LT5 Misfiring at All Speeds

[tccrab]

Originally Posted by Paul Workman

IIRC, there was a post (by Marc Haibeck??) a year or so back warning about that very thing: be very careful NOT to shove a pin (such as on a VOM probe) into those connectors as over expanding the cylinder (female side) of the connector is a common problem.

Ayup.
I remember reading it and saying to myself, "BOY, I sure wish I had read this FIRST!!!"

'Crabs

[Big D]

I did read it and I thought I had picked the correct size pin to insert into the socket but obviously I must not have. Hopefully this will fix this problem and I can move on. Thanks to all for all the help, previous postings and information.

Big D
69 L46/M21
90 ZR1

[RussMcB]

Good job, you guys. I'm impressed you were able to track it down methodically.

And I guess the lesson here is, whenever you have a problem read the entire contents of ZR1.net and you'll find the answer. :-)

[Paul Workman]

Originally Posted by Big D

I did read it and I thought I had picked the correct size pin to insert into the socket but obviously I must not have. Hopefully this will fix this problem and I can move on. Thanks to all for all the help, previous postings and information.

Big D
69 L46/M21
90 ZR1

I give you "cudoes" for breaking this down in logical steps. I think you'll get along with this car just fine!

[Johnny5]

i have the same hesitation/miss at low acceleration, idle is fine and WOT is great. I changed coils, FIC injectors and 6 spark plugs. LMK what you find. I still need to change the back 2 plugs so I'm hoping that's it.

[IMZZ]

Johnny5 you can try to isolate if it is one of the back cylinders by pulling a plug wire like BigD did in post #20.

[Big D]

IMZZ, have you done the injectors yet? I got my de-pin tool and the sockets from 'Crabs today so hopefully i can get to it this weekend and get her fixed. Thanks 'Crabs for the sockets and info, should be able to handle it, very similar to aircraft connector repair.

Big D
69 L48/M21
90 ZR1

[Johnny5]

Originally Posted by IMZZ

Johnny5 you can try to isolate if it is one of the back cylinders by pulling a plug wire like BigD did in post #20.

Thanks IMZZ I have to get around to it. She runs great at WOT so thats 98% of what I drive it at

[Paul Workman]

Food for thought...

After I first got my Z, it had a slight "miss" on one cylinder that wasn't so apparent under heavier throttle - if much at all. Turned out to be a burnt valve, stemming from a weak primary injector!

Just sayin.....

[Johnny5]

I replaces my injectors when i first bought it, all coil packs, wires, and 6 spark plugs. The bog is iccasionally only under slight throttle. Hopefully its a plug i havent changed.