Bucking T

jchochole

jchochole

Senior Member
Hey Guys,
Got the T on the road today, low gear was great but she bucked and lurched and wouldn't go into high gear? What do folks think? Clutch needs tightening?

Thanks,
Jim from IL
 
Pedal does not stick and I have only had the car for a few months. Ran well and didn't buck until I dropped some MM Oil in the trans. I have since drained it out and put 30W in the case. But she still bucks.

Thanks,
Jim from IL
 
Yes, I have a rebuilt carb and also did the normal adjustments and it doasn't seem to be a gas issue.

Thanks,
Jim from IL
 
Jchochole, If you dont think it is drive-train related, then you might also look at where the intake goes into the block an ck for a vacume leak. The gland rings in that location may have corrided away. With it idlein spray some wd-40 in the seams and see if the engine changes speed or sound. A sure find to a leak there. Monte
 
I had a local Model T mechanic stop over and he concluded it was a coil issue, it was misfiring in high gear.

Thanks,
Jim from IL
 
Glad you found it. I had two weak coils and once replaced, it purrs like a Kitten. Also, you may want to chnge the plugs, as with a weak coil, they may be a bit fouled.
 
jchochole said:
I am now heading to Ron the coilman.

Jim from IL
Click to expand...

This is an old post and I’m sorry for hashing it over again. I bought my ‘26 Runabout 4 years ago and it has this similar issue. I replaced the coils with newly rebuilt ones from Langs. Since then I still have this issue. I doubt I’ve even put 20 miles on the car. Is it possible that one of the coils is defective? Already? The problem never has cleared up. How can I test the coils at home? Did new coils fix this for you?
 
The coils are the ******** type so they can be tested by rotating the engine to get the timer on each pole terminal and using a spark plug that is grounded to check spark. That only checks them under no load conditions though so it's not a complete test.

When I load check spark plugs, the plug tester that I use has a chamber to screw the plug into and apply 120 psi of compressed air during the test. The spark can be seen through a little window in the chamber and a small mirror reflects it visually so the operator can see the spark. I don't think the testers were set up for an antique plug that has a 1/2" NPT pipe thread like the model Ts had.

The trembler coils have the capacitor, or condenser if you will, built into the internal circuit. If the capacitor goes bad then the ignition may not function well under load so a load test is important. The other way to test a coil is with the ECCT or electronically cranked coil tester. These will check the full function including the capacitor. The unit helps to adjust the output as well so it's a good tool to have for model Ts. This is a link for them. https://modeltecct.com/ If you don't want to pay the high price then look for someone local to you that has one. A lot of model T clubs have one or have a member who does. Clubs are invaluable for this type of stuff.
 
Have you cleaned your timer and checked the timing? Check the wiring from the coilbox also. As mentioned in the original post check for manifold vacuum leaks.
 
ratmother said:
Have you cleaned your timer and checked the timing? Check the wiring from the coilbox also. As mentioned in the original post check for manifold vacuum leaks.
Click to expand...

I have checked those things before and the timer is new with very little miles on it. I’ll check those again.
 
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