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Discussion Starter #1
helping a friend,
he replaced his 350 with an older 305 out of a camaro, (type with dipstick on drivers side). he has had multiple electrical probs since. [truck was factory 305 and replaced it with 350]. (350 broke, another story) now has an older model 305. has same factory distributer from truck, he has replaced almost all items(coil, pickup coil, ecm, rotary button, cap. He gets it cranked up, runs for 5 mins shuts off, now no spark again.
first time it did it he replaced pickup coil, ran and shut off, no spark, next he replaced coil, ran a few min and shut off, no spark, replaced ECM, ran a few mins, shut off, now no spark again....
 

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Cars, Trucks, Boats, Motorcycl
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. Need to have complete computer controlled system including CCC distributor, CCC carb., ECM, and all sensors hooked up... or ... NO CCC stuff for it to run right...
 

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Discussion Starter #3
All electronic from distributor to dash is original, only change was mechanical engine, is he missing another connection to block?
 

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You didnt mention the module which is the most common failure item.
 

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Discussion Starter #5
ECM...under dash behind glove box, last thing he replaced. Started up, ran for 5 mins, shut down..no spark again.,.
 

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Discussion Starter #7
He replaced another part, second time, flat piece inside distributor with condenser on it, cranked up ran great for 5 mins shut off and again no spark...lol
 

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Discussion Starter #9
It's a normal key, 84 gmc Sierra 1500. My thoughts are that he has some wires crossed somewhere. Seems to run long enough to burn out something then die...
 

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The issue, as I see it, the ECM sees a fault somewhere ie..... cam position sensor, crank sensor etc..... and shuts down the coil firing circuit. Without a diagnostic scan it's hard to tell what it is
 

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The module in the distributor is the most common failure. Small white block with 4 to 6 wires. Did he change it and if so did he put the grease on the back
 
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