New ZR1 owner-timing & sparkplug question

[90_ZR1]

I just got my first ZR-1 (1990) last week and drove it for the first time this evening.
It doesn't idle too badly, but misfires badly when driving. My first question is what sparkplugs are recommended. I pulled one plug and it's an AC Delco 41-800. I saw another post where someone had 41-620's.
I would also like to know if the timing is adjustable, and what it should be if so.
Any advice appreciated.

[XfireZ51]

Originally Posted by 90_ZR1

I just got my first ZR-1 (1990) last week and drove it for the first time this evening.
It doesn't idle too badly, but misfires badly when driving. My first question is what sparkplugs are recommended. I pulled one plug and it's an AC Delco 41-800. I saw another post where someone had 41-620's.
I would also like to know if the timing is adjustable, and what it should be if so.
Any advice appreciated.

Timing change needs to be done by modifying the calibration.

[90_ZR1]

Ok. Is that something which you can explain?

[PhillipsLT5]

Probably injectors problem


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[zrfast1]

Originally Posted by 90_ZR1

Ok. Is that something which you can explain?

You need special tooling and expertise to interface your computer chip (prom) which is your ECM brain. Hope that helps

[We Gone]

Welcome, most all your questions can be answered here.

http://www.zr1.net/forum/showthread.php?t=16778

look at post 3, coils and plugs

[90_ZR1]

Thanks for the input guys!

[XfireZ51]

Originally Posted by 90_ZR1

Ok. Is that something which you can explain?

Timing is likely not ur issue.

[henryr]

mine has a slight and / or occasional miss 2-3k....

not sure if the car has the stock injectors or not at 26k miles

going to order a set of new injectors as the plugs look okay

[PhillipsLT5]

http://www.zr1specialist.com/HAT%20W...in%20Place.pdf