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Old 11-29-2010, 09:59 AM   #1
TheKid!!
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Default PLS Help! '87 cutting off! ???

Last week my 87: which has been sitting for over 6 yrs got down to the reserve fuel in the gas tank; at which point it promptly died on the highway and would not restart. I HAD TO HAVE IT TOWED to my home. Once there I filled it with super - gas and it seemed to be OK.
The next day while going to work (after driving for about 20 - 30 mins) it died again. Now I added dry gas and fuel injector cleaned as well. While driving it died again. I had the fuel pump and 2 filters changed -but the still does the same thing after driving for about 30 mins. It will die, crank - strong - but not start and run. I have to let it sit for about 2 hours at least, before it will start again. Any idea?!!!

Last edited by TheKid!!; 11-29-2010 at 01:16 PM. Reason: Typo
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Old 11-29-2010, 03:15 PM   #2
usmc_butler
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Sounds like it is something in the distributor or firing, when the car gets warm it shuts down. I've heard of the coil doing this. Just my .02c
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Old 11-29-2010, 03:18 PM   #3
WW7
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It sounds like the ignition control module or the coil. These are both heat sensitive and what you are discribing is exactly the way most go bad...WW
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Old 11-29-2010, 03:22 PM   #4
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When it shuts off is it sudden like tou switched it off or does it sputter as it shuts down? Do you see the SES ( Check Engine) light indicating fault codes have been set?
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Old 11-29-2010, 04:06 PM   #5
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Quote:
Originally Posted by TheKid!! View Post
Last week my 87: which has been sitting for over 6 yrs got down to the reserve fuel in the gas tank; at which point it promptly died on the highway and would not restart. I HAD TO HAVE IT TOWED to my home. Once there I filled it with super - gas and it seemed to be OK.
The next day while going to work (after driving for about 20 - 30 mins) it died again. Now I added dry gas and fuel injector cleaned as well. While driving it died again. I had the fuel pump and 2 filters changed -but the still does the same thing after driving for about 30 mins. It will die, crank - strong - but not start and run. I have to let it sit for about 2 hours at least, before it will start again. Any idea?!!!
I am restoring my 85. It had a similar problem.
I replaced the relay... run for awhile then die. Testing suggested a bad fuel pump.. replaced that....

Same thing car would run for awhile then die as if someone had turned it off. Crank no start. Good spark, zero fuel pressure. It turned out to be a crimped wire at the fuel pump connection at the fuel tank.... check your wiring that new pigtail is about 50 bucks at your parts store..

thats my 2 cents....

c4 cowboy.

Last edited by C4Cowboy; 11-29-2010 at 04:14 PM.
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Old 11-30-2010, 12:04 AM   #6
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maybe your cagameter needs adjusting. I've heard that a full blinker fluid reservoir fixes it as well

Last edited by coupeguy2001; 11-30-2010 at 08:47 AM.
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Old 11-30-2010, 07:28 AM   #7
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bad cagameter
but i would try another coil and ignition module each time to see which one's failing
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Old 11-30-2010, 09:13 AM   #8
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Quote:
Originally Posted by coupeguy2001 View Post
maybe your cagameter needs adjusting. I've heard that a full blinker fluid reservoir fixes it as well
I think you're wrong. Every time this happened to me the flux capacitor was out of sink.




.....but seriously, I would check spark. Sounds like ignition module with out being there to run tests.
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Old 11-30-2010, 09:18 AM   #9
TheKid!!
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Sudden. No SES as I recall... Thanks...
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Old 11-30-2010, 10:46 AM   #10
c4cruiser
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Have you checked fuel pressure? Even with a new filter and pump, if the car sat for that time and you got it down to the reserve level, it's possible that the pump picked up debris from the bottom of the tank and is blocking the line somewhere.

