| Author |
Message |
    
Maurice B. Trosclair
Member
Username: Mtrosclair
LA
Registered: 5-2010
Post Number: 47
| | Posted on Wednesday, July 28, 2010 - 12:20 pm: | 
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JD 322 idles great when cool but after running (like cutting the lawn) it will not drop down to idle without dying. I checked the choke and it seems to be working correctly. As it is dying it seems like the rpms go up and down like the engine is trying to find a range in can run at. sometimes it misses right before stopping. Runs great at full power though. Maurice |
Maurice B. Trosclair
Member
Username: Mtrosclair
LA
Registered: 5-2010
Post Number: 48
| | Posted on Thursday, July 29, 2010 - 8:46 am: |
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Any suggestions? |
AJ Cannon
Member
Username: Ajcan
Ga
Registered: 1-2004
Post Number: 2141
| | Posted on Thursday, July 29, 2010 - 9:24 am: |
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Maurice
I do not have a lot to offer but I hate for someone to be left hanging with no help offered.
If you have the automatic choke I would start with checking the coolant level.
When it is searching for an idle speed it may be low on coolant and it is trying to figure out if it is at operating temperature or not.
My guess is like a car,a temperature sensor tells the choke if it is at normal temperature to turn off the choke.
If you are low on coolant the temperature sensor will not read and it can't decide to turn the choke on or not.
If it can't decide it may be turning on the choke therefor stalling it out when warm.
Let me know how it turns out and I will take a look at the etm for the idle circuit.
Of course if it is manual choke then I typed a lot for nothing.
Let me know.
AJ |
Chuck Van Dusen
Member
Username: Chuckv
OR
Registered: 1-2007
Post Number: 3837
| | Posted on Thursday, July 29, 2010 - 11:53 am: |
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Maurice,
Low speed 'hunting' is often the sign of either a partially blocked low speed jet (too little fuel) or a manifold or gasket air leak (too much air...) At open throttle operation the volume of air flow is large compared to a leak, and the fuel comes into the carburetor from both the low speed AND high speed jets, so the mixture is richer.
Start by cleaning the carburetor and inspecting for signs of sediment in the float bowl which might point to a blocked low speed jet. I presume that you have changed the fuel filter already, but you may have to replace the fuel lines of they are old enough to be shedding contamination into the gas.
The electric choke is pretty simple on these tractors and does not sense the operating temperature of the engine. It is just a bi-metal strip that unwinds when heated electrically and moves the choke plate to open over a short time delay of a minute or two...
Chuck |
Dale Mitchell
Member
Username: Deere_322
Minnesota
Registered: 7-2009
Post Number: 3
| | Posted on Thursday, July 29, 2010 - 12:04 pm: |
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Try holding the choke open with your finger when you go to idle and if it still happens the Governor may not be working correctly or you may have a vacuum leak.
If its a vacuum leak you should be able to use the choke to keep it running.
Dale |
AJ Cannon
Member
Username: Ajcan
Ga
Registered: 1-2004
Post Number: 2143
| | Posted on Thursday, July 29, 2010 - 12:28 pm: |
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Well there you go Maurice.
All it took was me giving you some bad advise to get you some help.
AJ |
Maurice B. Trosclair
Member
Username: Mtrosclair
LA
Registered: 5-2010
Post Number: 49
| | Posted on Thursday, July 29, 2010 - 8:36 pm: |
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Thanks all for the advice, I'll be trying some of those tomorrow. I really need to get the repair manual for this thing. Does the governor affect low speed operations or does it just protect from over rev situations? I do have the electric choke btw. Thanks |
Chuck Van Dusen
Member
Username: Chuckv
OR
Registered: 1-2007
Post Number: 3838
| | Posted on Thursday, July 29, 2010 - 10:53 pm: |
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Maurice,
I sent you some excerpted information on your tractor that should help get you started finding the root cause of your symptom and getting it resolved...
Chuck |
Jim Wiggins
Member
Username: Lt4jim
Tx
Registered: 6-2003
Post Number: 122
| | Posted on Thursday, July 29, 2010 - 11:01 pm: |
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I had a similar problem happen twice since I've owned my 322. In both cases the problem was an ignition coil that only acted up when hot. I isolated the problem by pulling the spark plug wires individually to see which cylinder was acting up. When that was determined, I swapped coils between cylinders to verify the problem moved.
The major difference in the symptoms is that I could tell that mine would miss at full throttle and not hunt. So, I would tend to think it's a fuel / vacuum issue as others have pointed out. I only mentioned my symptoms and fix in case it's not that.
Hope this helps,
Jim |
Maurice B. Trosclair
Member
Username: Mtrosclair
LA
Registered: 5-2010
Post Number: 50
| | Posted on Friday, July 30, 2010 - 8:46 am: |
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Chuck,
That Is fantastic information, Thank you very much! I can take it apart now! |
Bob Lindell
Member
Username: Boblin
CO
Registered: 4-2008
Post Number: 53
| | Posted on Friday, July 30, 2010 - 4:04 pm: |
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Maurice,
It might me as simple as just richen your idle mixture screw a little. I had the same problem after soaking my carb and rebuilding it. When setting the mixture screw I was a little lean. Adjust it about 1/8 turn and try again. It took about a 1/4 total to fix my problem. I think I am just a little over 1.5 turns out now.
Bob |
Todd Hawes
Member
Username: Mechanos
MO
Registered: 10-2009
Post Number: 136
| | Posted on Friday, July 30, 2010 - 7:57 pm: |
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Start simple.... does it smell rich before it dies? Did you check the air filter? |
Maurice B. Trosclair
Member
Username: Mtrosclair
LA
Registered: 5-2010
Post Number: 51
| | Posted on Saturday, July 31, 2010 - 10:06 am: |
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Took the carb apart and cleaned it really well, I runs like a champ now. There must have been something in one of the jets. Todd, I had not noticed a rich smell, the air filter looks ok. What is the procedure for setting the mixture in these? |
