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MTM38A1 Member
Joined: Dec 09, 2015 Posts: 15 Location: Great Falls, Montana
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Posted: Mon Oct 17, 2016 5:05 pm Post subject: Carter YS950 choke on 1952 M38A1 |
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I have cold starting problems. Its 50 degrees out. I have searched and read other posts. I use full choke and no throttle. The choke valve plate is fully closed by visual inspection. Will not start. I cover the carb opening with my hand, feel lots of vacuum, and the jeep immediately starts and runs great thereafter when warm. There is a one way valve in the choke plate that allows air in, which seems to be the problem. With the carb opening totally closed off with my hand, it starts. Just using the choke plate will not allow it to start.
Any suggestions |
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MTM38A1 Member
Joined: Dec 09, 2015 Posts: 15 Location: Great Falls, Montana
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Posted: Mon Oct 17, 2016 7:00 pm Post subject: |
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I've done more searching. I eliminated the oil bath air filter and replaced it with a 4 inch cone filter. I am thinking now that this has altered the air/fuel mixture and is allowing more air to get to the carb when the choke is on.
Think this is possible? |
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4x4M38 Member
Joined: May 30, 2014 Posts: 3447 Location: Texas Hill Country
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wesk Site Administrator
Joined: Apr 04, 2005 Posts: 16265 Location: Wisconsin
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Posted: Mon Oct 17, 2016 8:56 pm Post subject: |
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Quote: | I eliminated the oil bath air filter and replaced it with a 4 inch cone filter. I am thinking now that this has altered the air/fuel mixture and is allowing more air to get to the carb when the choke is on.
Think this is possible? |
I doubt it. The 4" cone type will pass just as much air as the oil bath. Think on it a bit more.
Your problem is one of two.
1 - To much air
2 - Not enough gas.
1 is going to be down stream of the choke plate. IE: Vacuum leak.
2 is going to be either low float level, clogged fuel passageway or inoperative accelerator pump. _________________ Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100
Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php |
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scoutpilot Member
Joined: Aug 31, 2015 Posts: 29 Location: Asheboro, NC
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Posted: Tue Oct 18, 2016 4:02 am Post subject: |
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Does it start any easier if you apply about half throttle with the choke closed? _________________ Old fashioned service never goes out of style. |
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oilleaker1 Member
Joined: May 14, 2009 Posts: 972 Location: South Dakota
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Posted: Tue Oct 18, 2016 4:54 am Post subject: |
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Your fuel pump may be down on supply. Check it's delivery volume to the carburator, and fuel pressure. Mine was hard starting with the choke also, and it ended up the fuel pump wasn't up to snuff. John |
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MTM38A1 Member
Joined: Dec 09, 2015 Posts: 15 Location: Great Falls, Montana
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Posted: Tue Oct 18, 2016 7:01 am Post subject: |
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scoutpilot wrote: | Does it start any easier if you apply about half throttle with the choke closed? |
No |
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MTM38A1 Member
Joined: Dec 09, 2015 Posts: 15 Location: Great Falls, Montana
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Posted: Tue Oct 18, 2016 7:02 am Post subject: |
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oilleaker1 wrote: | Your fuel pump may be down on supply. Check it's delivery volume to the carburator, and fuel pressure. Mine was hard starting with the choke also, and it ended up the fuel pump wasn't up to snuff. John |
I'll check that. I have an electric fuel pump. Thanks |
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