I WAS GETTING A MULTIPLE MISFIRE CODE P0300

  • Tiny
  • Anonymous
  • 1996 Chevrolet Cheyenne
  • 160,000 miles

I was getting a multiple misfire code p0300.
Did a tune up, now I'm still getting p0308 misfire on cylinder 8.
I pulled the plug, which I just replaced along with cap, rotor and wires to find oil along the threads, and looks worn. But it's only a few days old. Any ideas where to go. Also truck smells of burning oil, no visable leaks. 305 vortec

Monday, December 31st, 2012 AT 12:04 AM

7 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Still 308? You only mentioned 300 first

Start with compression test. Check for spark to the plug as well

Roy

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Monday, December 31st, 2012 AT 12:18 AM
  • Tiny
  • Huntwalleye
  • Member

After my tune up, I've only gotten a p0308

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Monday, December 31st, 2012 AT 12:40 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Ok, is the plug gap correct?

Roy

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Monday, December 31st, 2012 AT 12:41 AM
  • Tiny
  • Huntwalleye
  • Member

Gapped to.06

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Monday, December 31st, 2012 AT 1:02 AM
  • Tiny
  • Huntwalleye
  • Member

I can wipe oil off the threads. Is that a sign of a leaky valve gasket?

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Monday, December 31st, 2012 AT 1:03 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Most likely. Is it leaking from the valve cover>?

Roy

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Monday, December 31st, 2012 AT 1:04 AM
  • Tiny
  • Huntwalleye
  • Member

Honestly Roy, I'm not sure how to tell.

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Monday, December 31st, 2012 AT 1:06 AM

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