Engine Probs. What's This Sound Like? (video)

[91350burb]

1997 K1500 with the 5.7 Vortec. about 165k. After this started I changed the spark plugs to no avail. I have a feeling its something worse such as a bent valve or something. It happend when I floored it from a stop to get ahead of someone while I was fully loaded with two dirtbikes, gear, 10 gallons of gas for the bikes plus a full tank in the truck. Only code I pulled was a P0100 (MAF) and P0300 (random misfire). Cleared the codes and now there is no code granted I haven't tried driving it for fear of doing more damage.


https://www.youtube.com/watch?v=DBaE3di9s8g

 

[df2x4]

Wow. That sounds really, really bad to me. If you want the best chance of being able to rebuild that block I would not run it any more. Sorry I can't be of more help than that, I'm no mechanic. Hope you get it figured out and the block is OK. I'm sure someone else here can give you some more useful information.

 

[badazzbulldog]

does it have a strong gas smell from the exhaust?

 

[tunedbytuna]

I went thru a similar misfire issue, mine sounded about the same-I thought it was done. After doing a compression test, checking all the plugs, and checking to see if I had a leaky fuel injector I learned that I had a bad distributor cap. Have you changed the cap & rotor recently? These are notorious for having misfires in the cap, poor design and moisture gets into the cap.


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[mistaake]

Damn, that sounds terrible. I don't have anything useful to add, sorry.

 

[skylark]

That sounds like a dead hole with reversion through the intake manifold. Or you have multiple loose spark plugs. My money is on an intake valve issue.

 

[SAATR]

Sounds like the valve events are off. Possibly a stretched timing chain, may have jumped a tooth, or possibly moved the distributor. Bent valves are a possibility, but I would pull the distributor cap and valve covers and check to see if it is still in time on the distributor relative to the crank.

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[skylark]

Sounds like the valve events are off. Possibly a stretched timing chain, may have jumped a tooth, or possibly moved the distributor. Bent valves are a possibility, but I would pull the distributor cap and valve covers and check to see if it is still in time on the distributor relative to the crank.

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Good point on jumping a tooth.