Unicarriers (& Nissan) MCP1F1A15LV:
Code E-43, runs rough at low rpm's

Swapped vaporizer, 02 sensor, main and boost injectors, mass air flow sensor, did compression check and valve adjustment, checked both LP screens in lockoff and inlet on mixer, going to swap the ECM on friday.
Any other ideas, this forklift was new in May of this year and only has 884 hours on it.
  • Posted 23 Oct 2009 07:09
  • Discussion started by darwin_t
  • Wisconsin, United States
Showing items 1 - 5 of 5 results.
Does this happen often? Not really as i have a fleet of these trucks i service. Have ran across three lifts total of hundreds i have worked on. If you suspect a breakage or intake manifold leak, check plugs and if they have white powder look then you can tell which cylinders to look for. Of the 3 i have replaced, i have found them cracked between #1 and #2 and usually the flange will be involved. My opinion it isnt a problem due to fact of huge numbers of the k-series engines i have serviced since their introduction and just 3 in my opinion doesn't call for a concern.
  • Posted 26 Dec 2013 11:12
  • Reply by RCAV8TOR
  • Alabama, United States
What i used to do all day now takes me all day to do.
I replaced the main injector, relearned the forklift and it ran great. Sorry I didn't respond sooner guys.
  • Posted 25 Dec 2013 00:47
  • Reply by darwin_t
  • Wisconsin, United States
since it was 4 years ago, my bet would be that he followed the advice of "get the dealer to fix it"...
I sure hope it is fixed by now... I doubt the dealer will warranty it now.
;-)

RCAV8TOR, have you been seeing a lot of broken intake manifolds of these motors? [either at low hours like this one, <1000 hours, or the higher hours these motors are getting into now, if so, can you describe where the breakage is happening, (so I will know to look there in the future).
thanx
  • Posted 24 Dec 2013 23:48
  • Modified 24 Dec 2013 23:54 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"
I wonder if the guy ever looked for a broken intake mani?
  • Posted 24 Dec 2013 14:31
  • Reply by RCAV8TOR
  • Alabama, United States
What i used to do all day now takes me all day to do.
I would not touch it, it is still under warranty, let the factory pay for it.
they (almost with out a doubt) need to run the idle air volume learn function, with the laptop. after that, if it still has a problem, valve adjustment and spark plugs, but they should still be under warranty also.
are you SURE your propane is HD5? (not grill gas)
  • Posted 23 Oct 2009 10:04
  • Modified 23 Oct 2009 10:21 by poster
  • Reply by edward_t
  • South Carolina, United States
"it's not rocket surgery"

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