Thanks! Hope you find the issue. Damn intermittent crap is the worst...
CK5
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Broke @ Home : I believe the issue is fixed
- Thread starter Chevk587
- Start date
I know you already picked up a power probe, but you might want to grab a fuse buddy too.
Fuse Buddy
Plug it in place of the fuse that is blowing, put that fuse in the buddy and fire it up. I had a similar intermittent issue on my K5 where it would pop the ECM 1 fuse and stall the truck out. The fuse itself didn't just POP like you would expect. The fuse looked like the plastic melted slightly and then would fail. The fuse buddy allowed me to see the current while running and found it was right at the rating of the fuse if not 1 or 2 amps over. It wasn't a spike that killed the fuse, but extended time right at the rated amount for the fuse. I bumped the fuse size up by 5 amps, moving from a 15 to 20amp. The only thing on the fuse was the aftermarket ECM I was using for the 5.3 and it was just a little bit more needy for current than the old TBI computer. After changing the fuse out I never had an issue again.
Fuse Buddy
Plug it in place of the fuse that is blowing, put that fuse in the buddy and fire it up. I had a similar intermittent issue on my K5 where it would pop the ECM 1 fuse and stall the truck out. The fuse itself didn't just POP like you would expect. The fuse looked like the plastic melted slightly and then would fail. The fuse buddy allowed me to see the current while running and found it was right at the rating of the fuse if not 1 or 2 amps over. It wasn't a spike that killed the fuse, but extended time right at the rated amount for the fuse. I bumped the fuse size up by 5 amps, moving from a 15 to 20amp. The only thing on the fuse was the aftermarket ECM I was using for the 5.3 and it was just a little bit more needy for current than the old TBI computer. After changing the fuse out I never had an issue again.
Changed the fuel pump hasn’t died yet but this is an intermittent I’m not convinced yet It’s never that simple for me lol .
@ktmoutfront had trouble with his TBI dying intermittently a few years ago. Turned out to be a loose wire in a plug. Can't remember which plug it was, but he only found it by chance.
I’m leaning towards this problem just don’t know and hard to find .
CrpMag122
1/2 ton status
Just throwing this out as another possibility/long shot, buddy of mine had a 5.3 doing something similar. He was running an over oiled foam air filter that gunked up his mass air flow sensor and we suspect also gunked up the idle control valve. Cleaned the mass air flow sensor and it started to run much better. About two months later he started to experience similar symptoms as your stalling out and some error codes. Cleaned the gunked up idle control valve and it fixed his issue. Doubt it’s your problem but figured I would throw it out there.
