Knock after injectors replaced
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Knock after injectors replaced
I just replaced all 8 injectors in my 01 F550 with remans from FFD. I have noticed a constant knock at idle but truck runs great. Blowby has no pressure behind it, truck does not smoke. Does this sound like a problem unrelated to an injector?
It did not make this noise before replacing the injectors
Any help is greatly appreciated!
It did not make this noise before replacing the injectors
Any help is greatly appreciated!
Last edited by Dirtscooter250; Dec 4, 2015 at 08:36 PM. Reason: Video added
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I am trying to get it to work, it says it is uploaded but it doesn't appear to be. Trying to fix!
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I installed the injectors, drove about 200 miles, then hot retorqued injectors and had maybe 1/8 turn on 3 and 5 cyl.
Rocker arms were not loose at all either; this stumps me!
Hotshot
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From: Puget Sound
Sometimes injectors are noisy, sometimes air gets in oil and it makes a knock. I didn't hear anything that my truck hasn't done for the last 80K miles - but it does come and go. Scott's truck makes the same noise.
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Sometimes injectors are noisy, sometimes air gets in oil and it makes a knock. I didn't hear anything that my truck hasn't done for the last 80K miles - but it does come and go. Scott's truck makes the same noise.
The Sound of Da Big Stink - YouTube
The Sound of Da Big Stink - YouTube
I was hoping one of the injectors was loose but i guess i was lucky. Could the noise be tied to oil brand/synthetic/weight?
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Hotshot
Joined: Jan 2011
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From: Puget Sound
I have found synthetic (any brand) to be a little noisier than dead dinos - but that's primarily because it's easier to cavitate the lighter oil if air is introduced. I believe my truck has a bad seal on the oil pick-up tube, and accelerating up a step grade results in a lot of knock for a while.
Lead Driver
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From: Amarillo, TEXAS!
Does it seem to get worse as it warms up? It hasn't been asked yet, so I'll ask: what type of injectors did you put in? Are they stock injectors? Are they all the same, or is one of them a long lead? If one is a long lead, did it get installed in cylinder #8?
Hotshot
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Good questions - I completely space off the possibility of air in fuel. Hutch mod can reduce/eliminate knocks (cackle).
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They are stock splits with the long lead in #8. I was also trying to fix a long crank to start by replacing injectors, ipr, icp, hpop but no luck. If i turn key off then restart right away it fires right back up but if i wait a few minutes it takes an extra second to start. Oil pressure on dash shows almost immediately.
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I replaced the tank with a plastic one (original was metal). The foot was intact and in good shape, didnt change anything there
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