03 silverado running rough
I was coming home from deer hunting pulling my atv trailer. I stopped and got gas and 80 miles later it seemed like I was down on power and the truck was kind of shaking. I got into town and when I st...
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Thanks for the tip. I put 150 miles on it today and it seems to be running fine.
LIKE2BUILD wrote:Thunderbolt wrote:
Update. I am not positive it is fixed, but it may be. I am ashamed to say the spark plugs must have had more miles than I thought. They were worn bad and instead of a .060 gap they were at .090+. I changed them and it runs great and idles smooth, but I am not positive the actual problem is fixed.The reason I say that is because the truck had cooled down and if I am not mistaken the coil packs can act up when hot. Is that a correct assumption ? It is idling smoother than it has in awhile.Any guesses on whether the problem is solved ?? I got the ac/delco plugs the dealer told me to, but the new ones are only .040 instead of .060. The dealer said they changed the specifications.
Yes, electrical gremlins like to show up in hot conditions. It's also possible you might have one or more coils that are marginal and with that excessive plug gap couldn't deliver enough juice to jump the gap and properly fire the cylinder(s).
Take a look at this GM coil testing guide to see if you ignition coils are good or failing.
KJ
