Holy bejeezus! It IS injector hammer!!! What to do? - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 12-15-2006, 01:47 PM Thread Starter
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Holy bejeezus! It IS injector hammer!!! What to do?

I had other threads about tracking down what seemed to be a new mechanical sound coming from my engine. It seemed worse when the temps were cold (in the teens at night), but it would get better as the engine warmed up. In cold weather (below 40) it would seem to be there at some level. It sounded like a mechanical knock that was coming from the engine, and possibly even a single cylinder. After reading the posts here, some said it was injector hammer, but one hinted at piston slap. It sounded so mechanical, I thought for sure it was piston slap.

Today, the outside temp was in the 60's. The knock was non-existant, even when the truck was started cold this morning. The engine ran smooth, and it sounded like my old engine (I bought the truck used this past summer).

Ok, so what are the cures?

Also, what's the diagnostic box some of the guys here are building to cut out injectors? Do they simple ground the signal going to the injector? Maybe I can track it down to a single cylinder.

1999 F250 Crew Cab PowerStroke Diesel with Banks turbo, control modules, and exhaust.
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post #2 of 19 Old 02-08-2013, 08:45 AM
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I wish somebody had an idea what was causing your issue because mine has the exact same issue.

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post #3 of 19 Old 02-08-2013, 09:51 AM
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hutch mod

Welcome to guzzle's In-tank Hutch Mod Web Page

You dont need the lift pump, but you'll want some type of pre-filter b4 pump. I think its a 330007 filter from Napa or a spin on filter. I'm run'n a 15mic spin on, so pump will last.

Also, if you wanna get creative, is to re-route the d/s fuel line, to the back port of the head. This eliminates the #8 from being starved, or do a regulated reutrn OR FRx..but do the Hutch mod.

Riffraff Diesel: Fuel Rail Crossover™

99.5 x-cab 7.3l, 6spd, 161k miles.....
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post #4 of 19 Old 02-08-2013, 02:05 PM
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Re: Holy bejeezus! It IS injector hammer!!! What to do?

get a thinner oil first. Then go from there.
You might have a cracked pick up tube letting air in the fuel.

I made my Samsung SGH-I997 send this.



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
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post #5 of 19 Old 05-27-2014, 05:25 AM
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I am having the same problem with my 2001 with 240K miles. It is much more noticeable when cold outside, even this weekend with temps in the mid to upper 80s it was still noticeable on first start up even though not as bad when cold outside. I am running Amsoil 15W-40, still original fuel pump and I change filter regularly. I have the FRX and HPX mods. What is the normal life of the fuel pump? would it be worth it to start there instead of the Hutch Mod? Really not looking forward to dropping the tank unless I absolutely have to.
Thanks!
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post #6 of 19 Old 05-27-2014, 07:41 AM
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What is your oil change interval?



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #7 of 19 Old 05-27-2014, 08:10 AM
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I usually change yearly or 25K miles but I run a 2 filter by pass system and send oil off for analysis about every 4-6K miles. The length of time on the oil seems to have no effect on the knock frequency or severity, mainly temprature.
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post #8 of 19 Old 05-27-2014, 08:16 AM
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So fresh oil doesn't make it better?



2000 F-350 Lariat Super Duty, Dually, CCLB, 7.3L
4R100, 2wd
330,000 + miles
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post #9 of 19 Old 05-27-2014, 08:20 AM
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Not from what I have experienced, have not tried a thinner oil though. I am thinking a fuel problem, just really not wanting to drop the tank unless a last resort
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post #10 of 19 Old 05-27-2014, 08:21 AM
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Even changing HPOP oil didnt seem to help mine.
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