After [re]installing a new DC short shifter for the 3rd time (never buy one they break), somehow I started blowing the PGM-FI fuse. This exact same thing happened to my old Blazer and I never could figure it out so I just sold the thing off.

The car wouldn't *fire* after the install so I checked the fuses, found the bad one on my first guess. On the fusebox it's labeled ACC IGN. 15A. Replaced it and pulled out of the garage then it blew. Fiddled around with the harnesses on the fuse and the PGM-FI relay, ecu, etc. Drove the car for a few minutes around the lot and all was well. Pulled out onto the street and punched it, and on the 1-2 shift there she blew. Whatever it was stayed shorted and I had to get a pull back to the garage (that Carbing strut bar is really giving me my money's worth, hooked the tow strap to it). Okay enough boring details.

Busted out the multimeter when I got the car back and of course the problem is gone. I absolutely HATE these intermittent electrical problems this is my 3rd car that's been plagued with them.

What's the deal, anyone had this experience, etc.?
Where does this circuit run? I think it goes to the PGM-FI main relay, and thru that the fuel pump, ecu, VSS circuit???? What the hell could be shorting out?
Is it coincidence that it started happening after I moved some wires behind the radio when I pulled it out?

Would someone do me a favor and measure the resistance from ground to the fuse?

Hope someone can help as I want to be able to attend a track event Monday.

 

Look at that.