(800) 853-2651
SHOP NOW

M runs uneven at idle

R

Rod51M

Member
Just started my M up for the first time in about 10 months after some restoration. Would never have gotten to this point without a lot of help from many of you, so I want to thank you all.

Now that I buttered you up, here is another question. At idle, it will stall or run very unevenly unless I give it a good bit of choke, even whent the engine is hot. I noticed a lot of condensation on the upper part of the carburator and it is very cold to the touch. Is that normal? Don't know if that is a clue or not? I did not have the carb apart but I don't remember this problem previously. I have to run it at about 2/3 throttle for it to run evenly without any choke.

thanks,
Rod
 

It is normal, and in cool weather with high humidity it will even form frost and sometimes even ice. What you SEE happening on the outside is also happening on the INSIDE, and that's why the engine runs rough and stunbles. There are several work-arounds and cures for it, but the best method is to just do whatever is needed to keep it running long enough for the engine to warm up, and then the problem usually will go away.
 
Open up your idle mixture screw a full turn and see if that helps. If not, that tiny idle tube might be partially plugged.
 
Thanks guys. It is running smooth now. I had to turn it in and make it richer - almost 3/4 of a turn. Idled beautifully and then I took it out on the road and ran it wide open for a bit and it still sounded good. I really appreciate the help!
 
You must log in or register to reply here.

Similar threads

D
1947 Ford 2N searching for steady rpm at Idle?
Replies
8
Views
214
Dwd14329
D
J
Farmall H - Only runs on 3/4 choke
2
Replies
21
Views
1K
JMFarmallH
J
S
M belly pump coupler question
Replies
5
Views
493
BarnyardEngineering
BarnyardEngineering
F
Won't Run Without Choke On
Replies
6
Views
4K
Sigma.40
S
D
Farmall m running rough and fule coming out the exhaust
Replies
13
Views
722
Dustyfarms
D
Tractor Parts Tractor Manuals

We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today.

Copyright © 1997-2024 Yesterday's Tractor Co.

All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.

Yesterday's Tractors - Antique Tractor Headquarters
Website Accessibility Policy

Back
Top