Need help deciphering live data file
Lead Driver
Joined: Oct 2005
Posts: 6,129
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From: Ponca City, OK
It's actually nowhere near as bad as it sounds. It's easy to check, easy to fix, oh and the part/s are cheap. Like I said before it's far from unheard of on these engines and it can be as simple as replacing the offending part and go on with the rest of your life.
Got Data?
Joined: Dec 2012
Posts: 4,261
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From: Lake Stevens, WA
What does a bent pushrod do on a diesel? Does the intake or exhaust valve not open as far, and result in less air in/less exhaust out? With fuel injected, the same fuel is going in.
Would there be some smoke from this cylinder due to more fuel to air (intake side) or more fuel to exhaust gases/less oxygen (exhaust side), resulting in an incomplete burn and less power from the cylinder?
There would still be good compression because the valves would still fully close, right?
Would there be some smoke from this cylinder due to more fuel to air (intake side) or more fuel to exhaust gases/less oxygen (exhaust side), resulting in an incomplete burn and less power from the cylinder?
There would still be good compression because the valves would still fully close, right?
Got Data?
Joined: Dec 2012
Posts: 4,261
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From: Lake Stevens, WA
This #5 CCT failure and PERDEL confirmation seems to suggest this cylinder is the cause. But what is the root cause of the cylinder not contributing on time, relative to the other cylinders? That can have a few causes, but you've eliminated many.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Basically the valve or valves being affected by a bent pushrod would open late, open less, and close earlier than the PCM expects them too. Depending on whether it's an intake or exhaust it would mean less air making it into a cylinder or restricting combustion glasses escaping after the power stroke.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,354
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From: Lake Hartwell, GA
Basically the valve or valves being affected by a bent pushrod would oper late, open less, and close earlier than the PCM expects them too. Depending on whether it's an intake or exhaust it would mean less air making it into a cylinder or restricting combustion glasses escaping after the power stroke.
I recall Tristan ( @Hyakkimaru ) recently had a bent pushrod and replaced it, but I don't recall his symptoms.
Logistics Pro
Joined: Jan 2021
Posts: 4,077
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From: Fairhope Alabama
I had thumping out the intake and found a broken in half pushrod. The only real sign I had was loud thumping. Was easy enough to find the broken pushrod by how loose the rocker was. When I took the rocker off and lifted it, half a push rod came out with it lol. I retrieved the other half with an extendable magnet stick. Now I have Smith Brothers push rods in the engine that I just put in my truck not long ago. No more RPM problems 
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