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02-22-2011, 09:16 PM
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#1 |
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Registered User
Join Date: Nov 2010
Location: Fresno California
Posts: 65
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Keep Getting VERY Bad spark bridged plugs in #5 and #7
I keep getting miss fires and cant find them. I pulled the plugs again for the second time after changing them and they are completley covered in crap. Do i have something wrong with the valves i have some bad missfires. Thanks
__________________
 1986 GMC Sierra Classic 4X4
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02-22-2011, 09:20 PM
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#2 |
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Account Suspended
 Join Date: Apr 2009
Location: lexington South Carolina
Posts: 2,124
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
i had the same problem with my 305 then like a month later i put a 350 in it mine it ended up mixing water and oil for the second time in 3 years and it was wore out
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02-22-2011, 09:22 PM
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#3 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
That looks a lot like a spark plug from a very worn out engine. The gunk is likely burnt oil. Do a compression test. Does the truck smoke at all?
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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02-22-2011, 09:27 PM
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#4 |
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Account Suspended
Join Date: Apr 2009
Location: lexington South Carolina
Posts: 2,124
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
it probably did cus mine had the same thing as his
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02-22-2011, 09:57 PM
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#5 |
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Registered User
Join Date: Nov 2010
Location: Fresno California
Posts: 65
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
I also forgot to mention that in the morning when its cold, it has a clicking noise sounds maybe like a lifter. Maybe that could have something to do with it.
__________________
1986 GMC Sierra Classic 4X4
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02-22-2011, 10:00 PM
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#6 |
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Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,948
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
Everything your saying is just symptoms of a worn engine. I would start preparing for either a replacement or a rebuild.
__________________
Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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02-22-2011, 10:09 PM
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#7 | |
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Account Suspended
Join Date: Apr 2009
Location: lexington South Carolina
Posts: 2,124
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
Quote:
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02-22-2011, 10:17 PM
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#8 |
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Registered User
Join Date: Nov 2010
Location: Venus Texas
Posts: 217
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
I changed the oil on a cold 79 350 once (never again). Ran fine before the change. Started lifter noises after. Babied it for about 2 weeks, the noise went away. I could only imagine the wear it took on the cam. It started fouling #1 and #7 I believe. I adjusted the rockers to run it further, then traded the truck. Check'em while its running and see if it helps. Hopefully its not the other.
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02-23-2011, 12:24 AM
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#9 |
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Registered User
Join Date: May 2010
Location: Ogden, Utah
Posts: 219
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Re: Keep Getting VERY Bad spark bridged plugs in #5 and #7
Not sure, but it might be worn valve guides... but that would be like one or two cylinders not all.... if it is one or two you could try running hotter plugs to burn that oil off and start preparing for a rebuild..
__________________
84 K20 Long Box W.I.P  78 Burb - parts now [Rolled] 68 c20 dump bed  WHEN IN DOUBT--- FLOOR IT 
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