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LPG, CNG & LNG - General Info and Issues Share experiences and problems

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ECM-4400 Stepper motor or DFCO?

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Old Jun 5th, 2024, 07:54   #1
mcfe
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Default ECM-4400 Stepper motor or DFCO?

Recently my CNG stopped working(no reaction from button). I got error code ECM-4400. I opened my stepper motor and resoldered the joints and lubricated the piston, however this did not fix the issue. It worked for 10-20 meters and shut down immediately while I was driving. But apparently there were 4 more joints in the stepper.

It's either fuel shut-off valve(DFCO?) or stepper motor is going bad elsewhere.

I would be happy if someone has ideas I can try.

Last edited by mcfe; Jun 5th, 2024 at 08:00.
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