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Old 12-07-2009, 08:16 PM
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odd sound

I just recently changed my tune to the 85hp performance tune from the 65hp economy tune its been on forever. Under hard acceleration right when i start to let off the gas, i hear a sound like a knocking, but it doesn't sound like a rod. Could it be my waste gate acting up? I've never heard this sound before with the other tune even when i would stomp on it. I don't really drive the truck hard at all. I was just toying around with it because I upped the tune. The truck drives fine otherwise. Any help would be appreciated.

Last edited by paulboydencustoms; 12-07-2009 at 08:26 PM.
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Old 12-08-2009, 10:14 AM
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The sound is fast like a machine gun, and it only lasts for a second
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Old 12-08-2009, 11:33 AM
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Sounds are very hard to diagnose over the internet without being there. Maybe you can post a audio file otherwise I am just guessing as is everyone else!!

NCH
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Old 12-14-2009, 08:10 AM
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are there any common sounds that happen when letting off the throttle?
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Old 12-14-2009, 08:12 AM
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injectors maybe????
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Old 12-14-2009, 10:30 AM
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Wastegate? Mine makes a noise after I let off but its not a knocking noise. You can hear my waste gate better with an aftermarket intake also.
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Old 12-14-2009, 10:40 AM
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WOW mine does the same thing!! I thought the lifters were trying to float!! I am subscribing because I took mine off and just left on 80 hp setting.... SO i am curious as to what you here??
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Old 12-14-2009, 11:19 AM
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Quote:
Originally Posted by markiebud View Post
WOW mine does the same thing!! I thought the lifters were trying to float!! I am subscribing because I took mine off and just left on 80 hp setting.... SO i am curious as to what you here??
sounds just like you described, like lifters or something, but why only when i let off the gas under boost. and i am running the 80hp setting aswell
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Old 12-14-2009, 11:33 AM
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Well I let off because of the noise and it sounds like you described as well....... The 140 hp setting scared that it was fixing to blow and I am not that brave!!
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Old 12-14-2009, 02:16 PM
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my truck doesnt smoke like it used to either
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