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Old 02-09-2004, 12:54 AM
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Blowing ECM Fuse When Ignition Is Turned On

Just rebuilt a motor for my 89 chev 2500. Everything is back in place, ready to run... BUT....

Tried starting it, no gas comming from the TBI. Checked the injectors, they are clean, and gas is running nicely to them. Then notticed that every time I turn the ignition on, I blow the 10a fuse for the ECM. Obviously here lies my problem... No computer, no injection. More of a problem, is WHERE THE H*LL and more importantly, HOW in the h*ll am I gunna find what's causing the fuse to blow? I disconnected everything under the hood including the harnesess into the ECM. Sill blow the fuse as soon as ignition is turned on. I'm stumped... I have a sick feeling that I pinched a wire or something when i dropped the new engine back in, but it dosn't make sense cuz what would blow that fuse if I completely disconnect the ECM and everything else completely?

Anyone ever had this problem before? Any suggestions? I think I'd rather sell the truck than try to find a tiny pinched wire some where in that mess of an electrical system! (Anyone got a nice 4 barel carb for sale? LOL)



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Old 02-09-2004, 02:13 AM
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Talking UPDATE UPDATE

IT RUNS!!! HOOOO YAAA!

Was reading other posts about similar problems, found mention of the trans. plug, and realized I had forgotten to unplug that to check it. Wouldn't you know, the only one I forgott was the one causing the fuse to blow. Not sure where the short is yet, but I at least was able to run the motor for the first time!

It popped right off with a few tweeks of the timing. :-D This being my first big engine overhaul, I'm quite enthused! (Had some help from the ol' man of course!

PS... I take it back, you can keep your stinkin carbs!
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Old 02-09-2004, 04:31 PM
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Hey aberg...if you get in a real bind try checking with some of the guys and gals on this site My Chevy Truck Some pretty sharp people on there that eats.sleeps, and drinks Bowtie trucks.

Kevin
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