Yale GLCO50VX:
starts to miss when warm no code

It's the one with the impco regulator.
after you drive it for awhile the engine starts to miss and break down.
No code given.
Fuel filter is not freezing up.
Plugs have been changed.
Tried draining the reg, nothing in there
Fuel pressure is 2.5 psi while running. Not sure what it's supposed to be. We have the books on this but together they are a foot thick and the fuel pressure was not in the fuel section.
Any ideas please.
  • Posted 11 Jun 2012 20:08
  • Discussion started by dozer
  • Ontario, Canada
When in doubt replace the operator
Showing items 1 - 6 of 6 results.
I never got back to this, had to go to other customers.
But the tech that did found a bad wire/connection (not spark plug wire) at the coils.
Thanks for the help, it led us in the right direction.
  • Posted 21 Jun 2012 19:45
  • Reply by dozer
  • Ontario, Canada
When in doubt replace the operator
Thanks guys.
I didn't get back to this today.
I'll let you know what happens.
  • Posted 12 Jun 2012 11:52
  • Reply by dozer
  • Ontario, Canada
When in doubt replace the operator
Is this a newer truck with 4 ignition coils? If so, the wires break right at the plug that goes into each coil.
  • Posted 12 Jun 2012 11:42
  • Reply by mrfixit
  • New York, United States
Sounds to me like the coil is breaking down when it gets warm/hot
  • Posted 12 Jun 2012 08:27
  • Reply by kevin_t
  • Pennsylvania, United States
swoop223 has a good point- use good (not aftermarket) igniton wires & spark plugs ( I have good luck with A/C or Autolite plugs & NAPA make your own wires) The SMH stuff never seems to hold up.

If the ignition checks out, I'd then check the fuel system. Does the engine only run rough at idle? When was the last time the Impco regulator was changed? Is it a model J? What type of propane shut off valve does it have- vacuum VFF-30?

I have found that usually when the impco systems go bad they either are hard to start & won't accelerate when cold ( buildup of tar) or they begin to run rich when warm (primary port of regulator starts to leak) or VFF-30 vacuum line starts to feed engine LPG.

To check the VFF-30- pull the vacuum line & cover the vacuum port. Engine should run a few minutes before stalling- listen to engine to see if engine smooths out. If engine runs same reattach vacuum lline, start engine & shut off propane bottle. Listen to see if engine smooths out right before it stalls. If it does the regulator is bad.

Hope this helps
  • Posted 12 Jun 2012 08:08
  • Reply by bbforks
  • Pennsylvania, United States
bbforks (at) Hotmail (dot) com
Customers love technology- until they have to pay to fix it!
a couple of things come to mind
- you did use factory plugs not aftermarket ones right?
- have you checked the plug wires, make sure they aren't breaking down when they get hot. (usually they would start arcing against the engine head or anywhere they are close to the engine).

As for the fuel pressure? that sounds close to what it supposed to be, maybe slightly low. what is it doing when you accelerate? does it drop lower? or is it consistant?
if it drops then this could be the problem...
vaporizer/converter

good luck
  • Posted 11 Jun 2012 23:24
  • Reply by swoop223
  • North Carolina, United States
You've been swooped!
swoop223@gmail.com

Having trouble using the Discussion Forums? Contact us for help.

Forkliftaction.com accepts no responsibility for forum content and requires forum participants to adhere to the rules. Click here for more information.

FOR SALE ON MACHINERY-ONQ

Raymond 112TM-FRE60L
Canada Ontario
Australia Victoria
United States Pennsylvania
Australia Victoria

In the Virtual Expo

NSS16-20N2(I) sit-on stackers from Cat® Lift Trucks
These flexible sit-on pallet stackers are ergonomically designed for intensive stacking and internal transport, long distances and shifts, and stacking up to 7.0 metres.
Packaging Innovations & Empack, Featuring Contract Pack & Fulfilment, will be held at the NEC Birmingham on 15 & 16 February, 2023, and is free for attendees.
Rebo Systems has developed a unique in-house label printer that can effectively satisfy all your demands for signs and labels on your materials handling equipment.

Next Editorial Features

SMART ATTACHMENTS - Mar 2023
DRIVERLESS/AUTOMATED MATERIALS HANDLING - Apr 2023
IWLEX is a brand-new purpose driven, industry exhibition, conference and community specifically focusing on warehousing and intralogistics, and will be held at the Telford International Centre, Shropshire, England on the 23-24 May 2023.
Packaging Innovations & Empack, Featuring Contract Pack & Fulfilment, will be held at the NEC Birmingham on 15 & 16 February, 2023, and is free for attendees.

Next Editorial Features

SMART ATTACHMENTS - Mar 2023
DRIVERLESS/AUTOMATED MATERIALS HANDLING - Apr 2023