I have the famous E-27 code on a 2006 Nissan 30 forklift, MCPL01A15LV. Running Propane/LP. This lift has 600 hours. It doesn't get used much. Only to unload a truck maybe once or twice a week. It only runs for 5-10 mins most of the time. I've done a full tune up, new spark plugs, filters, fluids, etc. I replaced both crank and cam sensors. I did the pedal dance as directed above. This cleared the code and the fork lift ran decent for about 5 hours. On cold startup its idles up and down a bit but after its warmed up it runs fine, seems the throttle response is a bit sluggish to me though.

I've checked the coils and they are all working fine. It will only run on 2 cylinders. I did notice the plugs look a little browner in the 2 inner cylinders when i replaced them.

I'm starting to believe this E-27 code is a fuel issue. Can anybody chime in here please? I question if the regulator is gummed up or maybe the vaporizer? P.S i'm not a forklift tech. Just a mechanic trying to learn more about propane.