Engine miss

[Rawze]

(02-07-2023 )Gapvalley Wrote:  Working on a 2015 Cummins cm2350 driver came in with a miss. Connected insite to truck found a active code 4726 engine fuel leakage not sure if this is my main issue or not. Cutout cylinders found cylinders 1,3,5 are missing. 2,5,6 make the engine change rpm. Pulled the valve cover off and started engine intake and exhaust valve are all moving and Jake rockers are not moving. Next step my be run a valve adjustment if there all within spec maybe ecm. Looking for any input

that is a fuel leak code.

will it pass an injector leak test?.. what was the leak rate in one minute.. when done exactly like this video shows...

<iframe id="odysee-iframe" width="560" height="315" src="https://odysee.com/$/embed/isx-injector-leak-test-for-the-cm2250/e8187fb8d70f0f06388b597cb40751c5536d03dd?r=8p8MjqctPT8PafuYA5mftGueGF8L3how" allowfullscreen></iframe>
https://odysee.com/@rawze:d/isx-injector...e-cm2250:e

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If it will not pass a fuel leak test (done exactly like the video shows), then that is the place to start with it. Maybe the pressure relief valve at the end of the fuel rail (most common).. or a leaky injector. If it is an injector, then a cummins injector block-off kit needs to be used to isolate and find it.


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