Car won't start most of the time. When it does will only run for few minutes.

Tiny
MLEVENS
  • MEMBER
  • 1995 EAGLE TALON
  • 120,000 MILES
It all started with a hesitation about a year ago. Then the end of december it started shutting off at an idle and while driving. Most time I could wait about 20 minutes or so and it would start back up. It may run for a few miles or most of a day. One time I could start it back up right away. That only happened once. I have replaced the fuel pump and relay, automatic shutdown relay, injectors, idle air control, throttle positioning sensor, crankshaft positioning sensor, and the ecm. The ecm and crank sensor were replaced in the last week. The cam sensor is about 2 years old. It would be the oldest. I am losing the ground for the asd relay from the ecm. That is why I thought the ecm was bad. Now it will not run for more than a few minutes then it shuts off and I have no idea when it will start again. It is to the point now that it could be a few days before it starts then it will only run for a few minutes. I have taken out the entire engine wiring harness and fixed every little scrape and cut insulation I could find. Looking for ideas on what to check next.
Sunday, February 12th, 2012 AT 1:23 AM

7 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Next time it refuses to start check fuel and spark immediately
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Sunday, February 12th, 2012 AT 1:26 AM
Tiny
MLEVENS
  • MEMBER
  • 6 POSTS
It does not have spark, fuel pressure is good. I lose the ground to the asd relay from the ecm.
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Sunday, February 12th, 2012 AT 2:12 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Have you tested the coil if it checks out -have the computer tested-
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Sunday, February 12th, 2012 AT 2:27 AM
Tiny
MLEVENS
  • MEMBER
  • 6 POSTS
Yes I have tested the coil and replaced it. I have no power to the coil when it won't start. I just put another new computer in it today. I replaced the other one at the end of december. All the tests I did pointed to the computer being bad, but that was not the case.
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Sunday, February 12th, 2012 AT 2:37 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
The ASD relay powers the coil
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Sunday, February 12th, 2012 AT 3:05 AM
Tiny
MLEVENS
  • MEMBER
  • 6 POSTS
I know it powers the coil. It seems like the ecm is sensing something and taking away the ground for the asd. I have already replaced the asd and fuel pump relay. When it will start I have a ground atn the red/ white wire when you try to start. It goes directly to the ecm. There is no ground uuntil you turn the key to start. Which is the way it is supposed to be. I have tried all of the obvious stuff and replaced pretty much everthing. Any more ideas.
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Sunday, February 12th, 2012 AT 10:28 AM
Tiny
TINBENDER59
  • MEMBER
  • 1 POST
I am an electronics tech by trade, I have been assisting a friend with his Talon. I have bypassed the fuel relay, replaced the ignition switch (not the tumbler). Then it occurred to me that I was going about it wrong, I should be looking at the system ground's. Started searching the grounds out, low and behold, they are not to be found? I am a GM man, all of GM's grounds are on the motor. So this left me wondering. And here I am, on your site. My next move is simple, find the system grounds at the ECU, splice into them, then run a jumper directly to the battery (-) post. I believe our schematic shows them all. I will keep you posted.
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Monday, March 12th, 2012 AT 5:29 AM

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