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testing for miss-fire with electronic ignition

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a_lead

02-14-2008 17:54:45




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Up-dated the ignition on my 340 to the Pertronix from this site. Still 6V Pos Gnd.

Opened up the plug gap to .040", put on a new cap & rotor, also new coil. Ran great.

Was out pushing the snow/sleet/freezing rain that we had in Md on Tuesday, tractor started to miss and back-fire, and then stopped running. Made sure it had gas, and noticed a hunk of rust in the tank sitting on the hole to the bowl. Was able to clear the rust for un-obstructed flow.

Restarted and ran okay a little bit longer then started to miss again and back-fired so hard that it blew the muffler apart on the seam, then stopped again and I haven't been able to get started again.
Motor was completely over-hauled in 1996, probably no more than 500 hrs. since.
Took the plug out of the bottom of the carb, and I think I have good gas flow.
It seems as if it has jumped timing. Short of putting the old breaker points back in, is there any other way to check for correct timing with the motor not running.

Thanks in advance for your help. Sorry for the long post.

Edward

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Hugh MacKay

02-15-2008 07:57:47




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 Re: Call on Nowlans Gator in reply to a_lead, 02-14-2008 17:54:45  
Edward: Call on NG, he's been trying to convince me these devices are trouble free. You see, I haven't been terribly convinced since my new 1979 Olds 98 Regency quit on my wife, less than 20,000 miles on the odometer.

Required a whole new electronic ign unit, yes GM warrenty covered it, but I didn't see them waving cash around for our time wasted. This Olds, being my 4th car lifetime was rather annoying, being the 7th motor vehicle for me lifetime, and I had paid as much for it as any 3 of the previous 6. Prior to that I had probably clocked up 3/4 million miles on 3 pre 1975 cars and 3 pre 1975 pickups, and this Olds was my first highway let down.

I have a friend, a dairy farmer back in Nova Scotia. He's 75 years old, claims being 75 is a good point considering the progress we've seen lifetime. Not sure how much more of this progress I can hack either.

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Janicholson

02-15-2008 07:50:24




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-14-2008 17:54:45  
What has not ben mentioned is condensation in the cap. Hot ignition will and has caused internal "redistribution" of spark. Dry it with a blow dryer, and apply silicone spray. Cheap possible fix. JimN



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Red460

02-15-2008 07:18:34




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-14-2008 17:54:45  
I tend to think you still have fuel problems. Carb is starved for gas running lean and backfiring. Dirt in line or carb.



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NawlensGator

02-15-2008 07:17:52




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-14-2008 17:54:45  

I opened my plug gaps from 0.023 to 0.044, but only after I changed to the petronix flame thrower coil. That was on a 140.

When I did the same to the cub, it started hitting on only No. 2 & 3 cylinders. Upon inspection I found the plug wires at the distributer end had burned out (where they terminate in the cap). New plug wires solved the problem.



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a_lead

02-15-2008 08:22:15




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 Re: testing for miss-fire with electronic ignition in reply to NawlensGator, 02-15-2008 07:17:52  
I will have to take a look at the wires also. They have been on for several years; maybe since the over-haul.

For Allen: I also changed the coil to the Pertronix unit from this site also.

Will keep you"ll posted to what I find this weekend when I have time to get into it.

Thanks. Edward



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a_lead

02-15-2008 02:17:46




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-14-2008 17:54:45  
Guess I had my head where the sun doesn"t shine with changing the plug gap. Will have to re-set this evening after work and wee what happens.

Thanks

Edward



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Allan In NE

02-15-2008 04:54:06




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-15-2008 02:17:46  
Oh horse-feathers!

Widening the gap makes 'em idle sooooo much smoother.

Those units absolutely cannot stand a poor ground; will fry that pickup in a heartbeat.

Also, take a long hard look at your coil. If it's weak, it will cause your symptoms.

Allan



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Bob

02-14-2008 21:28:58




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-14-2008 17:54:45  
WHY did you open the plug gap???

The spark produced by the Pertronix module isn't any hotter than a good, new set of points.

It's true the spark doesn't degrade over time like with points, but original-style Pertronix unit is NOT "HEI".



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Brownie450

02-14-2008 18:19:45




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-14-2008 17:54:45  
Pull the engine over & get #1 on TDC. Take the dist. cap off & see if the rotor is pointing to the #1 cylinder contact on the distributor cap. Should be very close. If it isn't, timing is probably off. If rotor is on #1 contact, look for moisture/ cracks in the dist. cap. Are wires solid or resistor? If resistor, check continuity with an ohmmeter. Bad wires will show high resistance[over 10,000 ohms].

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504-2

02-14-2008 18:06:20




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 Re: testing for miss-fire with electronic ignition in reply to a_lead, 02-14-2008 17:54:45  
Check your plugs and regap them to .030



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