Cylinder one misfire

1998 GMC SONOMA

164,000 MILES • 4.3L • 6 CYL • 2WD • AUTOMATIC

MR.JOSHUA79

MEMBER
1 POST

Hello, I have the truck listed above with a 4.3 liter Vortec. I've just finished changing the cylinder heads and now I have a misfire in cylinder 1. checked plug and wire, I'm getting plenty of spark. Can't find any value leaks. I'm told that it may be one of the spider injectors but not sure. Any help would be greatly appreciated !
Thanks

May 7, 2021 at 6:53 AM

ASEMASTER6371

✓Experienced Mechanic
52,796 POSTS

Good afternoon,

I would start by checking the compression. You need 140-160 on that cylinder.

https://www.2carpros.com/articles/how-to-test-engine-compression

Yes, it could be the spider. It is a common issue. Are there any codes set?

https://www.2carpros.com/articles/how-to-test-a-fuel-injector

https://www.2carpros.com/articles/how-to-replace-a-fuel-injector

I attached the procedure for you for replacing the spider assembly.

Roy

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