-2002, 11:00 PM	#2
Coolbreeze Registered Member Join Date: Oct 2000 Location: ~Columbus~GA~31909~ Posts: 156	Did you hook the ground back up on the back of the head for the fuel injector harness?? __________________ Mike Blown~AOD'ed~331~ T-top~ 86GT Check out car on my page here ------ > ~~My 86GT T-top ~~

11-11-2002, 11:51 PM	#3
MEDIK418 Registered Member Join Date: Mar 1999 Location: Amarillo, Texas, USA Posts: 780	Did you try resetting the computer? __________________ 1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet. Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.

11-12-2002, 07:34 AM	#4
Chipdog Registered Member Join Date: Apr 1999 Location: Miami,Fl USA Posts: 297	I didn't unhook the ground but i will double check it. The batterie was out of the car for a day so I assume the computer is reset. I ran the codes and all i got was tps out of range and emisions crap. __________________ 92 GT Convertible Hooker Headers, Headman X pipe, Flow Masters, 4.10s, BBK 1.5 drop, 73mm Mass air, 65 FMS TB, FMS Aluminum radiator, T-5 swap with a Steeda shifter. And a 9 pound Blow Job

11-13-2002, 08:57 AM	#5
Chevysucks Registered Member Join Date: Mar 2000 Location: Stroudsburg, PA, USA Posts: 150	did you forget to reconnect the relay switch in the rear hatch of the car? i forgot to one time while changing injectors and it wouldn't start. hope this helps. __________________ 88 Stang 306 ci. GT Mustang heads- ported and polished/milled---Soon to be AFR 185cc 1.7 crane roller rockers/extra hardened pushrods FRPP X-303 Cam Stock Intake-1 inch intake spacer BBK Cold Air Induction Stock Injectors--going to 24 pounders BBK Full Length Headers Mac 2.5 inch Cat-Back 8 Point Cage Sub Frame Connectors World Class T-5 Steeda Shift Cable,Quadrant,Firewall adjuster King Cobra Clutch Pro 5.0 Shifter Alunimum Driveshaft/ Drive shaft loop Kenny Brown suspension 3.55 gears

11-14-2002, 05:53 PM	#6
Chipdog Registered Member Join Date: Apr 1999 Location: Miami,Fl USA Posts: 297	never popped it I am getting fuel pressure just not getting the signal for the injectors to fire __________________ 92 GT Convertible Hooker Headers, Headman X pipe, Flow Masters, 4.10s, BBK 1.5 drop, 73mm Mass air, 65 FMS TB, FMS Aluminum radiator, T-5 swap with a Steeda shifter. And a 9 pound Blow Job

11-15-2002, 10:01 AM	#7
MEDIK418 Registered Member Join Date: Mar 1999 Location: Amarillo, Texas, USA Posts: 780	If the battery was out of the car, it will still have the old computer settings unless you reset it. Do this. disconnect the ground cable from the battery, have someone turn on the key then touch the negative cable end to the positive. Hold this for say. . .ten seconds (count slow) This will reset the computer and it will have to relearn the engine, hopefully learning all the new settings as it goes. Also, the TPS setting may be part of the problem. Try to set it as close to .99v as possible. __________________ 1986 four-eyed LX coupe, 358 Cleveland, Tremec TKO600/centerforce clutch, dish cut Probe forged pistons, comp cams hyd.roller cam, .579/.588@224/230, Edel.performer, 670 holley street avenger, CPR custom built long tubes, ported and polished 4bbl heads, manley valves, beehive springs, MSD peo-billet dist/MSD6AL, fluidamper, 5 lug conv. with 17x8 bullits there's more but it's still not finished yet. Oh, and the oldest boy is turning his 89 GT into a FFR cobra this next summer.

11-16-2002, 10:18 PM	#8
Chipdog Registered Member Join Date: Apr 1999 Location: Miami,Fl USA Posts: 297	Fixed Seems it was the TPS. I unpluged it and it started right up. I was told that if it was shorted out and said it was at WOT then the computer wouldn't the the car start. Thank you all for your help. Chip __________________ 92 GT Convertible Hooker Headers, Headman X pipe, Flow Masters, 4.10s, BBK 1.5 drop, 73mm Mass air, 65 FMS TB, FMS Aluminum radiator, T-5 swap with a Steeda shifter. And a 9 pound Blow Job

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