Good Day All:
Have a Toyota forklift under above mentioned model, It is a Dual fuel system and Runs Mostly on LPG, we use gas in the winter when it is to cold for LPG.
My issue is that this machine is very hard to start under LPG, when running on Gas it fires in an instant, where as LPG takes up to a minute of cranking to get it to fire. I did the basics, Checked Ignition System and Plugs, Cap and Rotor have all been replaced, did a spark test on the machine and found that the spark under cranking load is significantly weaker when key is turned to crank, once running spark is much stronger. Battery has been replaced so low voltage is not an issue. Checked voltage and battery drops to 9.0 Volts under cranking load when spark is weak. Checked wires going to coil and all is good. Is there a "Tolerance" or a resistance factor to see if the coil is getting weak? I also found that the coil is loose in it's mount and vibration over time may have affected it's performance. I just want to make sure the coil is weak before spending $$$ on a new coil, just to find out that is not the problem.

Thanks