#8 LL injector question
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From: Circle Pines
#8 LL injector question
I just bought my truck 1 1/2 years ago and have a simple question. Since these trucks have a dead end fuel system from the factory, do they come with a LL injector in the two end cylinders from the factory(8 and not sure the #on the other side). The reason I am asking is the truck seems to be getting a little louder each month and I am thinking since I did the ITP reg return that I need to change the LL's out. Thanks
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From: Carhenge
Only in the #8 hole, and your 99.5 may not have one at all unless it was at the dealer for "cackle".
From the "cackle" TSB 03-21-39:
"Some vehicles equipped with a 7.3L Powerstroke diesel engine with engine serial number 661894 through 1311240, may exhibit a noise above the normal sound of the diesel combustion. This noise may sound like a rod knock, but it is intermittent and increases in intensity as the engine warms up to operating temperature. This "cackle" noise may by caused by pressure variation within the fuel rail and in virtually all instances is attributed to cylinder #8 (driver side rear). The "cackle" noise does not cause damage the engine, or impact the engine's performance or economy.
Engines after serial number 1311240 were built with a long lead injector in cylinder #8 and correct calibration from the factory. It is possible for engines with the long lead injector, from the factory or installed in service, to exhibit a "lifter noise" (the long lead injector can be identified by the "LL" stamp on top of the solenoid.) This noise is typically most noticeable when the vehicle is parked next to a brick or concrete wall, such as at a fast food drive through. This noise is a normal characteristic of the long lead injector and is not a reason to replace the injector."
From the "cackle" TSB 03-21-39:
"Some vehicles equipped with a 7.3L Powerstroke diesel engine with engine serial number 661894 through 1311240, may exhibit a noise above the normal sound of the diesel combustion. This noise may sound like a rod knock, but it is intermittent and increases in intensity as the engine warms up to operating temperature. This "cackle" noise may by caused by pressure variation within the fuel rail and in virtually all instances is attributed to cylinder #8 (driver side rear). The "cackle" noise does not cause damage the engine, or impact the engine's performance or economy.
Engines after serial number 1311240 were built with a long lead injector in cylinder #8 and correct calibration from the factory. It is possible for engines with the long lead injector, from the factory or installed in service, to exhibit a "lifter noise" (the long lead injector can be identified by the "LL" stamp on top of the solenoid.) This noise is typically most noticeable when the vehicle is parked next to a brick or concrete wall, such as at a fast food drive through. This noise is a normal characteristic of the long lead injector and is not a reason to replace the injector."
Last edited by clux; Feb 4, 2008 at 10:16 PM.
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From: King George, Virginia
Originally Posted by Pocket
There's only one LL injector, and it's on #8. The passenger's side fuel rail is not a dead end setup like the driver's side. However, I can't remember if the 99's came with the LL or not.
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From: Circle Pines
Originally Posted by Tenn01PSD350
I know mine was a dead end on both sides when I modded it.
Last edited by mndiesel; Feb 4, 2008 at 10:26 PM.
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Post Fiend
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From: Carhenge
Originally Posted by Lead Head
I'm of no help in this thread, but I was wondering if anyone could explain what an "LL" injector is, and what it does?
Last edited by clux; Feb 4, 2008 at 10:29 PM.
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Post Fiend
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From: Middle Tennessee
Originally Posted by Lead Head
I'm of no help in this thread, but I was wondering if anyone could explain what an "LL" injector is, and what it does?
So there is a machined portion of the split shot injector that would bleed of oil pressure momentarily, suspending fuel injection, then the rest of the shot would go.
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