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Hello everyone i have a 97 chevy with the vortec 5.7 i think i have a burnt valve but would like some feedback heres what i have done with thr truck running i pulled the plug wires from the cap one by one and all seemed to fire except #8 i pulled all plugs and all where white except #8 it was black my truck does run lean can anyone point me in the right direction thanks everyone in advance

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To rule out a bad valve do a compression test on all cylinders. Secondly, these Vortec engines fuel injection system work on a poppet valve system and if either fuel pressure, a clogged poppet valve stuck open or close the misfire code will come on i assume yours must be closed since you get a lean condition. This is my fix and and excellent one at that. Go to the Autozone website and type in all your truck info and go under fuel injection parts, you will find somewhere that there is a conversion kit made by a company called Sorensen, this kit converts the system from the troubled poppet valve to a true multi fuel injection unit, your engine will run much smoother and wont be prone to a sticking valve. Now the job itself is pretty big as u ned to remove upper and lower intakes. On my van with the vortec 5.0 i purschased the upper intake which is not to expensive and the bottom intake i just cleaned and made sure none of the EGR oassage ways were obstructed with carbon, they were! Make sure you mark the dsitributor as you would need a good scanner to re set timing if timing is moved, happened to me. Discinnect battery as well. If you have a pick up its much easier to work on than a van. By the way my MPG improved with this new upgrade. GM also knew they messed up with this system and they also offer an upgrade kit but its too expensive for me, this upgrade has been on my van 4 years no problem, good luck.

Posted on Nov 26, 2014

  • Josh j Nov 26, 2014

    Is there any way to do a compression test without special tools or taking it to a mechanic. Thanks for all the help

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Try holding a single sheet of paper about an inch from the tailpipe. If the paper gets sucked toward the tailpipe when the miss occurs, this is another indication of a burnt/leaking valve. It means an exhaust valve is leaking on the intake stroke.

Posted on Nov 25, 2014

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  • Josh j Nov 25, 2014

    Ok thanks ill try that

  • Josh j Nov 26, 2014

    I did the paper infront of my exhaust and it didnt suck the paper to it so im guessing that means no burnt valve so on to something else

  • Josh j Nov 26, 2014

    Hav also noticed with truck running my harmonic balancer looks warped but with truck off there is no movement and even tried tighting it up its tight is that a bad crankshaft?

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Hi there,
even if your car runs smooth it does mean that has no issue.
in fact when you require more power then it is when plugs have to fire more ,so no power equal more spending in gas and other factor.
the plug have to be replaced of course and unfortunately you need a specialized person to perform it unless you have the right knowledge to do it.
good luck and do not forget to Zkeep calm ,the best on Fixya.
thanks

Posted on Nov 25, 2014

  • Josh j Nov 26, 2014

    I have a couple of problems first one is #8 cylinder isnt firing and my harmonic balancer has a wobble is that a bad crankshaft

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Could be a bad wire or cracked coil pack.if you can check the voltage on #8 you can even use a timming light

Posted on Nov 25, 2014

  • Josh j Nov 25, 2014

    I switched the wires just to be sure nothing on #8. Doesnt smoke which is why i stumped no smoke means no burnt valve right. Havent checked timing runs ok just doesnt have no power but has over 300,000 miles

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