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Mit 4G64 Engine problem

Number of messages: 15

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anna_l
HangZhou, China

Does anyone know Mit 4G64 engine forklifts can speed up by itself ? which components wrong of the engine ? How to solve it ? Thanks for kindly help.

-------------------------
Anna

Posted 27 Aug 2008 04:57 PM

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edward_t
North Carolina, United States

model, year or serial number of the truck might help since it is much more likely to be a carburetor problem than internal to the engine.
my "instant bet, without better info...", the little screw that holds the return spring on the Carb throttle shaft has come loose.

Posted 27 Aug 2008 08:49 PM

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justinm
New York, United States

if it speeds up and slows down while youre driving then you need to adjust the governor
if its doing it at idle the governor might be broken or something could be wrong with the carb like ed said
but you need to give more info

-------------------------
New York, New York its a heluva town ..you know that The Bronx is up ..and im Brooklyn down

Posted 27 Aug 2008 10:46 PM

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Prentice
Ontario, Canada

I think you might have a problem with the throttle assembly under the carburetor. I have had them seize up, also the throttle cable can be a problem. If it's electronic throttle you need the set it by PC

Posted 28 Aug 2008 01:36 AM

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JDBurton
Virginia, United States

remove the plate on the side of the governor and check the spring in there, if worn out it can allow the engine to surge.

Posted 30 Aug 2008 03:30 AM

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edward_t
North Carolina, United States

we sure could use a lot more information here too,,, like a bit of description of "speed up by itself" (does it go wide open throttle? and stay there? is it a surge when first starting up? is it surging at wide open throttle?)
Make, model, and serial number would be a big help too, as would if it has factory or aftermarket carburetor.

Modified 1 Sep 2008 10:38 PM
by poster.

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anna_l
HangZhou, China

Guys, Thanks for your kindly help.
1. This forklift has intermittent throttle acceleration at idle - while stationary
2.After cycling Key and waiting Wrench light does not blink only stays on constant. (ENGINE NOT RUNNING)
Then Engine corp engineer suggest :
enter the display mode you

·         Turn on the key ( do not start)

·         Cycle the foot pedal 3 times to the floor within 5 seconds

·         Record flash codes (3 digit)

·         Code 12 tells you it’s the last code on the stack

·         Turn key off to exit display mode
3. we believe code # 229 . But Engine corp said they don't have this code.
4. This is what we have done to date: 1) Checking of codes, method of code removal not in manual and wasn’t spelled out.
2) Checking for vacuum leaks tightening hose clamps
3) Apply water around intake manifold which seemed to solve the hunting and telling us manifold had small leak.
4) We tightened up manifold bolts and problem seems to be gone for the time being.

Posted 1 Sep 2008 06:27 PM

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anna_l
HangZhou, China

It's electronic throttle .

Posted 1 Sep 2008 06:29 PM

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FLTdotCOdotUK
Tyne & Wear, United Kingdom

Check the governor settings, make sure the small lock wire hasn't snapped and allowed the adjuster to back off.

Posted 1 Sep 2008 10:06 PM

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FLTdotCOdotUK
Tyne & Wear, United Kingdom

Strange?

There was no replies to this when I started to write my post?

What happened there then?

Weird!??????!!

Posted 1 Sep 2008 10:08 PM

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edward_t
North Carolina, United States

(Just joking here ) FLTdotCOdotUK, that's what happens when you start a reply on Thursday, and send it on Sunday, On the internet, in "internet time".
from the description of how to get the codes, I would say it's a Clark machine, or one using the same electronic throttle controls system. and the vac leak is a good bet as to the cause.

-------------------------
webhome = forktechs.com

Modified 1 Sep 2008 10:37 PM
by poster.

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justinm
New York, United States

if shes in china theres a good chance this is a gray market machine based on the diagnostic procedure she described
the tier 1 and 2 4g64 mitsus had comp diff procedures to flash the codes
if its a 229 code then id say its a later model

we need the machines make model and serial number to narrow down your system and codes

-------------------------
New York, New York its a heluva town ..you know that The Bronx is up ..and im Brooklyn down

Modified 2 Sep 2008 02:45 AM
by poster.

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justinm
New York, United States

o and check this too
i dont know if it will apply to your truck
bolted to the crank pulley on the tier 2 4g64 mitsus they have trigger wheel (looks like a thin gear with square teeth) for the crank position sensor
if that gets off center or it wasnt installed correctly it can give you issues, youre supposed to use a spacer tool when you install it to keep it centered

then again i dont know if you have a mitsu so you still need to post make, model and serial number

-------------------------
New York, New York its a heluva town ..you know that The Bronx is up ..and im Brooklyn down

Posted 2 Sep 2008 02:49 AM

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FLTdotCOdotUK
Tyne & Wear, United Kingdom

Ed.

I started the reply and a slab of beer at the same time, wonder if that has any bearing on it!?!!

Posted 2 Sep 2008 04:06 AM

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edward_t
North Carolina, United States

I know it happens to me that way...

Posted 2 Sep 2008 05:14 AM

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