1998 k1500 5.7 vortec pinging no codes

[drtyTshrt]

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Please listen close.
Is this detonation or some other valve train issue.

Just tuned
It did it before the tune as well.

I can not hear it good in the video but it is very consistent through the whole video.

New plugs, wires, billet distributor, coil, no codes.

 

[90halfton]

Guess I can't hear it. Have you tried adjusting timing? What afr are you running?

 

[drtyTshrt]

Guess I can't hear it. Have you tried adjusting timing? What afr are you running?

Timing is -2degrees not that far out but on the margin. Good call though, I had dismissed that.

What is AFR?

 

[90halfton]

Air fuel ratio. If it was tuned one would notice a lean condition ( sometimes causes pinging ) so that's likely not the issue, especially if it did it before tune as well.

 

[drtyTshrt]

The only thing left is to change the original poppets out for the new style injectors.

Magna flow Stainless Cat back is new but it pinged before that as well.

 

[90halfton]

Did you take it to a tuner? They should have noticed the ping and been able to rectify it assuming it's a fuel or detonation issue and not a mechanical flaw.

 

[90halfton]

How many miles on the motor?

 

[drtyTshrt]

Did you take it to a tuner? They should have noticed the ping and been able to rectify it assuming it's a fuel or detonation issue and not a mechanical flaw.

How many miles on the motor?

A mechanic set the timing after I did all of the wrenching. My scanner will not tell me the timing.

I just turned 170,000. The original fuel pump died at 168,500

I wish the noise was better heard in the video. It can be heard real good at the beginning but it is there through the entire video.

 

[90halfton]

Wish I could hear it. When you say it was tuned, do you mean put on a dyno, and the computer was altered? Or do you just mean tuned up with new ignition stuff? I'm not a mechanic by profession, just a guy who has always had to wrench on stuff and is trying to help ya trace steps here.

 

[90halfton]

Did the plugs have excessive carbon build up on them. Too much carbon in the cylinder can cause a ping, hard to imagine on a fuel injected motor with only 170k miles though.