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Odd knock

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Old Apr 6, 2018 | 01:06 PM
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Odd knock

Hey Guys I have a 95 f250. It knocks loud some times, then not so loud, and sometimes it goes away. When I pulled the injectors I found the o-rings were chewed up. bingo I got a new set of remans injectors from riff raff it.
It still knocks, but the injectors seemed to help. I still have good power. I'm wondering if the valve train can make a knock, or open to other Ideas. Truck is a manual with solid flywheel, with 313,000mi on it
 
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Old Apr 6, 2018 | 01:13 PM
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From: Bahstun
what is fuel pressure at idle and WOT in 3rd?

What did you torque them too?



I did mine hot since one came loose after orings.

Also a manifold leak can sound like a knock
 
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Old Apr 6, 2018 | 11:11 PM
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I'll check the fuel pressure but I don't think that is it I still have good power, It knocked right at start up, so I doubt a bolt is loose.
 
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Old Apr 7, 2018 | 02:13 PM
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Well Fuel pressure might be the right track. 30psi at an idle and it doesn't take much throttle to put it over 100psi. it blew my hose apart on my gauge.
 
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Old Apr 7, 2018 | 11:48 PM
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You should never see 100 psi. That's too high.
 
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Old Apr 8, 2018 | 05:10 PM
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I took apart the pressure regulator and I had pieces of the old injector O-rings in it. Now it is at 65psi. It ticks instead of nocks now.
 
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Old Apr 8, 2018 | 05:50 PM
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That seems like it helped quite a bit. Does the tick seem abnormal or just part of the PSD normal running
 
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Old Apr 8, 2018 | 07:24 PM
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When its softly ticking it blends in with the motor well, when its loud it's very noticeable. I think my next step is to pull my valve cover and check my rockers.
 
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