Forum: Model A (1928-31)
Today, 04:38 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Latest:
Went back and thought about what effects idle besides ignition......Vacuum leak
I checked the throttle shaft and it was slightly loose, as was the other carburetor I tried.
I bought...
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Forum: Model A (1928-31)
04-12-2024, 07:20 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
I think im going back to the fundamentals of the ignition system.
Quadruple check everything again...
May even consider a Pertronix Ignitor I.......Yes, I said it.....
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Forum: Model A (1928-31)
04-12-2024, 01:15 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
I have pinched the hose, just not on video. Did not do much...
Im certain the fan and sun reflection are causing the flashing. I tried blocking as much sun as I could, but some still got through....
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Forum: Model A (1928-31)
04-11-2024, 03:57 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
https://www.youtube.com/watch?v=0yMT04PlDo8
Second video
I did remove the side inspection cover, and I have an aluminum timing gear, with all teeth intact and crisp, no wear etc
Removed the...
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Forum: Model A (1928-31)
04-11-2024, 10:13 AM
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Replies: 136
Views: 9,149
Re: Misfire mystery
I also used my thermal gun on the cylinders and exhaust manifold etc.
All appeared to be pretty even in temperature.
Used my screwdriver stethoscope and couldn't really hear anything unusual.
...
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Forum: Model A (1928-31)
04-11-2024, 09:34 AM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Hey Rob, thanks for the all the hard work...
I will get more video today.
If you can think of any other angles, let me know.
I do have a different distributor cap on it now, the more...
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Forum: Model A (1928-31)
04-11-2024, 08:06 AM
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Replies: 136
Views: 9,149
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Forum: Model A (1928-31)
04-10-2024, 09:49 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Thanks Benson
I did check the engine running at night and saw no sparks escaping.
My dad has a 31 Roadster, starts up cold and goes into a very nice idle, no misfire etc. Now, his is 12 volt...
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Forum: Model A (1928-31)
04-10-2024, 08:51 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Thanks for spotting that....
I ran the engine tonight in the dark and did not see any sparks or fireworks at the plugs etc.
Anyone think the timing gear could be a tooth off and still run ok?
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Forum: Model A (1928-31)
04-10-2024, 06:44 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Thanks everyone for the responses....
I have tried two different distributors, one has the new style points/condenser, the other has the original style...no change
Could be the nature of the...
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Forum: Model A (1928-31)
04-10-2024, 08:48 AM
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Replies: 136
Views: 9,149
Re: Misfire mystery
My thought was with the damaged ignition cable, I had a weak spark and the unburnt fuel was the result.
I still believe its an ignition issue, but sometimes it helps with other opinions, as I get...
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Forum: Model A (1928-31)
04-10-2024, 08:42 AM
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Replies: 136
Views: 9,149
Re: Misfire mystery
All new valves and springs
Yes, Idle is a little high, I need to get another video, but it does the same thing at slower idle. The puff is more pronounced in person than on the video.
My...
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Forum: Model A (1928-31)
04-09-2024, 11:48 PM
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Replies: 136
Views: 9,149
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Forum: Model A (1928-31)
04-09-2024, 11:03 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
https://www.youtube.com/shorts/RxZxK0TB8SY
This is not my car, but mine sounds similar to this..
You have to turn it up to hear the puffing
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Forum: Model A (1928-31)
04-09-2024, 06:54 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Today's shenanigans ........
While waiting on the new cable, I decided to try and salvage the old one. I cut off the affected area (what I could see) and spliced new 14 gauge wire in place.
No...
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Forum: Model A (1928-31)
04-09-2024, 03:41 PM
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Replies: 24
Views: 1,050
Re: A newbie needs help!
VIN will be on the engine block near the water pump inlet. On drivers side of block.
The other VIN is on the frame and I believe you have to raise the body up to see it. On my title (Texas), it...
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Forum: Model A (1928-31)
04-08-2024, 04:36 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
I have the NuRex ignition switch that looks like the pop out. I also have the small cable that unscrews from the distributor without removing it.
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Forum: Model A (1928-31)
04-08-2024, 09:07 AM
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Replies: 136
Views: 9,149
Re: Misfire mystery
You are correct, what I have seen on vendors sites is a roadside cable. It has the screw in end and then on the other end an alligator clip to clip to the positive side of the coil (positive ground...
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Forum: Model A (1928-31)
04-07-2024, 07:45 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
First picture is the armor unwrapped to show the black cloth then white plastic insulation
Second picture is the "burned area" I found after removing the cable
Third is the armor unwrapped at...
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Forum: Model A (1928-31)
04-07-2024, 07:43 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
https://www.fordbarn.com/forum/attachment.php?attachmentid=540095&stc=1&d=1712536977
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Forum: Model A (1928-31)
04-07-2024, 07:33 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Here's today's find......
The only component of the ignition system I had not replaced was the small armored cable from the ignition switch to the condenser.
I had 6.4 volts at the ignition...
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Forum: Model A (1928-31)
04-06-2024, 08:02 AM
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Replies: 136
Views: 9,149
Re: Misfire mystery
I had the head off and cleaned the pistons etc of carbon.
My friend has an oscilloscope which Im going to attempt to use.
I also was going to try an epoxy filled coil in place of the oil filled...
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Forum: Model A (1928-31)
04-05-2024, 11:09 AM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Rob, I agree with what you are saying, and that is something I have not done.
I was giving the benefit of the doubt to the new wiring, etc.
As random as it is, it seems a weak spark or ignition...
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Forum: Model A (1928-31)
04-04-2024, 08:16 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Received the Renners jet kit and rebuilt a third carburetor. No change in the misfire.
The carburetor is more sensitive to adjustment now with the Renner's jets.
Tried closing the spark plug...
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Forum: Model A (1928-31)
03-31-2024, 07:19 PM
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Replies: 136
Views: 9,149
Re: Misfire mystery
Yeah, thats what Im trying to get......Im going to talk with Renners tomorrow.
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