Ok, under the hood there is that block of fuses with the EGI fuse and main fuse and all those other ones. The first 30amp fuse is labeled EGI Comp. and when I turn the key to the on position, that fuse will get really hot and then glow red and eventually blow up.

My question is why? What does that fuse protect? The ECU?

Also, there is no ignition and when the key is turned on the electric fan will run constantly.

Can anyone help me out? Anone ever deal with something like this before?

Thanks

 

It feeds all those solenoids on the engine, yellow, blue, grey, orange etc plus the two solenoids on the acv. Disconnect all the solenoid plugs and see if you still have the problem. If it does not exibit the same problem, then put one solenoid wire back on one at at time til the problem returns. You can figure the rest out by yourself.

If the problem does not go away......then it;s another thing. Possibly the reverse/fifth gear switch shorted internally.

 

your awsome thanks

 

Hailers might win the kewpie doll back from me...I guess port or split air solenoids on the ACV. Direct shorts to ground will usually blow the fuse pretty quickly, you won't be able to stand there and watch it glow pretty colors, for instance. Bad solenoid coil might take her a little longer, because it's acting as something like a toaster heating element now, lol...Look at the wiring near the solenoids for any overheating signs, that'll be your bad guy.

 

fuse does take a long time to blow it is like a toaster hetating up! we disconnected all the emmision solinoids on the top of the motor and the rev/neutral switchs and it still blows ??

where would the air by pass relay be located??

would this fuse be linked to the ignition problem??

 

In reverse order:

No, ignition is powered by the 40A EGI INJ fuse...

Air bypass relay is located forward of the stock airbox, bolted to the "bulkhead" behind the right headlight assy. Might be another relay in that area too on your '86, being the retractor relay. '88's don't have that relay, much to Hailer's dismay

The air bypass relay will have red/yellow, black/white, black, and brown/yellow wiring going into the plug, for identification purposes...

Here's a list of powered components from that fuse:

1) main relay (just the contacts, so doubt that's it)
2) black/white wire of check connector for ECU codes (green plug near leading coil pack, make sure nothing's in that terminal that might be shorting to ground)
3) split air solenoid valve (ACV)
4) pressure regulator control solenoid valve (orange one on the vac rack)
5) port air solenoid valve (ACV)
6) EGR solenoid valve (yellow one on vac rack)
7) BAC valve (side of throttle body)
8) switching solenoid valve (gray on vac rack)
9) relief solenoid valve (blue)
10) black/white wire of TPS check connector (same scenario as the other connector mentioned above)
11) ECU (pin 3I)
12) air bypass relay
13) air bypass solenoid valve (if ABP relay is energized)

There ya go- if it's not one of those components, it's wiring...

 

the only thing thatwe havent checked is the air by pass relay and i didnt know wheer it was ok thanks alot man and if its not that then ill see about the wiring but it looks like that is the only spot where it heats up just that fuse

 

if i had the emmisions off for doing a silicon kit what could i of grounded that shouldnt be grounded and making that fuse blow and not have any more spark

thanks

 

That's the only spot that should be heating up with a defect in the circuit, that's what fuses are for. The weak link in the chain, so to speak.

Have you pulled the plug off of the ECU? The small one, on the left side of the ECU. If everything else is unplugged, try that...

I have no idea what you may have done while doing your "silicone kit". That's for you to figure out. Retrace your steps....

 

Air Bypass relay on a turboii. I don't think so......as in ......it don't hardly exist. Air bypass solenoid...yeah. ON top of the intake manifold near the bac.

Kewpie dolls are a dime a dozen. It's the much coveted Bobble Head, presently owned by NZCONVERTIBLE that is the prize.

Don't forget the air supply valve on the back of the throttle body or the turbos TCV , solenoid on the emissions rack, the ATP sensor. The PPCV valve, power steering relay

 

Man, I worked hard for that Kewpie doll, now you're telling me it's not worth anything??? The Bobble head should not have been sent south of the equator, in the lands where water spins the other way down the drain. For shame...

Actually, I thought the profile said "86" instead of "89". Would that be a form of dyslexia? Or old age/ poor eyesight...

Oh, now I realize he said '87 T2. Damn, I give up, lol...

 

Bobble Head. As on Dave Despains *WindTunnel* program on The Speed Channel. I really, really, really, wish you hadn't caught yourself with that 86....89 remark. What fun it would have been if you hadn't! (smiley, here, please)