cylinder 2 misfire?!?

Discussion in 'Chevy Suburban Forum (GMC Yukon XL)' started by janikphoto, Jan 1, 2012.

  1. janikphoto

    janikphoto Rockstar 3 Years 100 Posts

    I keep getting a code when driving on the highway... I think it is p0302 off the top of my head. Whether or not I remembered the correct number, it is a code for cylinder number two misfire. So, I went through all the obvious maintenance: changed plugs, wires and rotor/distributor. The truck runs MUCH better, but I'm still getting the code while driving around 60-65mph on the highway. What am I missing?!?
     
  2. Conlan Rose

    Conlan Rose Rockstar 3 Years 1000 Posts

    you made sure the timing isnt off right. hmm im trying to find info on what might be wrong.
     
  3. janikphoto

    janikphoto Rockstar 3 Years 100 Posts

    I haven't checked timing yet. It runs strong and only throws the code on the highway, so I didn't even think about the timing. I used to have a nice timing light, but someone stole it....
     
  4. Conlan Rose

    Conlan Rose Rockstar 3 Years 1000 Posts

    i really dont know if its timing but why not check after replacing ignition system. another problem might be the MAP sensor i would make sure that is all good.
     
  5. dedmon27

    dedmon27 Rockstar 100 Posts

    My guess would be a bad coil above #2. Seen this before on a 2002 trailblazer. Don't think your timing is adjustable.
     
  6. janikphoto

    janikphoto Rockstar 3 Years 100 Posts

    1999 doesn't have coil packs. It's old-school with a single coil and a distributor. If it were like my BMW with individual coil packs, that would've been my second guess - after changing the plugs. Good suggestion, though...
     

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