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DISCUSSION FORUMS : Forkliftaction.communicate
Forum: Mechanical Troubleshooting
Brand: Komatsu - Model: FG45T-6
Number of messages: 8

START MESSAGE:
green
Iowa, United States
I have a Komatsu with a Nissan dual fuel lp/g inline 6 cylinder. It runs great on LP but when on gas it chokes when trying to accelerate. Once the rpms are high it runs fine. When idling, chokes every time when you stomp on the pedal. I took the carb off and cleaned, the accelerator pump seems to be working fine. What next?

Posted 25 Mar 2011 08:03 AM Reply  Report this message
REPLIES: Sort replies by
mrfixit
New York, United States
I would guess the carburetor pilot circuit and/or accelerator pump still has problems.

Posted 25 Mar 2011 09:36 PM Reply  Report this message
green
Iowa, United States
I know for fact the accelerator pump is working, can see the fuel being shot into the carb after I cleaned it. I am not real great with carbs, thought I had everything real clean. Not sure I know what the pilot circuit is. Runs great wide open once I get the RPM's worked up. Do I have to pull the carb back off to know if the pilot circuit is working? Any other suggestions?

Posted 26 Mar 2011 04:20 AM Reply  Report this message
edward_t
South Carolina, United States

set timing? checked to see the vac advance in distrib is working and connected properly?

Until computer controlled engine timing* came along to forklifts, most forklift mechanics "in the know" considered "dual fuel" to be a cruel joke on forklift mechanics, since we knew that in order to get a conversion from LPG to Gasoline (or the other way around) to run correctly required a change in the ignition timing by about 5 degrees, and we usually "split the difference" with a slight advantage to whatever fuel system was most likely to be used.
if your truck is "pre-emissions controls" be sure that you run all the fuel out of 1 system before you try the other system, or you may have too much fuel in the combustion chamber, which can sometimes cause symptoms somewhat like you describe.  
*Computer controlled emission dual fuel trucks have 2 sets of computerized settings, 1 for LPG and 1 for gasoline, so the dual fuel actually works correctly, but the computer learning process requires 2 sets of "learn", 1 for each fuel source.  

-------------------------
"it's not rocket surgery"
webhome=forktechs.com


Modified 27 Mar 2011 10:54 PM
by poster.
Reply  Report this message
green
Iowa, United States
I was wondering about the vac advance. What is the best way to check if it is working properly?

Posted 28 Mar 2011 11:17 PM Reply  Report this message
green
Iowa, United States
I have also noticed that the problem is not as bad when it gets warmed up.

Posted 28 Mar 2011 11:18 PM Reply  Report this message
edward_t
South Carolina, United States

my first choice would be to hook up a timing light with the vac line on the distrib to see it  advance as you accelerate, next choice is to take distributor cap off, if vac operated, draw a vac on the line to see the plate move.
have you cleaned/drained the "honey" from the regulator?

-------------------------
"it's not rocket surgery"
webhome=forktechs.com


Modified 29 Mar 2011 06:02 AM
by poster.
Reply  Report this message
green
Iowa, United States
I have not done anything with the regulator. It runs fine on LP so I did nothing with that side of it. I will try checking the distributor this week and let you know.

Posted 29 Mar 2011 06:52 AM Reply  Report this message

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