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Old 01-11-2005, 04:08 PM
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84 S-15 keeps dying

I have a 1984 GMC S-15 truck 2.8 V-6. The problem is it keeps dying on me. Sometimes after a mile, sometimes after 20 miles, it will just dies out. It will turn over but will not start. Give it a few minutes and it will start back up, run for a while and die again. I have replaced the fuel pump,fuel filter, coil, ignition module, cap, rotor, plugs, wires and rebuilt the carb to no avail. I pretty sure it's ignition related, but I've replaced everything. Any help please????
Thanks.
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Old 01-11-2005, 05:36 PM
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hmm sounds to me like the alternator has a bad diode...sometimes that happens with Alternators..they work sometimes and then not others...so I'd get that tested and get your battery tested. it's probably something as simple as one of them..
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Old 01-11-2005, 06:22 PM
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Battery is new. It was replaced with the other parts. I think even if that was the case the battery would keep it alive when the alt stops putting out voltage, even intermittently. Like I said when it does die, you can try to restart it right away. It will turn over but no vroom vroom. I'll give it a look see. Thanks

THe Wolf
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Old 01-11-2005, 06:43 PM
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i also had this same problem with a 91 s-10 but it has TBI and is a 4.3 but anyway i also replaced the fuel filter,cap,rotor,plugs,plug wires,ignition module and the coil. but luckally the coil did the trick. but my naxt step was the coil pick up so you might try that. thier not to bad i think at auto zone for a 4.3 it was like 15 bucks the worst part it you have to remove the distibuter
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Old 01-12-2005, 11:13 AM
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When it dies, ground a plug wire to see if it is really firing.

This is a really long shot, but I have this happen a couple of times over the years. Check your entire PCV system, I have seen it get restricted to the point that the blow by produced can create enough pressure inside of the engine that it will stop it from running. After it sits for awhile the pressure will bleed off and it will start and run again for a while.
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