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Spark plug wires and an off topic furnace question

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Joe in MI

01-29-2008 13:02:06




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My 51 8n sidemount hasn't been running all that great - sputters under load a little. I used Dell's calibrated spark tester (new sparkplug gapped out) and lit myself up like a Christmas Tree.:shock: (yes, I was holding onto the wire and not the plug) I'm going to replace the old and apparently compromised motorcraft sipcon wires the previous owner installed with the old fashioned copper core ones as soon as I can, which brings me to my first question - is there supposed to be a loom of some kind for these wires? Or was that only on the older model Ns? The wires are touching the tank and head in several places right now - I can't believe its supposed to be like that. Also - the wire from the top of my coil is bent up against the bottom of the gas tank (too tall for the clearance) - should that be adjusted or replaced with something different?

Now the off topic -
If there are any HVAC people out there - My propane forced air furnace has developed a little quirk - Normally when the thermostat indicates we need heat, the vent motor runs for a minute or two, followed by gas ignition and the main blower turning on. The last few days the main blower will turn on all by itself for a few seconds, then power down. Everytime this happens the temperature seems to be one degree above the setting on the thermostat. This seems to happen a few times a day, but not between every normal cycle of the furnace. Any ideas?

By the way - 42 degrees and foggy here - supposed to get cold and snowy tonight. Yesterday we had 14 inches of snow on the ground. Now we have about 4 inches. :(
Thanks!

Joe

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Joe in MI

01-30-2008 05:39:54




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 Re: Spark plug wires and an off topic furnace question in reply to Joe in MI, 01-29-2008 13:02:06  
Thanks for the help guys - espicially the link Dunk posted. Of course, the furnace hasn't done it since I posted that message. The only other thing I can think of is the programmable T-Stat. The "low battery" indicator was blinking yesterday morning. I changed the batteries, but the blower still came on by itself. Late last night I looked at the T-Stat to make sure it wasn't on "cool." It wasn't, but I flipped the switch to "cool" and then back to "heat" again. Knock on wood, it hasn't done it since. Maybe just a digital fluke caused by the low battery and it needed a reset. If it happens again, I'm gonna look into the fan controller Dunk's link talks about.

I'm going to change the plug wires in the 8N ASAP. Like Old said, at least I know I have good spark!

Have a good day everybody!

Joe

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Dunk

01-29-2008 14:46:51




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 Re: Spark plug wires and an off topic furnace question in reply to Joe in MI, 01-29-2008 13:02:06  
Most furnaces have an adjustable fan/limit switch, that can get a little out of calibration, most are adjustable, and the adjustment can be increased just a bit to stop that if it annoys you.

Let me see if I can find a thousand words, err, I mean a pic.



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old

01-29-2008 14:35:56




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 Re: Spark plug wires and an off topic furnace question in reply to Joe in MI, 01-29-2008 13:02:06  
One thing you can say if you know it has a good spark if it lit you p like that. I had to do a check like that the other day on a tractor because I could not hold the plug wire close to the block and turn the engine over by hand at the same time. Different brand of tractor. I pulled it past the impulse and I jumped so I knew it had good spark. Heck of a way to test for spark but it works LOL

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Mt. Airy Mose

01-29-2008 14:07:45




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 Re: Spark plug wires and an off topic furnace question in reply to Joe in MI, 01-29-2008 13:02:06  
Check your vent motor/fan. Your unit could be shutting down after a few moments of run time because the vent motor/fan is not creating the negative air pressure required to satisfy the furnaces internal safety sensors. I experienced this condition on my oil furnace just last month. I hope this helps.

Mose



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TheOldHokie

01-29-2008 13:40:16




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 Re: Spark plug wires and an off topic furnace question in reply to Bob, 01-29-2008 13:02:06  

Joe in MI said: (quoted from post at 14:02:06 01/29/08)
Now the off topic -
If there are any HVAC people out there - My propane forced air furnace has developed a little quirk - Normally when the thermostat indicates we need heat, the vent motor runs for a minute or two, followed by gas ignition and the main blower turning on. The last few days the main blower will turn on all by itself for a few seconds, then power down. Everytime this happens the temperature seems to be one degree above the setting on the thermostat. This seems to happen a few times a day, but not between every normal cycle of the furnace. Any ideas?

Joe


Don't know - sounds pretty normal. A lot of furnaces will cycle just the blower motor if plenum temps reach the blower cut-in temperature. Plenum temp will build by itself after the burner shuts off just from residual heat buildup on some models.

TOH

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Dell (WA)

01-29-2008 13:36:50




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 Re: Spark plug wires and an off topic furnace question in reply to Joe in MI, 01-29-2008 13:02:06  
Joe..... ....real copper-core sparkie wires, cut-to-fit. ok?

Modern anti-radiostatic carbon-core wires cannot be cut-to-fit 'cuz carbon-core is "string" and without specialized crimping tools cannot be reliably connected. That is why yer present sipcon sparkie wires are touching stuff.

The sidemount sparkie wires have just one grommet on a bracket to feed all 4-wires thru. Iff'n you don't have one, just use some plastic zip-ties to gather wires neatly together into a nice self-supporting loom..... ...Dell, yer self-appointed sparkie-meister

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