odd sound - Ford Powerstroke Diesel Forum

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post #1 of 40 Old 12-07-2009, 08:16 PM Thread Starter
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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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post #2 of 40 Old 12-08-2009, 10:14 AM Thread Starter
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The sound is fast like a machine gun, and it only lasts for a second

2008 F250 Lariat super cab long bed FX4
K&N intake
Spartan Tuner


(last truck)
Early 99 2wd f350 Lariat long bed dually
22.5 Alcoa's
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bully dog intake
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HID's in headlights and fogs




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post #3 of 40 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!!

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post #4 of 40 Old 12-14-2009, 08:10 AM Thread Starter
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are there any common sounds that happen when letting off the throttle?

2008 F250 Lariat super cab long bed FX4
K&N intake
Spartan Tuner


(last truck)
Early 99 2wd f350 Lariat long bed dually
22.5 Alcoa's
diablo sport predator
bully dog intake
zoodad
6" stacks
6" Fabtech Lift
Fabtech trac bars
Fabtech steering dampner
map fooler
gauges
2006 front end
HID's in headlights and fogs




http://www.mileanhour.com
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post #5 of 40 Old 12-14-2009, 08:12 AM
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injectors maybe????

2008 F250 6.4 CC SB Fx4
Gearhead tunes, flopro exhaust,AFe intake
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post #6 of 40 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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post #7 of 40 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??

2000 F250 CC 4x4
7.3 Powerstroke
6 pos TS
muffler delete
DIY Intake
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post #8 of 40 Old 12-14-2009, 11:19 AM Thread Starter
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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

2008 F250 Lariat super cab long bed FX4
K&N intake
Spartan Tuner


(last truck)
Early 99 2wd f350 Lariat long bed dually
22.5 Alcoa's
diablo sport predator
bully dog intake
zoodad
6" stacks
6" Fabtech Lift
Fabtech trac bars
Fabtech steering dampner
map fooler
gauges
2006 front end
HID's in headlights and fogs




http://www.mileanhour.com
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post #9 of 40 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!!

2000 F250 CC 4x4
7.3 Powerstroke
6 pos TS
muffler delete
DIY Intake
3 inch lift with 35x20s
Little Rock Ar
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post #10 of 40 Old 12-14-2009, 02:16 PM Thread Starter
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my truck doesnt smoke like it used to either

2008 F250 Lariat super cab long bed FX4
K&N intake
Spartan Tuner


(last truck)
Early 99 2wd f350 Lariat long bed dually
22.5 Alcoa's
diablo sport predator
bully dog intake
zoodad
6" stacks
6" Fabtech Lift
Fabtech trac bars
Fabtech steering dampner
map fooler
gauges
2006 front end
HID's in headlights and fogs




http://www.mileanhour.com
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