HELP!!!!!!!!!!!!!!!!!!!

mustangbob19 · 04-04-2001, 05:38 PM

My 90 GT will start for about two seconds and then die! I recently had the upper manifold off to polish it, but the car ran perfect before the manifold was taken off and AFTER it was put back on about a month ago. I checked the fuel pressure and it would go to 35-38 pounds of pressure. I just replaced the battery also. Any help would be greatly appreciated!!! Thank You!

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90 Mustang GT (hatchback)
3.55's, dyno-max exhaust,
Mac Cold Air Induction

Green92LX · 04-04-2001, 05:52 PM

Sounds like your IAC is not functioning. Take it off and clean it or give it a love tap. If the IAC isn't operating, then the car is getting choked at idle. Does it only do it when its cold?????

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1992 LX:V-1 S-Trim ,Edelbrock 6037 Heads,Cobra Intake,E-303,1.6 Rollers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP,24 lb injectors,MSD 6A and BTM,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers,Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors,Ponies w/ 225/50 Nitto NT 450's on front,255/50 BFG Drags out back,93 Cobra Spoiler
Daily driver 89 Coupe:BBK shorties,offroad,flowturds with dumps,soon to be cyber green

mustangbob19 · 04-04-2001, 06:52 PM

This is the first time this has ever happened.

------------------
90 Mustang GT (hatchback)
3.55's, dyno-max exhaust,
Mac Cold Air Induction

slo95 · 04-04-2001, 07:57 PM

Does that TFI module have anything to do with it?

mustangbob19 · 04-05-2001, 05:37 PM

I don't know. Anyone else have an opinion?

------------------
90 Mustang GT (hatchback)
3.55's, dyno-max exhaust,
Mac Cold Air Induction

jimberg · 04-05-2001, 05:41 PM

What have you done to your car recently? Have you been looking at stuff under the hood? Have you disconnected and reconnected things? Can you keep it running if you depress the accelerator? Think back and give us some more clues.

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351W 89 Mustang GT Convertible

mustangbob19 · 04-05-2001, 06:34 PM

I have been looking at stuff recently but i haven't unhooked anything. If I hit the gas when i start it the rpms shoot up but it still dies right away.

------------------
90 Mustang GT (hatchback)
3.55's, dyno-max exhaust,
Mac Cold Air Induction

93CobraR · 04-05-2001, 07:34 PM

Sounds like a vaccume leak. Cheak ALL the hoses, make sure you got the PCV hose in, and large hose is on the brake vacuume tree in the back. Good Luck

------------------
87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's.
Best time 12.96
Best MPH 103.42
Best 60' 1.695

Visit my site at:
http://www.geocities.com/cobrar93_2000/MyPage.html

slider · 04-05-2001, 10:40 PM

yeah, check the hoses under the manifold. maybe the MAP sensor hose its disconnected

mustangbob19 · 04-05-2001, 11:16 PM

The car did run perfectly after i installed the upper manifold. It sat for two weeks after i ran the car, then it didn't start. I checked all the hoses that connect to the upper manifold and they look fine.

------------------
90 Mustang GT (hatchback)
3.55's, dyno-max exhaust,
Mac Cold Air Induction

Godslayer · 04-05-2001, 11:19 PM

When you try to start it, instead of just letting go of the key, after it cranks over, move it back or forward and see if it stays running. Try moving it a little each way... or when you are driving and see if the car dies. I had that problem and the lock cylinder was bad. It took me a month to find out what it was. At first the car would start and die in 2 seconds just like yours is doing. Then it started dying when I was driving... it was the weirdest thing I'd ever seen. Also when it dies after two seconds, check the fuel pressure and see if it's there. I have a feeling the lock cylinder is bad. Good luck.

------------------
87 GT
Full exhaust, K&N, KB Subs, BBK STB, homeade dumps...

87 Taurus
New York
Winters Bite!

jimberg · 04-06-2001, 07:16 AM

Yes, I went through what Godslayer is talking about. There's nothing scarier than your car just dying at highway speed when it's snowing.

Have you done a quick test to see if you have any codes?

