I am getting a misfire code on 1 and 2 cyl.

10

Asked by Oct 22, 2012 at 10:22 AM about the 2003 Chevrolet Silverado 1500 LS Short Bed 2WD

Question type: Maintenance & Repair

I have replaced the cap,button, wires, plugs, injectors (the whole spider), both top O2 censors and a couple other items I can't remember what they are called one on the side of the dist, the other was vac related. 4.3 V6

9 Answers

2,855

do u actually feel the misfire?

10

barley at idle. it smooths out over 3-4k rpm.

31,895

Compression test?

2,855

id check compression on these cylinders and at least one good cylinder and compare the two

31,895

My cousins neon has a dead cylinder #1 it only has 30-35 psi wet or dry doesn't matter. It smooths out around 2500.

1 out of 1 people think this is helpful.
16,915

yes, a dead cylinder or multiple will smooth out with more rpms. The more cylinders the less you notice a miss and easier it will be covered up by reving. Buddy of mine has a honda with 2 and 4 missing, cant feel much at 4000. Idle is horrible tho... Have a compression test done dry then wet and post results. Have a feeling this will tell you your problem.

10

Cyl 1 & 2 have plenty of compression, 160 psi with very little differance between the two. I reset the spark plug gap, .040, I saw on another sight some one with the same problem found the gear on his distributor was worn and it cleared up after replacing it.

1 out of 1 people think this is helpful.
31,895

The gear is usually just pot metal so that is understandable. Make sure you have a timing light and unplug the electronic adjustment to set the new one correctly.

10

Will do thanks for the info.

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