slideways Posted 3 hours ago Report Share Posted 3 hours ago My 2008 has been doing this for almost 10years now but its so consistent that i'd like to actually fix it at some point. At low rpm when lugging the engine or basically cruising in O/D at any time or in any gear it will thump in the floorboard which is most certainly a misfire. The great thing is it never throws codes for it. Years ago i replaced the plugs around 100k which cured the heavy symptoms. Then at some point around 150-175 i replaced all 6 coils/plugs. Around 190k it actually threw a misfire code for a bad injector which i changed. At 195k i had all injectors replaced when i had my water pump job done as PM. Car has also had the OSS/TSS sensors done in the transmission. Basically at 218k this vehicle has had all of the items done that should cause this problem and still misfires religiously with no codes. Does the PCM itself actually control spark to the point where it would be the last item to change? I have never "fried" a coil that would have damaged it and the problem has continued throughout the last 120k miles of this thing's life despite all these parts being changed. Quote Link to comment Share on other sites More sharing options...
1004ron Posted 2 hours ago Report Share Posted 2 hours ago What are you using to read codes? What spark plugs are you using and where do you purchase them from? Quote Link to comment Share on other sites More sharing options...
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