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Username Post: Electrical short
Member #271 Senior Chevytalk Moderator
Posts: 25367
Loc: Austin, TX 78748
Reg: 05-09-00
01-23-20 05:00 AM - Post#2784950    
    In response to hinges56

You have a dead short somewhere. I had a similar problem tracing a blowing fuse as soon the key was inserted. It was a '13 F150 3.5 twin turbo. I traced back what the owner did to fix two codes. He replaced two parts, coil on plug and cam sensor, from a 3.5 Mazda!! The sensor was easy to find from a receipt and box part number. The coil pack was harder. I unplugged all the coil packs. After inserting they key, the fuse didn't blow. I knew I was close. So plugging one at a time with the replaced coil last. On that last one, the fuse popped. I pull it to check resistance and compare it to an original. Well, the new coil pack had a two prong connection. The original a three prong connection. The original coil pack was installed. The problem causing a misfire was a bad plug.
Follow the same steps. Unplug all the non working items. Using a new fuse, plug in one item at a time. Eventually, you'll find the short. Either a wire, connection, or item are bad. Check all your grounds. Add more too. Check the ECM ground. Engine to frame. Engine to body. Battery to frame. Battery to engine.
Sign up at You'll find factory wiring diagrams. The '91 is fairly simple wiring. It is TBI? If so, email me. I'll send you a TBI troubleshooting guide.
'83 Silverardo XST - ZZ4 powered
'95 Jimmy SLT (Bought @131,814)
'96 GMC Jimmy LS Ret. @236651 miles
'08 GMC Acadia 3.6L SLE

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