random missfire codes
#1
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random missfire codes
hey guys I am getting misfires in cylinders 7 and 2 and I have changed about everthing i can think of but they aren't going away. I checked the plugs, wires and even the coils and i am still getting a lot of misfires. The truck runs great is the wierd thing. It feels like it may being missing a little when it first starts but after it warms up it idles fine. I don't understand it. Anybody have any ideas?
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Originally Posted by seadog
hey guys I am getting misfires in cylinders 7 and 2 and I have changed about everthing i can think of but they aren't going away. I checked the plugs, wires and even the coils and i am still getting a lot of misfires. The truck runs great is the wierd thing. It feels like it may being missing a little when it first starts but after it warms up it idles fine. I don't understand it. Anybody have any ideas?
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I had the same problem, and changed everything just as you have. I found out that my gasket between the intake manifold and heads was torn. I replaced it and the problem was gone. Try that or GM top engine cleaner. Any GM dealership can do it for about $75.00. Ensure that they do the GM top engine clean and nothing else.
#4
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alright i will have to try that. Which of your cylinders were missing when you had to change your gaseket. That sounds logical to me because sometimes i get codes in other cylinders too but just minor ones.
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My missfire was on 1 & 8. There were little ones on other cylinders as well. After doing GM top cleaner and changing intake gasket all was good. Except my idle...... but when you fix something on a LS1, something else seems to go wrong..... Good luck.