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Crank misfire?

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12 Oct 2019 16:45 #34205 by Toddf
Crank misfire? was created by Toddf
2006 2500hd lq4 gas, gets random misfires on all cylinders, no check engine light. Has all new injectors, coils, plugs, wires. Grounds cleaned, maf sensor cleaned, vac hoses checked, new knock sensors. Suspected crank sensor issues. No access to a scope

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12 Oct 2019 18:56 #34209 by Chad
Replied by Chad on topic Crank misfire?
Do you have access to Scan Data? What do your Fuel Trims look like?

"Knowledge is a weapon. Arm yourself, well, before going to do battle."
"Understanding a question is half an answer."

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12 Oct 2019 19:23 #34210 by Toddf
Replied by Toddf on topic Crank misfire?
Yes long term was at 9 bank 2 and 6 bank 1, thought everything was pointing towards dirty injectors, replaced them and now fuel trims are about 2 long term both banks. Forgot to mention intake gasket is also new, replaced a year ago. Misfire is mostly at idle randomly on all cylinders. Thanks for the reply

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12 Oct 2019 19:25 #34211 by Toddf
Replied by Toddf on topic Crank misfire?
Scan data I have is from a actron 9185 and torque pro, nothing fancy

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12 Oct 2019 19:52 #34213 by Toddf
Replied by Toddf on topic Crank misfire?
Fuel pressure is at 60 psi, and is only about 3 months old, Delphi unit. I also done my best at a back pressure test suspected a clogged cat on bank 2 which made some noise at times in the past, reading was between 0 and 1 but needle was erratic

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