6.9l injector knock?
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New User
Joined: Jun 2006
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6.9l injector knock?
So I am trying to track down if I have an injector that is causing my knocking sound. I recently swapped in a 6.9 and this is the first time I have heard it run. So after getting it warmed up I started pulling out the injectors to see what I could find. 7 had fuel on them and 1 was dry. The other interesting one was the one closest to the driver, it has an interesting pattern of build up along the injector. It was also a real bear to get out. I was wondering if someone could enlighten me on what the injector should look like after the engine is warmed up. Should there be moisture on the ends or should it be drier? In the picture, the left one is the one that is dry, the right one has the build up on it.
Elder User
Joined: Aug 2007
Posts: 589
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From: Nutter Fort,West Virginia
looks like carbon build up, when you put them back in you need to replace the copper washer at the bottom (or at least anneal it).
have you ever heard a 6.9l idi run when starting? they can be quite noisy
have you ever heard a 6.9l idi run when starting? they can be quite noisy
Logistics Pro
Joined: Sep 2010
Posts: 4,411
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From: Victor, MT
when a 6.9/7.3 starts there is no oil in the crankcase of everything is smacking around in there til the oil gets there....it sounds powerstroke some ppl say...i just say it sounds really clacky...
New User
Joined: Dec 2004
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When I bought my 1979 240D it knocked on startup. REALLY knocked. Thats why the PO sold it. (for cheap!) I didnt know what it was, but since the knock went away after the engine warmed up I bought the car. If worst came to worst I was prepared to take it apart and fix it.
But I drove it like that for two years. When I saw rebuilt injectors for like $25 each I treated the car to them.
The knock went away.
You can get eight rebuilt injectors for the IDI and if mine was running like that, thats what Id do.
They are like $120 for all 8.
But I drove it like that for two years. When I saw rebuilt injectors for like $25 each I treated the car to them.
The knock went away.
You can get eight rebuilt injectors for the IDI and if mine was running like that, thats what Id do.
They are like $120 for all 8.
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