misfire
#1
misfire
03 1500HD crew 75,000 highway miles. Engine warning light comes on at 65mph and above goes off below 65.The code says misfire on #1 and #6.The truck has new plugs/wires the dealer checked the coils,injectors and sensors. The dealer suspects carbon build up on valves and the only way to confirm this is with a $600.00 tear down and then a $2000.00 plus valve job to fix the problem. I know there is an induction cleaner but the dealer doubts that it will work. What if I don't fix it? I burn quality fuel ( BP and Mobil) use full synthetic oil there is no reason I should be doing major engine work at 75,000 miles. Any other options? Thanks in advance.
#7
RE: misfire
so how do you know if you have a intake leak i have a 2004 2500hd with a 6.0liter in it and I am have a lean code po171 and p0300 random misfire code the frist thing i thougth was vac. leaks but did not find any. does any one have any ideas?
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#9
RE: misfire
Had same problem at about 70mph code read misfire change injectors on cylinder with the misfire no more problem. Since I know how to do it that's why I did mine's you may want to try a injector flush first.
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