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351W 89 Mustang GT Convertible

mustangbob19 · 04-06-2001, 09:27 AM

there is fuel pressure of about 35 lbs. when i try to start the car. Explain more about this "lock cylinder". Thanks Guys.

------------------
90 Mustang GT (hatchback)
3.55's, dyno-max exhaust,
Mac Cold Air Induction

mustangbob19 · 04-06-2001, 09:30 AM

I also thought the car had to warmed up to normal operating temp. to check for codes.

------------------
90 Mustang GT (hatchback)
3.55's, dyno-max exhaust,
Mac Cold Air Induction

jimberg · 04-06-2001, 02:34 PM

The quick test just runs a bunch of test before the car even starts. It will give you the codes that just occurred during the quick test and will also give you codes that have been stored in keep-alive memory. If you have a defective or dead system, the quick test should tell you what it is.

It can be stone cold to do the test. Timing and cylinder balance tests are another deal.

------------------
351W 89 Mustang GT Convertible

jimberg · 04-06-2001, 02:39 PM

If you have a bunch of keys and your keys weigh a good amount, they can cause your ignition switch to disengage killing the car. Did you ever have problems when the car would seem to die when you were driving? Kind of like a stumble and then it would restart if you have a 5 speed. It may happen so fast that you don't even notice it.

------------------
351W 89 Mustang GT Convertible

mustangbob19 · 04-06-2001, 06:06 PM

Thanks guys. I got the car running!!!! The previous owner installed an alarm, but did a sh!@# job of wiring it. I traced the wires and found one that had come loose. Thanks again!

04-04-2001, 05:38 PM	#1
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	HELP!!!!!!!!!!!!!!!!!!! My 90 GT will start for about two seconds and then die! I recently had the upper manifold off to polish it, but the car ran perfect before the manifold was taken off and AFTER it was put back on about a month ago. I checked the fuel pressure and it would go to 35-38 pounds of pressure. I just replaced the battery also. Any help would be greatly appreciated!!! Thank You! ------------------ 90 Mustang GT (hatchback) 3.55's, dyno-max exhaust, Mac Cold Air Induction

04-04-2001, 05:52 PM	#2
Green92LX Registered Member Join Date: Jun 1999 Location: North Haven,CT Posts: 336	Sounds like your IAC is not functioning. Take it off and clean it or give it a love tap. If the IAC isn't operating, then the car is getting choked at idle. Does it only do it when its cold????? ------------------ 1992 LX:V-1 S-Trim ,Edelbrock 6037 Heads,Cobra Intake,E-303,1.6 Rollers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP,24 lb injectors,MSD 6A and BTM,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers,Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors,Ponies w/ 225/50 Nitto NT 450's on front,255/50 BFG Drags out back,93 Cobra Spoiler Daily driver 89 Coupe:BBK shorties,offroad,flowturds with dumps,soon to be cyber green

04-04-2001, 06:52 PM	#3
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	This is the first time this has ever happened. ------------------ 90 Mustang GT (hatchback) 3.55's, dyno-max exhaust, Mac Cold Air Induction

04-04-2001, 07:57 PM	#4
slo95 Registered Member Join Date: Dec 2000 Posts: 168	Does that TFI module have anything to do with it?

04-05-2001, 05:37 PM	#5
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	I don't know. Anyone else have an opinion? ------------------ 90 Mustang GT (hatchback) 3.55's, dyno-max exhaust, Mac Cold Air Induction

04-05-2001, 05:41 PM	#6
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	What have you done to your car recently? Have you been looking at stuff under the hood? Have you disconnected and reconnected things? Can you keep it running if you depress the accelerator? Think back and give us some more clues. ------------------ 351W 89 Mustang GT Convertible

04-05-2001, 06:34 PM	#7
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	I have been looking at stuff recently but i haven't unhooked anything. If I hit the gas when i start it the rpms shoot up but it still dies right away. ------------------ 90 Mustang GT (hatchback) 3.55's, dyno-max exhaust, Mac Cold Air Induction

