Inj 1 fues keeps blowing - ZR-1 Net Registry Forums

LGAFF · 01-24-2016

A month or so ago I had the plenum off my 1991 368. I noticed an electrical smell coming from the valley. One of the coils was very hot...so I pulled the coils off the coil housing and swapped them.
I also had the Inj 1 fuse blow. It now blows any time the ignition switch is turned on, except when I disconnect the two wire plug that goes onto the coil housing.(pnk/blck)

So is the coil housing possible the culprit? It all encased wiring

Thoughts?

Its CKT 639

LGAFF · 01-25-2016

I did not see any pinched wires on the injectors

-=Jeff=- · 01-25-2016

Bent pin in a connector?

otherwise without me having a ckt diagram it is hard to troubleshoot

LGAFF · 01-25-2016

I checked all of the pins, no issues.....the coils, DIS, and the primary injectors are on this circuit. As the initial issue with the coil was with them plenum off I wonder if its the Coil housing.

XfireZ51 · 01-25-2016

Quote:

Originally Posted by LGAFF

I checked all of the pins, no issues.....the coils, DIS, and the primary injectors are on this circuit. As the initial issue with the coil was with them plenum off I wonder if its the Coil housing.

Lee,

You should be able to check the housing for short as improbable as that may be.

-=Jeff=- · 01-25-2016

what changed on the car from when it was not popping the fuse to when it started popping the fuse

LGAFF · 01-25-2016

Pulled Plenum to address a coolant leak...when the plenum was off I noticed the electrical smell from the coil

A26B · 01-25-2016

I would suspect the bad coil that overheated rather than the base. If the base were to short, then there wouldn't be any voltage to the coil to cause the overheat.

LGAFF · 01-25-2016

Coils changed, problem continues

secondchance · 01-25-2016

Bad injector? Wouldn't coils be on separate ignition circuit and injectors on injector circuit?

01-24-2016	#1
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,188	Inj 1 fues keeps blowing A month or so ago I had the plenum off my 1991 368. I noticed an electrical smell coming from the valley. One of the coils was very hot...so I pulled the coils off the coil housing and swapped them. I also had the Inj 1 fuse blow. It now blows any time the ignition switch is turned on, except when I disconnect the two wire plug that goes onto the coil housing.(pnk/blck) So is the coil housing possible the culprit? It all encased wiring Thoughts? Its CKT 639 __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

01-25-2016	#2
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,188	Re: Inj 1 fues keeps blowing I did not see any pinched wires on the injectors __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

01-25-2016	#3
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,181	Re: Inj 1 fues keeps blowing Bent pin in a connector? otherwise without me having a ckt diagram it is hard to troubleshoot __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978

01-25-2016	#4
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,188	Re: Inj 1 fues keeps blowing I checked all of the pins, no issues.....the coils, DIS, and the primary injectors are on this circuit. As the initial issue with the coil was with them plenum off I wonder if its the Coil housing. __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

01-25-2016	#6
-=Jeff=- Join Date: Jul 2007 Location: Bartlett, IL Posts: 7,181	Re: Inj 1 fues keeps blowing what changed on the car from when it was not popping the fuse to when it started popping the fuse __________________ 1990 Corvette ZR-1 #1051 Watson Headers (2" Primary) - Flowmaster Cats - Borla Catback Late Model IH - Plenum Coilovers - 4.10s Shelby Series 1 - Wilwood Brakes Custom Interior NCM Lifetime Member #978

01-25-2016	#7
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,188	Re: Inj 1 fues keeps blowing Pulled Plenum to address a coolant leak...when the plenum was off I noticed the electrical smell from the coil __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

01-25-2016	#8
A26B Join Date: Dec 2003 Location: Arcadia,OK Posts: 3,396	Re: Inj 1 fues keeps blowing I would suspect the bad coil that overheated rather than the base. If the base were to short, then there wouldn't be any voltage to the coil to cause the overheat. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed. Last edited by A26B; 01-25-2016 at 01:21 PM.*

01-25-2016	#9
LGAFF Join Date: Mar 2007 Location: Crystal Lake, IL Posts: 7,188	Re: Inj 1 fues keeps blowing Coils changed, problem continues __________________ LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359

01-25-2016	#10
secondchance Join Date: Aug 2006 Location: McLean, VA Posts: 3,726	Re: Inj 1 fues keeps blowing Bad injector? Wouldn't coils be on separate ignition circuit and injectors on injector circuit?

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