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Really need some ideas on this ! Random dying issue

Wish I was closer for a second set of eyes. I still think you have a wiring and or some sort of ground issue. I always start my investigation with whatever I’ve touched or modified in the past first. I speak from experience in this department :doah:
 
skunked said:
Wish I was closer for a second set of eyes. I still think you have a wiring and or some sort of ground issue. I always start my investigation with whatever I’ve touched or modified in the past first. I speak from experience in this department :doah:
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So pretty much everything lol
 
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Chevk587 said:
Ok so after talking to @skunked for awhile . And going over ideas of what could be causing the issue grounds were next . Well he sent me this link https://ck5.com/forums/threads/continuation-of-the-injector-pulse-signal-issue-question.313845/
To an old post with some great info and similar issues. Decided to test the coil it failed step 2 and 3 will change tomorrow hope this is the issue !
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Switched the coil today and re checked the old one seems I didn’t get my test probe down far enough . So back to the drawing board .
 
Pickup coil in distributor. My burb had the same issue.
 
ktmoutfront said:
New distributor with new internals did not solve it.
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Have you checked what the injectors read for resistance? May need to be checked both on a cold engine (when you are certain it will start) then immediately after it dies.

Had a problem with mine where the truck would start once a day, but after that, would need to sit hours to start again. Had spark, but no injector pulse. TPI setup, a couple of injectors were out of spec, and somehow that didnt allow the ECM to fire the injectors. Both TBI and TPI use two injector circuits (TPI is just ganged up four per circuit on an 8 cylinder) so I can imagine an out of spec TBI injector could do the same thing, being 100% of the load on its injector circuit.

I thought you had no spark as well as no injecote pulse, but going back and re-reading, it appears you do have spark, but no pulse. Just like mine...

Thought about this more. Easier with TBI than my setup... If it's an injector issue, I would assume that by disconnecting both injector connectors, if you then got an injector pulse, you'd know the problem was injector(s), without needing to test resistance on either one. Could test resistance too, but disconnecting both injectors seems easier and more likely to show if the injector(s) are an issue.
 
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Ok so I’ve tracked it down to something is definitely telling the pump to not run it’ll lose power and die could not not get it to die with a power wire straight to the pump completely passing up the relay . When it does die and does not want to start the injectors start making a popping noise ? I’ll post as I find more .
 
nvrenuf said:
Could the injector noise just be them functioning dry?
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Yes I think so . So there’s a connector in the engine area driver side close to the fire wall I’ve been chasing the wire From the pump led me to that point I confirmed while cranking I had voltage on one side of the connector and not the other down by the pump when engine would not start . So I must have either a bad connection or broken wire somewhere?
 
Chevk587 said:
Yes I think so . So there’s a connector in the engine area driver side close to the fire wall I’ve been chasing the wire From the pump led me to that point I confirmed while cranking I had voltage on one side of the connector and not the other down by the pump when engine would not start . So I must have either a bad connection or broken wire somewhere?
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Still trying to confirm this though
 
I unplugged the connector everything looked good plugged it back in it didn’t seem loose but plugged it back in and it doesn’t seem to want to die .
 
Also simulated unplugging the connector and trying to start the motor unplugged and had the same result in popping noise from the injectors as when it died . Iono
 
I've seen a shorted fuel injector on a Buick Skyhawk shut the engine down randomly before..car had a 4 cylinder engine with an injector for each cylinder and the owner went nuts replacing things and it still would die whenever it felt like it,sometimes it ran fine for days till it acted up--car was his grandmothers,had real low miles and was in nice shape,but it had sat about a year..

One day he brought it to my friends shop,left it running,and it died,first time it did,every other time it ran perfect!...

My friend decided to start unplugging injectors one at a time,and had him crank it over--when he unplugged one of them,it fired up and ran on 3 cylinders...he bought 4 new injectors and the car has run OK ever since..after spending much $$$ on un-needed parts and tearing apart wiring harnesses looking for a bad or chewed wire or one chafing against something..

I guess if an injector shorts to ground it kills the fuel pulse signal from the ignition module or ECM?..
 
Chevk587 said:
Ok so I’ve tracked it down to something is definitely telling the pump to not run it’ll lose power and die could not not get it to die with a power wire straight to the pump completely passing up the relay . When it does die and does not want to start.
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There should be a single red wire dangling from the fuel pump relay connector. If you put 12v to that, it sends 12v to the pump. If it does it again, and the pump wont run, put 12v to that wire...that will tell you if the problem is the relay or the wiring "downstream" to the pump.

Also, either your oil pressure switch isnt working properly either, it shouldnt die with a running engine regardless of the relay, or you have a wiring issue "after" both the relay and switch.
 
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