Lly knock on cylinder 2, tried everything..

[PureHybrid]

I know its time consuming, but did you swap injectors with another cylinder?

And don't worry too much about the orings, just there to keep dirt out, they don't hold pressure.

 

[Mwaterman1]

Yeah I swapped it with the old injectors, stayed on the same cylinder, #2


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[henery97]

Have you checked the bale connectors on top of the motor. All your injector wires go through those.

 

[Mwaterman1]

Yeah I sprayed with electromotive cleaner and blew out, no noticeably messed up pins but I've run in to some generators that will not carry amperage through a pin connector this afternoon I'm going to pin out the wires and see what I can make of it, I really appreciate the help guys, this thing is plaguing me, after adjusting the valves yesterday im fairly confident now it's not mechanical, I need to string out the wires, and if everything checks out then I have to watch the injector pulse and see what it's doing


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[kidturbo]

I first replaced the injector the oring was almost completely gone, pulled the valve cover and the intake and exhaust valves were out of adjustment .008 but I can't imagine that would make the noise, haven't checked compression,

Return where you left off above.. Verify compression on that bank first. You know it's not an injector since you switched them out, correct? So leaves 2 possible causes, compression or electrical.

My money is on low compression, that +3.6 is not super high like a bad electrical miss. A blown copper you can hear easy, and if ya spray soapy water around the injector base it will change sound or blow bubbles up at ya.

I had the electromagnet ring come loose on a LLY injector, fuel knocked hard at part throttle, then went away on acceleration. My balance rate was like a +13 on that cyl.

 

[Mwaterman1]

Well I don't have a compression gauge or adapter yet so I'll check some wiring to pass the time


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[Burn Down]

I highly doubt it's low compression causing a knock, and the balance rate isn't that far off... I would swap a known good injector say 5 or 7 with 2 and see if the problem stays or switches holes.

 

[Mwaterman1]

But the thing is, I've swapped two brand new not reman injectors to that cylinder


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[Burn Down]

But the thing is, I've swapped two brand new not reman injectors to that cylinder


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Pretty sure you said used or old earlier... But that changes things. Forget swapping the injectors.

I would change the tune back to bone stock and verify the issue and recheck for codes, sometimes tuners will shut certain things off. Check the wiring for #2 from the injector to the Ficm back to the ecm.

If you have a buddy that has the same engine see if he will let you swap Ficms, ecms. If you swap the ecm be prepared to do a vats relearn, there is a tutorial on it somewhere on here.

 

[Mwaterman1]

My business partner just upgraded, if I can't figure it out I will to, by factory do you mean take out efi live?


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[Burn Down]

My business partner just upgraded, if I can't figure it out I will to, by factory do you mean take out efi live?


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yep, stock tune.

 

[Mwaterman1]

https://vimeo.com/138563806


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[henery97]

Sounds identical to mine. What are the butt connectors for??

 

[Mwaterman1]

https://vimeo.com/138566722


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[Mwaterman1]

Just quickly redid the connectors for the injector, I originally used heat shrink connectors but found when I ohmed it out high at 12 ohms through the connector


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[Mwaterman1]

Just an FYI, it was a bad intake valve, did a leak down on it and can hear it out the intake


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[Mwaterman1]

Got to troubleshoot a little more today, pulled the glow plug for #2 and took the compression kit I bought apart and rigged it up to my leak down tester, put it to top dead of #2 and put 175psi in the cylinder, measured 80% leakage, took my stethoscope and checked all over, can hear air clear as day at the y bridge, nothing in the pan or crankcase breather, is it odd this makes me happy???


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[Mwaterman1]

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[Mwaterman1]

Found the issue, wrist pin bushing, built up so much carbon valve wouldn't seat properly, what are the odds or just swapping one piston and rod?


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[bmc1025]

I've put a good used piston and rod in a lb7 before. Place a want add here.