04-05-2001, 07:34 PM	#8
93CobraR Registered Member Join Date: Oct 1999 Location: Cincinnati, Ohio Posts: 1,575	Sounds like a vaccume leak. Cheak ALL the hoses, make sure you got the PCV hose in, and large hose is on the brake vacuume tree in the back. Good Luck ------------------ 87 GT, 4 inch cowl hood,17x9 Cobra R's/255/45's,GT-40 heads,long tubes headers,h-pipe,Flows,BBK cold air, Mass air,70mm MAF, 1.7's, 1" spacer,underdrive pulleys,Pro 5.0, King Cobra, Adj. fuel Reg., Lakewood Lift Bars,50/50's,subframes, 4.10's. Best time 12.96 Best MPH 103.42 Best 60' 1.695 Visit my site at: http://www.geocities.com/cobrar93_2000/MyPage.html

04-05-2001, 10:40 PM	#9
slider Registered Member Join Date: Mar 2001 Location: San Diego, CA, USA Posts: 86	yeah, check the hoses under the manifold. maybe the MAP sensor hose its disconnected

04-05-2001, 11:16 PM	#10
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	The car did run perfectly after i installed the upper manifold. It sat for two weeks after i ran the car, then it didn't start. I checked all the hoses that connect to the upper manifold and they look fine. ------------------ 90 Mustang GT (hatchback) 3.55's, dyno-max exhaust, Mac Cold Air Induction

04-05-2001, 11:19 PM	#11
Godslayer Registered Member Join Date: Mar 1999 Location: Largo, FL USA Posts: 274	When you try to start it, instead of just letting go of the key, after it cranks over, move it back or forward and see if it stays running. Try moving it a little each way... or when you are driving and see if the car dies. I had that problem and the lock cylinder was bad. It took me a month to find out what it was. At first the car would start and die in 2 seconds just like yours is doing. Then it started dying when I was driving... it was the weirdest thing I'd ever seen. Also when it dies after two seconds, check the fuel pressure and see if it's there. I have a feeling the lock cylinder is bad. Good luck. ------------------ 87 GT Full exhaust, K&N, KB Subs, BBK STB, homeade dumps... 87 Taurus New York Winters Bite!

04-06-2001, 07:16 AM	#12
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	Yes, I went through what Godslayer is talking about. There's nothing scarier than your car just dying at highway speed when it's snowing. Have you done a quick test to see if you have any codes? ------------------ 351W 89 Mustang GT Convertible

04-06-2001, 09:27 AM	#13
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	there is fuel pressure of about 35 lbs. when i try to start the car. Explain more about this "lock cylinder". Thanks Guys. ------------------ 90 Mustang GT (hatchback) 3.55's, dyno-max exhaust, Mac Cold Air Induction

04-06-2001, 09:30 AM	#14
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	I also thought the car had to warmed up to normal operating temp. to check for codes. ------------------ 90 Mustang GT (hatchback) 3.55's, dyno-max exhaust, Mac Cold Air Induction

04-06-2001, 02:34 PM	#15
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	The quick test just runs a bunch of test before the car even starts. It will give you the codes that just occurred during the quick test and will also give you codes that have been stored in keep-alive memory. If you have a defective or dead system, the quick test should tell you what it is. It can be stone cold to do the test. Timing and cylinder balance tests are another deal. ------------------ 351W 89 Mustang GT Convertible

04-06-2001, 02:39 PM	#16
jimberg Registered Member Join Date: Oct 1998 Location: Rogers, MN Posts: 2,089	If you have a bunch of keys and your keys weigh a good amount, they can cause your ignition switch to disengage killing the car. Did you ever have problems when the car would seem to die when you were driving? Kind of like a stumble and then it would restart if you have a 5 speed. It may happen so fast that you don't even notice it. ------------------ 351W 89 Mustang GT Convertible

04-06-2001, 06:06 PM	#17
mustangbob19 Registered Member Join Date: Sep 2000 Location: Minnesota Posts: 125	Thanks guys. I got the car running!!!! The previous owner installed an alarm, but did a sh!@# job of wiring it. I traced the wires and found one that had come loose. Thanks again!