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Just backfires

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Grinderhead

01-11-2021 14:50:14




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My dist. cap and rotor needed replacing on my '51 8n side dist. now all I get is backfireing, what did I do!?




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Jim WI

01-13-2021 16:24:40




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Once upon a time, when I was still young and foolish I swapped the two-barrel and manifold on my '74 Chevy Nova with a Quadrajet and manifold I had gotten from the junk yard for $20. Everything went fine. I had rebuilt the Q-jet before starting. All the parts went together without any trouble.

Went to fire it up for the first time and it would fire but wouldn't run. Worked on it for about an hour before I had to borrow my mom's car to go back to my apartment for a week. I thought about it all week. When I came back home I swapped the spark plug wires and it fired right up. Yep. Wired the wrong way around.

It does happen. It's often helps to just leave it alone and think a bit. Even better is to explain the problem to someone else (in software we call it rubber ducking a problem as you can explain it to a toy duck and figure it out).

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Jim L WA

01-13-2021 16:32:49




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 Re: Just backfires in reply to Jim WI, 01-13-2021 16:24:40  
That rubber duck thing is funny. Yep, we've all done it, or have seen it done. Years ago, I was watching these guys try to get their Chevy V8 started after doing something to it. I didn't know them very well and had no credibility, but did suggest that maybe it was 180 degrees out, but they insisted that they had it right. I had to leave, but the next day I asked one of them if they got it running. Yep, he said, it was 180 degrees out of time.

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JMOR

01-12-2021 15:09:49




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Quoting Removed, click Modern View to seeLook at it this way, you fixed it in two attempts, so great....it could have taken four!



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Grinderhead

01-12-2021 14:45:02




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
I did too, still screwed it up!



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David G

01-12-2021 07:19:38




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
I change them one at a time.



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Grinderhead

01-11-2021 17:01:35




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Thank you everyone for your help! Found the problem, ME! had the wires 180 deg. off on dist. Could have sworn I put them exactly like I took them off. Next time I will Wear my Just ask Bruce shirt when I work on it.



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Bruce(VA)

01-11-2021 17:35:42




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 17:01:35  
Happens to us all at some point!

Tnx for the follow up.



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JMOR

01-11-2021 16:31:41




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Quoting Removed, click Modern View to see#1 cap tower/wire can be any one of 4 positions. simply try 4 and one will work. 4 trys or less & home run!



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Grinderhead

01-11-2021 16:30:46




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Counter clockwise



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ASEguy

01-11-2021 16:29:31




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
With all due respect, did you go clockwise or counterclockwise with the firing order on the cap?



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Grinderhead

01-11-2021 16:27:03




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Dist. has not been removed, tractor was running fine. Shouldn't the #1 wire be relatively in the same orientation to the dist. like the picture I posted. I understand firing order and #1 cylinder is at front of motor. Just trying to verify #1 plug wire position on dist. cap.



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R Geiger

01-11-2021 16:21:44




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Quoting Removed, click Modern View to see

I would say no, but bring number one cylinder up on compression stroke and see where the rotor is pointed.



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Jim.ME

01-11-2021 16:18:59




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
It is worth a try, but that is only true if the distributor was installed correctly to begin with. If that doesn't work you need to find out which terminal the rotor does point at when # 1 is on compression.

Remove # 1 Plug.

Remove the distributor cap, ground the coil wire.

Put something in #1 plug hole, like a cotton ball, not too deep.

Bump the starter gently. When the cotton ball pops out it is coming up on compression, so the rotor should be approaching the terminal where # 1 plug wire needs to be. Install # 1 wire in the cap.

Install the other wires, in the firing order, from #1 - going the same way the rotor is turning.

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btzj02

01-11-2021 15:58:59




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Please note this paragraph from shop manual. Bruce can you confirm the #1 wire is roughly pointed towards the Head bolt?



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Grinderhead

01-11-2021 15:43:08




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
the wire with the arrow is going to #1 cylinder



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Grinderhead

01-11-2021 15:31:49




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
This is #1 right?



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grizz02

01-11-2021 16:54:50




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 15:31:49  
wired in wrong direction



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Bruce(VA)

01-11-2021 15:39:13




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 15:31:49  
Firing order is 1-2-4-3, CCW.

# 1 closest to the radiator.



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Bruce(VA)

01-11-2021 15:35:26




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 15:31:49  
Who knows when we only see one end of the wire.

Did you re-connect the wires in firing order?



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Grinderhead

01-11-2021 15:00:38




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Brand new cap and rotor



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Den N Ms

01-11-2021 14:57:54




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Grinderhead,Like Bruce said,also be sure it is not wet on the inside from rain/snow ect and it does not have any carbon tracks inside of the cap.



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Grinderhead

01-11-2021 14:56:45




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Little clip is there, and checked the firing order a dozen times!



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Rogeriniowa

01-11-2021 15:04:33




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:56:45  
Do another dozen.
Take all the wires loose from the cap and do it.



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Bruce(VA)

01-11-2021 14:52:06




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 Re: Just backfires in reply to Grinderhead, 01-11-2021 14:50:14  
Check the firing order. You have it mis-wired.

And make sure the little clip is under the rotor.



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