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97 chevy vortec 5.7. Can someone tell me why #8 cylinders not firing i changed cap rotor and even switched plug wires thinkin it was the wires no change plug is black all the rest are white doesnt smoke but has a loss of power cant afford a compression test is there any other way to figure it out without tearing into the engine

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  • Cars & Trucks Master
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When you say the #8 plug is black it tells me that you may have a broken piston ring that damaged the #8 cylinder wall to the point where oil is coming up and fouling the plug, along with NO compression, or you may have bad valve seals or a bent valve. A compression test would be the best way to go now, and testers are not expensive, you can go to an auto parts store where they will rent you a compression tester. I am only guessing, and you may have to go into the engine, with a possible rebuild or replacement forthcoming. GOOD LUCK FRIEND.

Posted on Nov 28, 2014

  • Josh j Nov 28, 2014

    Thanks looks like thats what i gotta do

  • Josh j Nov 29, 2014

    Doesnt smoke can it have a broken ring and not smoke

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  • Contributor
  • 31 Answers

If the end of the sparkplug is back, indicates carbon build up. Buy a compression tester, way cheaper and easier, although I'm not sure if it is a head gasket. What color is the smoke that comes out of the tailpipe, a greyish blueish or is it black? Does the engine shudder? Where the spark plugs themselves changed and gapped correctly? It may be detonation also.

Posted on Nov 28, 2014

  • Josh j Nov 28, 2014

    Doesnt smoke at all does have detonation because its running lean on bank one and two all plugs are a whitish color except #8 its black and got oil

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How have you determined that #8 is not firing? Normally if you have a coolant leak into a cylinder the spart plug from that cylinder will have white deposits from the burned anitfreeze. Check to make sure that you have spark on that cylinder. If not, the new wires or cap you installed might have a problem or not be seated fully.

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