LB7: Excessive Knock

[Lance LB7]

I've owned my truck for 2 and a half years now and it has always been louder than it should be. strictly speaking of motor noise. noise is not more prevalent at idle or any RPM. sounds like an early 7.3 in cab. truck was stock tuned for 1.5 years before EFI and nothing changed. injectors have 32k on them and are apparently 50% over. my guess is maybe a shotty set of injectors? thanks in advance for any help.

03 LB7
Single Cab
ZF6
500 Hp Single disc
EFI Live
Airdog 150
BD Power High Flow manifolds, 50% over injectors, banks big head, head steads

 

[j.stanton2009]

I've owned my truck for 2 and a half years now and it has always been louder than it should be. strictly speaking of motor noise. noise is not more prevalent at idle or any RPM. sounds like an early 7.3 in cab. truck was stock tuned for 1.5 years before EFI and nothing changed. injectors have 32k on them and are apparently 50% over. my guess is maybe a shotty set of injectors? thanks in advance for any help.

03 LB7
Single Cab
ZF6
500 Hp Single disc
EFI Live
Airdog 150
BD Power High Flow manifolds, 50% over injectors, banks big head, head steads

What brand injectors?

 

[SickLL7Crenshaw]

What brand injectors?

X2

Sent from my B15 using Tapatalk

 

[Lance LB7]

What brand injectors?

Im not sure what kind man. I bought the truck with 171k and they said were done less than 10k ago.

 

[j.stanton2009]

Im not sure what kind man. I bought the truck with 171k and they said were done less than 10k ago.

Does it smoke excessively at idle or low throttle?

 

[Lance LB7]

Does it smoke excessively at idle or low throttle?

nope. it actually hardly smokes at all. My biggest tune is about a 200 hp tune and even it only grey hazes. no smoke at idle or anywhere else.

 

[j.stanton2009]

nope. it actually hardly smokes at all. My biggest tune is about a 200 hp tune and even it only grey hazes. no smoke at idle or anywhere else.

I honestly couldn't give you the correct diagnoses. It sounded like a stuck injector at first.

If the truck driveable; I couldn't imagine it being a broken crank or a spun bearing,

 

[Texas Chevy]

Every run any kind of fuel additive?

 

[Lance LB7]

Yeah I definitely don't think its any internal hard parts creating the knock. My guess is it has to be something in the injection system. It doesn't sound as violent as a hung open injector, but maybe a much more mild version of that. But yes I've run power service, lucas, 2 stroke oil. any other ideas?

 

[Ne-max]

50 over injectors would be smokey if truck was not tuned for them.

 

[Lance LB7]

Problem Solved

Pulled the rubber boot around the shifter and there was no insulation around the hole in the floor or shifter linkage. insulated it up with dynamat and put the boot back on. Unbelievable how much noise came through there.