Loud rattling 'tin can' sound - starboard 5.7L VP

[tzylka88]

I have a 2009 Cobalt 303 w/ twin 5.7L VPs. When I get above 4500 rpms the starboard engine will make this intermittent loud rattling 'tin can' sound. It literally sounds like a large tin can rattling around the engine compartment. When I continue to throttle up the sound happens more often and more consistently. Performance is not affected, water temp is fine, oil pressure fine. Under 4500 rpms - no sound. Any ideas appreciated!

Todd

 

[Don S]

Re: Loud rattling 'tin can' sound - starboard 5.7L VP

You better get it fixed before you burn holes in the pistons. Sounds like detonation, or pre ignition.

How about some engine information, model number, serial number.

 

[tzylka88]

Re: Loud rattling 'tin can' sound - starboard 5.7L VP

2009 - Twin 5.7L GXi DP; 4012220414 or ...415 (not sure which is starboard motor).

 

[Don S]

Re: Loud rattling 'tin can' sound - starboard 5.7L VP

Might want to recheck your numbers. Those serial numbers come back as a 5.0L , not 5.7. and they are from 2006/7

 

[tzylka88]

Re: Loud rattling 'tin can' sound - starboard 5.7L VP

4012250415 & 4012250414. I added and extra '2' by mistake.

 

[Don S]

Re: Loud rattling 'tin can' sound - starboard 5.7L VP

That's for a 5.7OSi-300-J engine. Can't really help you with that one, no information on the EFI system for that new an engine.