A couple pictures from 4-25-2023
 

It was a nice day in western Oregon. So, with the troubleshooting of the stumble or misfire done and the issues resolved the car is running well. Took it for a drive in the morning to enjoy some dry roads and sunshine. Stopped and took a couple photos at Thompson's Mill near Shedd, Oregon.
Brian
https://www.zr1.net/forum/picture.ph...pictureid=5121
https://www.zr1.net/forum/picture.ph...pictureid=5120

Re: A couple pictures from 4-25-2023
 

Lookin good

Re: A couple pictures from 4-25-2023
 

Very nice.

Re: A couple pictures from 4-25-2023
 

Red with black wheels... Nice combination :thumbsup:

Re: A couple pictures from 4-25-2023
 

Awesome! It?s great to enjoy the better weather. Winter hurts


1992 Polo Green ZR-1, DRM500

Re: A couple pictures from 4-25-2023
 

Nice color

Re: A couple pictures from 4-25-2023
 

What was the cause of your stumble?

Re: A couple pictures from 4-25-2023
 

A new set of plugs solved the misfire problem, even though the old plugs looked ok. Then I had a check engine code for the knock sensor that was intermittent. Once I got rid of the misfire then the knock sensor issue would prevent the engine from pulling to the rev limiter in 4th gear. Check the knock sensor wire from the sensor to the ECU, no issue, so replaced the knock sensor and now the engine will pull to rev limiter in 1st thru 4th gears. Haven?t tried to hit the rev limiter in 5th gear, too fast for the country roads IMO.
Brian

Re: A couple pictures from 4-25-2023
 

Thanks, I have a similar issue we are tracking down. Plugs, wires and injectors were changed at Haibeck 20k miles ago. We think the problem is coils, they are aftermarket and have 65k miles on them. Will pull the plenum and hope to see the problem on a coil.