6.0l Engine Noises

[rattlindodge]

So my 04 Silverado ss has this noise. First you will only hear it when the engine is under a load , so like when it shifts into say 4th and the engine feels to be making the most torque, if i put my foot into it as much possible before it down shifts , it gets slightly worse. Its hard to tell if the noise is there at hi rpm. This noise is kinda like a bearing or rattle/wobble noise?

 

2nd today i was messing around with the truck and decided to rev it up in park, not to redline but a pretty good rev and it sounded like something was rattling around in the engine. I was at probably 2k and quickly revved to 4k, when the engine was un revving is when it made the noise. Any ideas?

 

 

It seems to idle just fine and runs good, no noise at idle.

Edited August 22, 2008 by rattlindodge (see edit history)

[badass03ss]

what octane fuel are you using?

[rattlindodge]

also i just had an engine code p0430 , it turned out to be a bad mass airflow censor. I cleared that code and have only driving 10 miles.

[rattlindodge]

87 i think, the cheapest of the 3 fuels

[badass03ss]

need to run high octane fuel unless you have the pcm tuned to run the cheap stuff

[rattlindodge]

dang i just filled it up, well ill remember that come next fill up. So im detonating then?

Edited August 22, 2008 by rattlindodge (see edit history)

[badass03ss]

sounds like it

[Jond983]

i've had a question about gas in the SS' for the longest...is premium fuel recommended for bone stock SS'?

[rattlindodge]

well mine has k&n air filter and different exhaust if that makes a difference

[FireRescueSS]

i've had a question about gas in the SS' for the longest...is premium fuel recommended for bone stock SS'?

 

 

Yup. Mine won't run on anything but, and it only has a CAI, wouldn't run on the cheap stuff before that either.

[badass03ss]

Yup. Mine won't run on anything but, and it only has a CAI, wouldn't run on the cheap stuff before that either.

yea,, what he said

[Jond983]

that's what i thought, the truck has had premium since day 1, i also have it tuned for premium

[rattlindodge]

So i just filled it up again, with 90 octane. Is that enough octane, i thought that they used to sell like 92 octane for the good stuff at the pump?

[nxtnlne]

In your manual it states to run no less then 91 octane. It will run with 87 and 90 but your truck will ping. Best to go with the 91 or 92 whichever is availible.

[Fireman31]

Valve train noise is common with the LS based engines......yes 91+ Octane is required. Putting anything less then that in it is not going to save you anything. The LQ9 in these trucks has 10:1 compression = high octane fuel required. Low octane in these trucks = knock/ping/detonation = KR = less power, lower fuel economy, less efficiency.