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Showing results for tags 'p0302'.
Okay so I have a 2008 GMC Sierra with 130 on a 5.3. It's my daily driver and now has some issues. Basically a misfire in cylinder 2 that I would like any good help with before I keep trying new things that might not work. So the stalibitrak and traction control lights also flash and are on regularly which started at the same time. Meanwhile the engine light has flashed for a couple seconds but is usually solid. It is a p0302 misfire. So far I have cleaned the MAF, checked for leaks, changed all spark plugs, coils, and wires, ran some seafoam through it at the brake booster line and some in the gastank. I pulled the new spark plug after it didn't work for inspection and it was very carbon fouled after 3 days and very little driving. It runs good at higher speeds but idles rough and loud I would say klunky. Has not stalled. So Does anyone have any ideas before I keep changing things that are not the problem? 2008 Chevy Silverado/ 08 GMC Sierra 5.3
So I had the truck make some noise and start a p0302 code as well as stabilitrak and traction control lights flashing. I understand that those lights can happen from the cpu shutting them off because of the misfire for some reason, based on other posters I have read. What I did: Brake switch Cleaned MAF Spark Plugs and Wires Coil Injector Inspected for vacuum leaks Poured some treatment in the oil and did a oil change Several tanks of premium fuel treated with b12 or Seafoam Seafoam in the brake booster line Took off the valve cover and cleaned the push rods and tried to put in some b12 chemtool, gently oiled clean push rods and put everything back together. Still have a p0302 and still rough idle. The noise and feel of the rough idle drives me nuts as my truck is pretty nice and I love it. I am planning on a lifter swap, I already ordered a Hynes manual and am looking at the lifters here: http://www.autopartswarehouse.com/shop_parts/valve_lifter/gmc/sierra_1500.html?redirect=1. Anyone have any advice on this as I prepare to undertake it? How long does something like this take? As of now I am hoping the cam shaft is still in good enough shape as the truck just started the rough idle recently. Anything else I need to replace while I am there?