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1998 Chevy Silverado Engine Misfire Code

Tiny
GRYANJUDD
  • MEMBER
  • 1998 CHEVROLET SILVERADO
  • V8
  • 4WD
  • AUTOMATIC
  • 70,000 MILES
My check engine light came a about 3 months ago and I had the code checked and it said cylinder 5 was misfireing. I changed the spark plugs to the recomended plugs and changed fuel fliter due to the age of the truck. It still says same engine code. Cylinders 5 & 7 plugs are extremley coreoded and I have to clean them monthly, all other plugs are perfectly clean. After I replaced the fuel fliter I have started to shoot black soot out of the tail pipe. What do you think would be causing this? CO detector, piston rings? Anything would help
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Thursday, January 21st, 2010 AT 11:55 AM

5 Replies

Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
Check compression on 5-7
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Thursday, January 21st, 2010 AT 12:05 PM
Tiny
GRYANJUDD
  • MEMBER
  • 3 POSTS
I have allready checked. 5 & & have 50lbs and the other have 118 if I remember right.
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Thursday, January 21st, 2010 AT 12:42 PM
Tiny
DOCFIXIT
  • MECHANIC
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Well there is your answer should be @145+ 50psi is not going to ingnite and 118 barely.
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Thursday, January 21st, 2010 AT 1:17 PM
Tiny
GRYANJUDD
  • MEMBER
  • 3 POSTS
So what is the first thing I should do to fix it?
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Thursday, January 21st, 2010 AT 1:41 PM
Tiny
DOCFIXIT
  • MECHANIC
  • 18,828 POSTS
A cylinder leak down test would tell if burnt valves or rings. Otherwise need to pull head check valve seats and valves for warpage.
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Thursday, January 21st, 2010 AT 1:50 PM

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