LT5 Misfiring at All Speeds - ZR-1 Net Registry Forums

Big D · 06-22-2015

Ok everyone, Got the plenum off with no problem. Way easier then what I had imagined with all the good info on the Registry. Took about 40 minutes and broke nothing. However, I tried a suggested method for anti-freeze removal, just drain the plenum, and I would not advise that method. After releasing the plenum, antifreeze began bubbling up from the two holes in the injector housing. Plugged the holes quickly and then drained the radiator. Saving ten minutes at first cost me hours in cleanup. Dang, I hate antifreeze. The valley was extremely clean, prior to the antifreeze dump and all connectors and hoses are in very good shape. Well, at least I know the valley drain works just fine.Tested the wires and they come in at 7.5-9 K ohms for all, well within spec. Also checked the coils, all 4 coil resistance within spec. Also did a visual of the coils and they all look good, no signs of heat deterioration or cracking so I am going to let them go and just change out the injectors. I may end up regretting this decision but I was going to go with stock coils anyway so I don't see the advantage at this point. This is a very low mileage car. Looking forward to installing the new FIC injectors and getting her back on the road.

Big D
69 L46, M21
90 ZR1
95 Suzuki 1200 Bandit
2014 Triumph Thruxton

06-22-2015	#11
Big D Join Date: Jun 2014 Location: Washington State Posts: 17	Re: LT5 miss at all speeds Ok everyone, Got the plenum off with no problem. Way easier then what I had imagined with all the good info on the Registry. Took about 40 minutes and broke nothing. However, I tried a suggested method for anti-freeze removal, just drain the plenum, and I would not advise that method. After releasing the plenum, antifreeze began bubbling up from the two holes in the injector housing. Plugged the holes quickly and then drained the radiator. Saving ten minutes at first cost me hours in cleanup. Dang, I hate antifreeze. The valley was extremely clean, prior to the antifreeze dump and all connectors and hoses are in very good shape. Well, at least I know the valley drain works just fine.Tested the wires and they come in at 7.5-9 K ohms for all, well within spec. Also checked the coils, all 4 coil resistance within spec. Also did a visual of the coils and they all look good, no signs of heat deterioration or cracking so I am going to let them go and just change out the injectors. I may end up regretting this decision but I was going to go with stock coils anyway so I don't see the advantage at this point. This is a very low mileage car. Looking forward to installing the new FIC injectors and getting her back on the road. Big D 69 L46, M21 90 ZR1 95 Suzuki 1200 Bandit 2014 Triumph Thruxton