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[GMCnet] How to heat up the Onan ignition? [message #194029]

Wed, 26 December 2012 09:00

Robin Hood

Messages: 1078
Registered: April 2011

Karma:

Senior Member

Well, I've got the Onan back together after decarbonizing the heads
and cylinders, oil change, etc. The intake and exhaust manifods are
painted smurf blue and high temp black, respectively.

it's refusing to start. It coughed a couple of times, and that was it.
I run my battery down trying to get it started. It hasn't even coughed
since.

It was working fine(ish) for a while before I took it apart.

To me, the symptoms are screaming "ignition." The carb is working, as
evidenced by the fact that it's so cold that condensation was forming
on it, yesterday, indicating a phase change from liquid to gas. Air
isn't a problem. As an aside, my electric choke works now that I've
taken stuff apart and cleaned it up and put it back together.

I sprayed the spark plugs with carb cleaner and wiped 'em off with a
paper towel. They're pretty much new, and don't look particularly
fouled. I've heard that there's a way to look at the end of a spark
plug and it tells you something about the conditions under which it
runs (rich or lean, temperature, something like that) but I'm not to
that point in my mechanical education yet, it seems. The plugs are
properly gapped.

So, I see that from a timing perspective, the Pertronix upgrade helps
with a consistently timed spark... but it's a weak spark. Also, I'm
given to understand that the Onan's spark is pretty weak, since it
fires both plugs whether a particular cylinder needs it or not,
halving the "oomph" available to make the fuel/air mixture go "Bang".

Is there a way to get a more powerful spark into the Onan's spark
plugs? Is there a different coil that will help? If it's worth doing,
it's worth overdoing. :) The thing is out of my coach right now, and I
may as well do as much to it as I can while it's easy, right?

--
Robin Hood
Jackson, MS
2003 Buick Lesabre
1968 Pontiac Catalina
1978 GMC Royale motorhome
1977 GMC Palm Beach motorhome
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[Message index]

		[GMCnet] How to heat up the Onan ignition? By: Robin Hood on Wed, 26 December 2012 09:00
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Wed, 26 December 2012 09:30
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Wed, 26 December 2012 09:44
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Henderson on Wed, 26 December 2012 10:06
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Wed, 26 December 2012 10:14
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Wed, 26 December 2012 14:12
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Wed, 26 December 2012 20:00
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Henderson on Thu, 27 December 2012 22:03
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Fri, 28 December 2012 07:20
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Fri, 28 December 2012 07:51
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Fri, 28 December 2012 07:56
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Fri, 28 December 2012 08:02
		Re: [GMCnet] How to heat up the Onan ignition? By: C Boyd on Fri, 28 December 2012 08:39
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Fri, 28 December 2012 08:58
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Fri, 28 December 2012 09:32
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Fri, 28 December 2012 09:41
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Fri, 28 December 2012 09:55
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Fri, 28 December 2012 09:56
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Sat, 29 December 2012 02:39
		Re: [GMCnet] How to heat up the Onan ignition? By: USAussie on Sat, 29 December 2012 07:00
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Sat, 29 December 2012 07:23
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Sat, 29 December 2012 07:50
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Sat, 29 December 2012 08:17
		Re: [GMCnet] How to heat up the Onan ignition? By: Matt Colie on Sat, 29 December 2012 08:43
		Re: [GMCnet] How to heat up the Onan ignition? By: WD0AFQ on Sat, 29 December 2012 08:59
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Sat, 29 December 2012 10:35
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Sat, 29 December 2012 11:00
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Sat, 29 December 2012 17:48
		Re: [GMCnet] How to heat up the Onan ignition? By: jtblank on Sun, 30 December 2012 01:47
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Mon, 31 December 2012 07:42
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Sun, 30 December 2012 18:00
		[GMCnet] How to heat up the Onan ignition? By: Robin Hood on Sun, 30 December 2012 19:13
		Re: [GMCnet] How to heat up the Onan ignition? By: sgltrac on Sun, 30 December 2012 19:34
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Sun, 30 December 2012 20:22
		Re: [GMCnet] How to heat up the Onan ignition? By: USAussie on Sun, 30 December 2012 21:10
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Sun, 30 December 2012 21:26
		Re: [GMCnet] How to heat up the Onan ignition? By: USAussie on Sun, 30 December 2012 22:05
		Re: [GMCnet] How to heat up the Onan ignition? By: C Boyd on Mon, 31 December 2012 09:56
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Tue, 01 January 2013 12:03
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Tue, 01 January 2013 12:59
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Tue, 01 January 2013 13:14
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Tue, 01 January 2013 15:58
		Re: [GMCnet] How to heat up the Onan ignition? By: A Hamilto on Tue, 01 January 2013 16:51
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Fri, 04 January 2013 07:34
		Re: [GMCnet] How to heat up the Onan ignition? By: Matt Colie on Fri, 04 January 2013 08:50
		Re: [GMCnet] How to heat up the Onan ignition? By: C Boyd on Tue, 01 January 2013 13:20
		Re: [GMCnet] How to heat up the Onan ignition? By: WD0AFQ on Tue, 01 January 2013 14:23
		Re: [GMCnet] How to heat up the Onan ignition? By: C Boyd on Tue, 01 January 2013 14:37
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Tue, 01 January 2013 14:16
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Tue, 01 January 2013 14:25
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Sun, 30 December 2012 22:18
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Sun, 30 December 2012 22:30
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Mon, 31 December 2012 08:09
		Re: [GMCnet] How to heat up the Onan ignition? By: mike miller on Sat, 29 December 2012 02:52
		Re: [GMCnet] How to heat up the Onan ignition? By: JohnL455 on Wed, 26 December 2012 20:32
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Burton on Thu, 27 December 2012 03:43
		Re: [GMCnet] How to heat up the Onan ignition? By: Steven Ferguson on Thu, 27 December 2012 07:46
		Re: [GMCnet] How to heat up the Onan ignition? By: C Boyd on Thu, 27 December 2012 19:00
		Re: [GMCnet] How to heat up the Onan ignition? By: USAussie on Thu, 27 December 2012 20:00
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Burton on Thu, 27 December 2012 21:47
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Thu, 27 December 2012 21:57
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Burton on Thu, 27 December 2012 23:06
		Re: [GMCnet] How to heat up the Onan ignition? By: LarryInSanDiego on Thu, 27 December 2012 23:17
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Burton on Thu, 27 December 2012 23:22
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Fri, 28 December 2012 07:39
		Re: [GMCnet] How to heat up the Onan ignition? By: Matt Colie on Fri, 28 December 2012 10:29
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Fri, 28 December 2012 13:58
		Re: [GMCnet] How to heat up the Onan ignition? By: LarryInSanDiego on Fri, 28 December 2012 14:39
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Fri, 28 December 2012 17:48
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Sat, 29 December 2012 10:16
		Re: [GMCnet] How to heat up the Onan ignition? By: Matt Colie on Fri, 28 December 2012 21:56
		Re: [GMCnet] How to heat up the Onan ignition? By: jhbridges on Fri, 28 December 2012 07:33
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Burton on Sun, 30 December 2012 02:58
		Re: [GMCnet] How to heat up the Onan ignition? By: WD0AFQ on Sun, 30 December 2012 07:09
		Re: [GMCnet] How to heat up the Onan ignition? By: USAussie on Sun, 30 December 2012 07:40
		Re: [GMCnet] How to heat up the Onan ignition? By: Robin Hood on Sun, 30 December 2012 07:56
		Re: [GMCnet] How to heat up the Onan ignition? By: Ken Burton on Sun, 30 December 2012 22:35

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