Toyota 7FGU45:
Hard Start

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
  • Posted 24 Apr 2014 22:20
  • Discussion started by Wyrm
  • Manitoba, Canada
Showing items 1 - 3 of 3 results.
I have a 2002 Mitsubishi fg25k that I currently changed the head gasket on. after doing so I set my timing fired up the lift and it back fired through the intake. after trying to set my timing on the fork truck again the timing belt snapped so now I have replaced that. But after changing the belt I can not get the thing to fire its almost like its not getting propane. Any Suggestions.
  • Posted 10 Nov 2015 00:01
  • Reply by CraZMaintenance
  • New York, United States
Just on a side note, Could LPG mixture be a cause? Running to Lean? Does not backfire or smell of un-burnt LPG, Power and response is all good when running on LPG, if you re-start after about 10 minutes of sitting it starts hard, but fires quicker the less time it cools. If you "Pump" it, The un-burnt LPG builds and you can start to smell it, and it will backfire. I am starting to risk blowing the muffler apart.

Thank you for the troubleshooting advice, I will do what you listed and post the results.

Thanks Again.
  • Posted 25 Apr 2014 01:03
  • Reply by Wyrm
  • Manitoba, Canada
I've found wiring to be an issue with newer Toyota's. I'd install a jumper to the hot side of the coil while cranking & check spark then. If spark looks better there's a wiring issue that's causing most of the battery power to go to the starter, draining the power source for the coil.

To further test this, install a jumper between the starter solenoid (the start spade on the solenoid) & the battery & test ignition spark again. It should again be strong & bright.

If you find these 2 test bring the cranking spark up, install an external solenoid in-line with the feed wire to the starter solenoid so the new solenoid connects the start spade of the starter solenoid to the positive stud of the battery, with the existing wiring feeding the starter solenoid feeding the new aux solenoid.

And- you are correct that starting on LP requires a stronger spark then starting on gasoline. With that said- you should be able to start on LP no matter the temp- all of the units I service are strictly LP & all are operated year round- most are operated outdoors and are in unheated situations.
  • Posted 25 Apr 2014 00:25
  • Modified 25 Apr 2014 00:29 by poster
  • Reply by bbforks
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
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