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JSS1439's avatar
JSS1439
Explorer
Jul 29, 2014

Cummins Onan Generator running ruff at start up

Hi all, I have a Cummins Onan 5500 generator model HGJAB Spec E that on start up runs very ruff and smokes like crazy. It will stall out and give a 37 code about 3-4 times before eventually smoothing ...
nuggetthunter's avatar
nuggetthunter
Explorer
Jul 30, 2014
I have the exact unit in my toy hauler that was doing the same thing. You are on the right path with the choke pull off. Check to see if it will hold a vacuum. May have to remove the pull off to get the vacuum line off to check. If it does not hold vacuum replace the choke pull off assembly. It corrected mine and it now runs like a champ.

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