snub disphenoid

I have searched, and it doesn't seem like people have a problem like mine with chronic EGI fuse-blowing. The fuse first blew last night after the car had been sitting for about an hour. I didn't get a fuse until 2 hours later, at which point I popped it in and the car drove fine. About 15 minutes of driving later, the fuse blew again while the car was cruising along. So we pushed the car a 1/4 mile into a parking lot and let it sit for the rest of the night. Right after blowing the fuse blew for the second time I tried putting a new fuse in right after the fuse blew, and it blew as soon as I put it in (the fuse was hot after it blew)

The car sat for 8 hours as I slept at a friend's house, and the next morning I put in a fuse, expecting it to blow. It did not, and the car drove about 60 miles to a meet. After the meet, I was on the highway and the fuse blew AGAIN while driving. Again I try to put in a new fuse right after it blows one and it pops immediately.

We've tried a few things:

Disconnected all solenoids. Still popped with all 5 disconnected.

We tried disconnecting the MSD ignition box, assuming that the wiring job on it was faulty, I guess it wasn't that.


Now, I'm inclined to believe that it's a temperature-dependent issue, but that doesn't completely check out with me because the car reached full operating temperature a few times and the fuse didn't blow, but ever since the EGI fuse first blew, it only blew while cruising after the engine was cruising at full operating temp.

EGI fuses blowing chronically are usually wires shorting out somewhere, but a quick pass through the engine didn't really turn up anything. Anyone have an idea? Too many accessories loaded onto the ignition switch?

Car is an S5 NA, has an FD alt. Thanks for any input, we'll be going through the car's wiring next weekend, any idea where else to look?

snub disphenoid

zomgwtf is going on. I'll be checking over the wiring harness as much as I can tomorrow, but I'm no guru and I won't have the FSM at hand when I do.

Aaron Cake

iTrader: (1)

The EGI fuse runs the fuel injection and coils. If you are blowing the fuse you have a direct short somewhere. Did you check the black/yellow wires around the ignition coils? Pinched solenoid wires around the upper intake?

gxlspeeder

Mine kept blowing after I removed the ACV, two of the wires were touching each other. Might check there.

snub disphenoid

The solenoid wires checked out fine, the solenoids themselves have not failed because the car blew a fuse even after I disconnected all of the solenoids. I did check the wires around the coil packs and they seem fine. I also checked the ACV and aside from one part of the wiring that is covered by a metal clip, the wires looked fine.

Does this fuse control anything temperature-related? It seems like it only blows the fuse when the engine is at full operating temperature.

HAILERS

EGI COMP fuse? Or EGI INJ fuse? Matters.

snub disphenoid

I only have one EGI on the cover of my engine bay fuse block, but it's the topmost fuse, so going off the fuse block diagram in the FAQ it's the EGI COMP fuse.

HAILERS

Oh, S5 is different. Only one EGI evidently.

The online FSM wiring shows it does a lot of what was said above. It feeds all the solenoids. It will be the BLACK/WHITE wire at each of those solenoid plugs.

It does other things too. It feeds the W/L wire on the alternator. The white/blue wire. PUll that plug off and see if the fuse still blows.

It also feeds the Air Bag Control Unit at pin 1L, where ever that unit is I know not.

It also feeds pin 1B on the ECU plus the Check Connector for the tps test connector.

Actually it feeds the MAIN RELAY first before going on to feed the solenoid and ECU. It comes to the MAIN RELAY on a white/blue wire and leave on a Black/White wire.

The solenoids are, AWS, Split Air, BAC, FPR, 6pi, two wires on the OMP stepping motor, Port Air, VDI, Switching, Relief. All those solenoids.

There is another three wire check connector with a black/white wire, a yellow wire and a yellow/black wire. I'm not familiar with or where that one is. Those wires are in a six socket connector so I think it must be that green check connetor for ????

Try taking the Alt small plug off first.

That's about all I know about that subject.

mr0pistons

Check any emissions related plugs/wires. I removed my ACV and didn't tie down the wire that was plugged to it, the SOB melted to the downpipe and was shorting out.

snub disphenoid

Thanks for the input guys, but unfortunately I'm out of time for this weekend and have to return to school. I'll take my car to my mechanic's shop next weekend and we'll check over all the things mentioned here, thanks for digging up what's on the circuit HAILERS, that will save us some time.

Sucks that I have to take my TII back to school, instead of getting 25mpg with a radio and a fantastic suspension, now I have to get 19mpg with no radio and a disconnected front swaybar