Hello everybody, I have a combilift on my hands that has a gm 3.0l lpg powered engine in it. It is electronically controlled (crank, tps etc). I know hysters use these engines as well and the combilift section here wasn t any help. Recently we have replaced the throttle cable, dist cap, rotor, wire set, spark plugs, ignition module, coil, and crank sensor. The unit idles fine and throttle works fine when the unit is stationary but while driving the throttle feels like its sometimes limited to 50% and then the forklift stalls. It always restarts fine. Its getting expensive throwing parts at it. Right now I am leaning towards the TPS but I have never seen these cause stalling. Any ideas and or literature would be greatly appreciated. I have manuals and wiring diagrams for the older 3.0l's but nothing for these newer ones. I hope one of you Hyster techs can help me. Any literature can be sent to me at loewen12 at Hotmail dot com. Thanks in advance.
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you don't say if this is LPG or gasoline, if Gas, check the fuel filter and fuel lines for cracking on the side before the pump (suction side for leaking air into the line when vibration gets strong, air being able to leak in, when no fuel leaks out.)
I would also consider the temp sender circuit. if the engine is getting too hot or thinks it is too hot, a speed/engine rpm de-rate then shut down would be expected and normal to protect the engine.
on a combilift if the engine runs good standing still but when you try and drive it you get the stalling then you may have a hydraulic circuit malfunctioning causing it to stall the engine out.
I would start looking at the valves and solenoid controls associated with the drive circuit. Especially if it is not throwing an engine code when this happens.
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