Hyster H1.60FT:
Mazda engine rough start

Mazda LPG Engine starts rough and idle goes up and down for about a minute. We thought the reason was dirty AISAN regulator so changed repair kit, fuel filter and clean LPG bottle pre-filter. But the problem stayed. Even when the engine is warm starts rough.
  • Posted 30 May 2014 08:28
  • Discussion started by luke_com
  • Silesia, Poland
Showing items 1 - 10 of 10 results.
sometimes trying to repair these is difficult to 'get it right the first time', it's generally quicker and less time involving to just get a new one or reman one if available and swap it out.
  • Posted 20 Jun 2014 03:15
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
Basically, problem with engine goes idle was solved after we cleaned carburetor. But engine still starts very bad. We found that the problem is he gets too much fuel. There is a main hose from a regulator to the carburetor. When we are taking this hose off during the engine starts we are reducing the amount of fuel and the engine starts properly. So my question is how can I reduce fuel flow. This AISAN type C regulator seems doesn't have a manual regulation. The lock-off valve seems works fine.
  • Posted 19 Jun 2014 21:46
  • Reply by luke_com
  • Silesia, Poland
Mine turned out to be the injector. Good luck with yours.
  • Posted 10 Jun 2014 11:40
  • Reply by mrbob
  • Hawaii, United States
Check your fuel shut off solenoid- I would bet it's gummed up. Installing a coolant thermostat in line with the regulator works wonders
  • Posted 7 Jun 2014 23:58
  • Reply by bbforks
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!
lukaz if you need any further help give us a serial number of the truck
also the engine series and fuel system make. Impco or Aisan?

without this info i cant help you
  • Posted 7 Jun 2014 23:57
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
I get the same code on an H60FTM. It is normally hard to start. Have to crank it for about 10 seconds before it will fire. Then it runs well. If I give it a shot of ether it will start much faster. Did you try ether? The operator tells me it just dies out sometimes but I haven't seen that happen, yet. Would help if I knew a bit more about the theory of the system.
  • Posted 7 Jun 2014 11:58
  • Modified 7 Jun 2014 12:30 by poster
  • Reply by mrbob
  • Hawaii, United States
DTC 522655-1 - Short Term Closed Loop Correction Bank 1 Greater Than NOR 40% (Lean Engine Operation)

Common problems that may cause lean codes:

- Contaminated/clogged trim fuel injector's filter and/or LPG regulator's filter
- Contaminated/clogged trim fuel injector
- Faulty trim fuel injector or wiring
- Contaminated LPG fuel
- Low primary LPG fuel pressure (for trim fuel injector)
- Low secondary LPG fuel pressure (for carburetor)
- Clogged fuel hoses
- Contaminated/dirty carburetor
- Faulty fuel shutoff solenoids
- Engine overheating
- Exhaust leaks prior to or near oxygen (O2) sensor
- Manifold vacuum leaks
- Improper ECU grounds on engine block
- Faulty ECU injector driver 2
  • Posted 7 Jun 2014 06:46
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
Thank you both for your answers. Still working on it.
Sometimes there is error code 522655-1 on te display for few seconds then disappears.
  • Posted 7 Jun 2014 06:20
  • Reply by luke_com
  • Silesia, Poland
plenty of things can cause this
edwards suggestion is certainly a problem to check

also you might want to:
look for vacuum leaks
check the ignition system
check the engine sensors
check your grounds
check the connections at the ECM

but first and foremost are there any DTC's showing up on the display?
  • Posted 30 May 2014 20:29
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
as far as the "Searching" for engine speed, you may need to pop the clips off the plastic side of the throttle body, use compressed air (and a dust-mask for you) and blow out the accumulated dust from the corners of the throttle body.
  • Posted 30 May 2014 19:57
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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