INJ1 Fuse Blowing

[XfireZ51]

Cliff,

I've had the MSDs in my motor for 8 years. Never skipped a beat.

[Dynomite]

I have MSDs in my 91' and besides I like RED

MSD Ignition Coil 8224




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[GOLDCYLON]

Originally Posted by Dynomite

I have MSDs in my 91' and besides I like RED


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And tan interiors

My money is on the injector wires

[Dynomite]

Originally Posted by GOLDCYLON

And tan interiors

My money is on the injector wires

I am thinking that also as I really gave each Injector Connecter the "once over" as did Lee. Both of us installed new Coils as I recall. Lee removed the Injector Wire Loom and installed a New Loom (the corrugated black plastic with longitudinal opening). I did considerable manipulation of that Injector Wire Harness also. I will be doing some more testing tomorrow.

It was interesting that I blew the 5 amp fuse which I installed just for testing purposes as I wanted to get an indication at what amperage the fuses were operating if in fact I solved the issue. The 5 amp fuse did last for about 10 minutes which indicates that the INJ1 circuit is operating right around 5 amps.

Tan Interiors are very nice and I really like the 95' seats as they are considerably different than the earlier 90'-91' seats (A bit more flimsy looking but more comfortable). And the 95' seats do not have that arm on door Side of the seat that I keep sitting on getting into and out of the Z

[Racinfan83]

^^^^ Exactly why I put '95 seats in my '90..

[Dynomite]

Originally Posted by Racinfan83

^^^^ Exactly why I put '95 seats in my '90..

Yes...... Differences between 90', 91' and 95' ZR-1s and Engines

One thing I did was install a Black Label Trans rebuilt by ZFdoc into my 95'
Rebuilt Black Label Transmission Installed

I really like the Reverse lock out feature in the Black Label and of course have ZFdoc Short Shifter in the Rebuilt ZF S6-40 Transmission

The 95' is my favorite if you can find one at a reasonable price

[GOLDCYLON]

Originally Posted by Racinfan83

^^^^ Exactly why I put '95 seats in my '90..

X2 but I'm running 96 sports in mine. My wide rear does not like bolster button butt

[Dynomite]

Ok boys and girls. I did some more testing on the INJ1 issue. Took a 15 mile drive and INJ1 blew again.......so......not fixed.

Resistance after fuse blew downside fuse was .5 Ohms.

Took top end apart watching dowside resistance. I disconnected three front plugs from DIS and no change in resistance. Disconnected large rear plug and resistance jumped much higher. Connected everything back and INJ1 downside resistance settled at 1200 Ohms. Put back Everything with three Plenum bolts each side and runs perfectly

I think I am zeroing on something. Will run till INJ1 blows again and repeat diagnosis. First thing when fuse blows again or if does not blow is to check all pins in large rear DIS connector.


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[LGAFF]

could an injector be shorted?

[LGAFF]

bad ecm?