Guess the sound?

[CountryBoy19]

Hmm... that makes me wonder... I have a "tinny" sound when I get on it... I assumed it was piston slap but I don't know that I've ever heard what piston slap actually sounds like. I wonder if it's just a heat-shield.

 

[Doubeleive]

Hmm... that makes me wonder... I have a "tinny" sound when I get on it... I assumed it was piston slap but I don't know that I've ever heard what piston slap actually sounds like. I wonder if it's just a heat-shield.

check around the back of the engine bay and down towards the exhaust manifolds, I had mine smacking against the exhaust before just bent it back a little and noise was gone, but the sound it made was terrible

 

[PG01]

Hmm... that makes me wonder... I have a "tinny" sound when I get on it... I assumed it was piston slap but I don't know that I've ever heard what piston slap actually sounds like. I wonder if it's just a heat-shield.

When you get on it? Sure its not pinging? Just an idea...

 

[CountryBoy19]

When you get on it? Sure its not pinging? Just an idea...

I guess it's possible... it's only at or near WOT

 

[SnowDrifter]

I guess it's possible... it's only at or near WOT

If you don't have access to a scan tool to check, easy route is to toss premium in there next fill up and evaluate

 

[CountryBoy19]

If you don't have access to a scan tool to check, easy route is to toss premium in there next fill up and evaluate

I have a Tech 2, where do I check for that?

Am I just looking at timing numbers or is there a specific place/procedure to watch for detonation?

 

[CountryBoy19]

I have a Tech 2, where do I check for that?

Am I just looking at timing numbers or is there a specific place/procedure to watch for detonation?

@SnowDrifter

 

[SnowDrifter]

There should be something in there to let you see live data. Look at misfires, timing advance, and knock retard. Also pull up your oxygen sensor voltage. If it's hanging near 0v, it's lean. If it's hanging near 1v, it's rich. Bouncing between the two is normal, if it's constantly at one extreme or the other, it might warrant further investigation.

 

[Doubeleive]

so I was having the Yukon transmission and transfer case flushed today so I drove the Silverado around and kept hearing a rattling noise (again), thought maybe the heatshield had come loose again, got underneath there and banged on it nope...this time it was a broken heat shield on the driver side cat, only rattled under load. went by the muffler shop and they it back up for free. now I think it needs a a/c tensioner sounds like your killing a cat for the first 10-15 minutes in the morning