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I was getting a multiple misfire code P0300

Tiny
ANONYMOUS
  • MEMBER
  • 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
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Monday, December 31st, 2012 AT 12:04 AM

7 Replies

Tiny
ASEMASTER6371
  • MECHANIC
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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
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After my tune up, I've only gotten a p0308
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Monday, December 31st, 2012 AT 12:40 AM
Tiny
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Ok, is the plug gap correct?

Roy
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Monday, December 31st, 2012 AT 12:41 AM
Tiny
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Gapped to.06
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Monday, December 31st, 2012 AT 1:02 AM
Tiny
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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
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Most likely. Is it leaking from the valve cover>?

Roy
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Monday, December 31st, 2012 AT 1:04 AM
Tiny
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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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