Pull any codes stored in the ECM. If the FP is not getting sufficient voltage or if the FP relay is bad, a Code 54 will be set. The SES light may come on initially when low voltage is seen, but the light will go off once voltage returns to normal.
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Old 11-30-2010, 12:27 PM   #11
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Quote:
Originally Posted by TheKid!! View Post
Last week my 87: which has been sitting for over 6 yrs got down to the reserve fuel in the gas tank; at which point it promptly died on the highway and would not restart. I HAD TO HAVE IT TOWED to my home. Once there I filled it with super - gas and it seemed to be OK.
The next day while going to work (after driving for about 20 - 30 mins) it died again. Now I added dry gas and fuel injector cleaned as well. While driving it died again. I had the fuel pump and 2 filters changed -but the still does the same thing after driving for about 30 mins. It will die, crank - strong - but not start and run. I have to let it sit for about 2 hours at least, before it will start again. Any idea?!!!
It could be that your pump was on it's last legs or your ignition module. I am VERY hesitant to say module because I don't know for sure. You see, I have a small cap and a divorced coil. You don't have that setup but when my module was going, that was what it did.

If you have changed the pump, it could be a bad pump or a bad power source. IDK. When you changed the pump, I would ASSUME that you changed the sock? Did you? If so, hook up a noid light to the fuel pump harness so you can see what it is doing at the time. Could also be your relay to the FP. Not sure

Also when it is dead, check if you have spark. My module would work but especially when we went thru a car wash, it would die out. Again, that wasn't the whole thing and I did have a little leak in the wires. Changed wires and no improvement at the car wash. Changed module and life was good again.
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Old 11-30-2010, 03:25 PM   #12
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Sudden shut off generally points to ignition. My first guess would be the module. Would be nice to see if any codes are set.
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Old 11-30-2010, 03:30 PM   #13
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Quote:
Originally Posted by Muffin View Post
Sudden shut off generally points to ignition. My first guess would be the module. Would be nice to see if any codes are set.
Didn't set a code when mine went south
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Old 11-30-2010, 03:44 PM   #14
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Quote:
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I have a small cap and a divorced coil.
small cap (camaro style) HEI and big cap (vette) HEI both suffer ignition module frailty...small caps also frequent no-fly due to soft pick-up assy, better to get the 'reman' small cap with 'big cap style pick-up' from napa for ~$111, if ya gotta run small.


FIRST TEST for ANY efi drive prob is FUEL PRESSURE...but if PO wants to 'shoot first,ask later', try a 'known good' ign module in the distrib.
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Old 11-30-2010, 11:47 PM   #15
C4Cowboy
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Default Okay Im an NG too!

Quote:
Originally Posted by coupeguy2001 View Post
maybe your cagameter needs adjusting. I've heard that a full blinker fluid reservoir fixes it as well
It sounds as if the cagameter might be like changing the oil in my tires
or rotating my oil but im unclear... please clarify.... lol!

c4cowboy
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Old 12-02-2010, 04:29 PM   #16
corvetteharley
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Default Just a thought

I've taken my ignition control module to O'Reillys auto parts they tested it for me for free just a thought to rule that out for you I'd call and ask first if you try it hope this helps you.
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Old 12-02-2010, 04:36 PM   #17
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Quote:
Originally Posted by corvetteharley View Post
I've taken my ignition control module to O'Reillys auto parts they tested it for me for free just a thought to rule that out for you I'd call and ask first if you try it hope this helps you.
They ruled mine out too but when replaced, the hesitation problem disappeared.
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Old 02-02-2011, 04:28 PM   #18
TheKid!!
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It was the computer. The cable needed to be reseated. I replaced the fuel pump and had everything checked... It came down to loose cable. I had the computer replaced as well. I took out the passenger seat and got under the DASHBOARD. Why is the computer under the DASHBOARD? I think I will ty-rap the cables to the computer box. what do you guys think?
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Old 02-02-2011, 05:15 PM   #19
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Quote:
Originally Posted by TheKid!! View Post
It was the computer. The cable needed to be reseated. I replaced the fuel pump and had everything checked... It came down to loose cable. I had the computer replaced as well. I took out the passenger seat and got under the DASHBOARD. Why is the computer under the DASHBOARD? I think I will ty-rap the cables to the computer box. what do you guys think?
Way to keep at it!
Yes stuff is hidden all over the C4......just wasn't enough room to put everything out in the open. 20lbs of crap in a 10lb box kinda thing sums it up.

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Old 02-02-2011, 05:22 PM   #20
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Good job
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Old 02-02-2011, 05:22 PM
 
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