LT5 miss at all speeds

[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.

[IMZZ]

Originally Posted by Big D

IMZZ, have you done the injectors yet?

I got my injectors on Saturday. I'm trying to clean and restore everything before I put it back together. There is sure a lot of things to remember to do when putting these back together. I am trying to source a weatherpack seal that I believe was missing from previous work. I'm hoping to get it running by the weekend.

[Johnny5]

Originally Posted by 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.....

Thats scaring me. I have to get some universals together to changevthe back 2 plugs and pray that it was an old plug causing it

[XfireZ51]

Watch this video. Some things sound familiar, maybe?

Also very interesting comments in this vid regarding effect of oil in throttle body


http://youtu.be/Mk4e5XFe47A Go to 5:06

[Big D]

I got the swivel socket from NAPA and it works great getting the back two plugs out. It is easy with a swivel. Hope the plug is the problem.
I'm still chasing gremlins in mine. When I shoot back into the ECM, #6 injector pin is showing 86 k-ohms while the others are showing .97 - 1.0 m-ohms. Not sure if that makes a difference since I wasn't able to check to see if the injector is working; two person job and my assistant was working last weekend, one to turn over the car while I look down the injector housing to check for fuel spray. Hopefully I will be able to check it this weekend.
By the way, anybody out there have a good schematic/diagram for the ECM, or know where I can get one? Would sure help in troubleshooting.

Big D
69 L46/M21
90 ZR1

[XfireZ51]

Originally Posted by Big D

I got the swivel socket from NAPA and it works great getting the back two plugs out. It is easy with a swivel. Hope the plug is the problem.
I'm still chasing gremlins in mine. When I shoot back into the ECM, #6 injector pin is showing 86 k-ohms while the others are showing .97 - 1.0 m-ohms. Not sure if that makes a difference since I wasn't able to check to see if the injector is working; two person job and my assistant was working last weekend, one to turn over the car while I look down the injector housing to check for fuel spray. Hopefully I will be able to check it this weekend.
By the way, anybody out there have a good schematic/diagram for the ECM, or know where I can get one? Would sure help in troubleshooting.

Big D
69 L46/M21
90 ZR1

Not sure why you'd want a schematic. The pinouts are available in the FSM which I assume is what you really need.