random misfire code wtf? P0300
random misfire code wtf? P0300 I had my car to the dealer today because of I've been setting random misfire codes. 150 misfires in #5 cyl. and 147 misfires in #8 cyl. They told me that my plugs and wires are fine and they don't have a clue how to fix it until someone from GM discusses it with them. Do you think that there is a problem with the coil packs. Any suggestions please.
Originally Posted by 2002SilverWS-6
no cam. stock internals.
I don't want to remove the random misfires from my tuning because my car is running like **** right now. You can definately hear when it is misfiring and also feel it. It is breaking up at 4700-5800 at wot in 3rd and 4th gear.
Well I went and changed my plugs to NGK tr55's and put on Taylor Thundervolt 10.4 wires and got rid of my random misfire code P0300 but now I am setting P0308 so does this mean that I only have a problem with #8 cylinder. My car is still breaking up at wot above 4700rpm in 3rd and 4th gear. I am going to swap the coil packs around to see if anything changes. Is there anything else I should do or look for. I don't think that I have a bent pushrod because the motor sounds quiet to me.
Had the same problems exactly the same problems. Found out it was bent PR and weak VS. A set of LS6 VS cured all my issues
http://www.ls1.com/forums/showthread...ighlight=valve
http://www.ls1.com/forums/showthread...ighlight=valve
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i overreved my engine one time went from a 3rd to 2nd on accident 
did this one time and thats it, car seems good sounds good and everything is monitoring out fine, is it possible that i may have a bent pushrod from this? it seems that its not as noticeable of a noise or anything and i jsut wanna make sure. like it said it was only once and i cought it REALLY fast...
did this one time and thats it, car seems good sounds good and everything is monitoring out fine, is it possible that i may have a bent pushrod from this? it seems that its not as noticeable of a noise or anything and i jsut wanna make sure. like it said it was only once and i cought it REALLY fast...
Originally Posted by TILEMAN
Hey Silver, missing 3rd will get ya every time.
On The Tree
Joined: Dec 2001
Posts: 193
Likes: 0
From: Southwestern, PA
Originally Posted by 2001 Pewter WS6
Keep watching your avatar, you will eventually get the hang of it. Hey Tileman, think you might be able to hold a class and teach him where the gears are so this doesn't happen again???
Originally Posted by 2002SilverWS-6
Well I went and changed my plugs to NGK tr55's and put on Taylor Thundervolt 10.4 wires and got rid of my random misfire code P0300 but now I am setting P0308 so does this mean that I only have a problem with #8 cylinder. My car is still breaking up at wot above 4700rpm in 3rd and 4th gear. I am going to swap the coil packs around to see if anything changes. Is there anything else I should do or look for. I don't think that I have a bent pushrod because the motor sounds quiet to me.
#5 cy and #8 cy doesn't sound random. That's pretty specific. Since the substitution method doesn't seem to be working you should try a compression and a leak down. Do you have EFI Live or did the GM dealer use a Tech 2 to get the DTC?
