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# 1 spark plug carbon fouling

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Rick B. Silvert

07-03-2003 23:14:43

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I have a recuring problem with #1 plug (front of engine) fouling with carbon from what one would describe as an over rich fuel mix. Trouble is that the other three plugs look great. Compression is good ( 115 dry, 120 wet) I am wondering if maybe the T-stat is not regulating temperature high enough and the resulting in-rush of "cool" liquid from the radiator is intialy cooling that first cylinder such that it never gets hot enough? The troublesome plug does seem to stay adequately clean when the engine is heavely loaded as in sustained brush hogging. Anyone else experience this trouble? Thnx Bman

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dan hill

06-07-2005 03:36:06

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Re: # 1 spark plug carbon fouling in reply to Rick B. Silverton OR, 07-03-2003 23:14:43

Had the same problem with my 600.Turned out to be lousy gas.Never happens now.I avoid that suppliers gas.Always did it on start up.

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ah_lee

05-22-2004 03:01:57

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Re: # 1 spark plug carbon fouling in reply to Rick B. Silverton OR, 07-03-2003 23:14:43

I have the same problem but it's plug #2 consistently. I have changed the coil, cables and distributor and I even swap the plugs. Still the #2 plug get fouled up.

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Rick B.

07-05-2003 00:31:05

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Re: # 1 spark plug carbon fouling in reply to Rick B. Silverton OR, 07-03-2003 23:14:43

Thanks for the info guys. I should have mentioned that I am running H12s. The question still remains as to why one plug is fouling and not the others. It is definitly gas carbon and not oil. I suppose a bad plug wire might be culpret so I will try and singal that out. There is a stat in the hose and I thought maybe I could use a candy thermometer to check coolant temp, although Im not sure if it is supposed to run in the 180s like autos or something less.

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farmerjohn

04-01-2004 06:36:03

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Re: Re: # 1 spark plug carbon fouling in reply to Rick B., 07-05-2003 00:31:05

2n tractor had a valve job done in the fall went out to start it din't start took the bottom hose off the carb antifreese came out of it checked the oil water in it thanks for any help you can give me farmer john

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Rob

07-05-2003 03:16:11

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Re: Re: # 1 spark plug carbon fouling in reply to Rick B., 07-05-2003 00:31:05

Stat opens at 160.
Check the dist cap for a crack or that plug wire might be bad. You may have a sticky valve but it seems you could hear that.
Adjust your fuel mix, you don't need a rich mix with that carbon thing going on.
One more thing, you might have marginal ignition voltage. Check the voltage drop from the batt to the coil. You want 0.3v or less. Get that right and you will have a hotter spark. Go over the ignition circuit wiring and take apart every connection. Clean all post, terminals, and connectors with a wire brush, replace any worn or damaged connectors, and repair or replace any worn or frayed wires. I use dielectric silicone compound (spark plug boot lube) on my electrical connections. Keeps em dry, prevents any leakage, and lets me feel confident I've done all I can for good connections. If you still can't get the voltage drop down it might need a new ignition switch. Anyway, find any excessive voltage drop and get to 0.3v or less.

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07-04-2003 22:21:18

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Re: # 1 spark plug carbon fouling in reply to Rick B. Silverton OR, 07-03-2003 23:14:43

Have you tried a new set of plug wires- the real copper ones?

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Crockett

07-04-2003 19:48:21

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Re: # 1 spark plug carbon fouling in reply to Rick B. Silverton OR, 07-03-2003 23:14:43

Rick:
Had the same problem. Try set of auotolite 437'S ? (I think that's the number, check the archives). They never Foul. HTH

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Bob

07-04-2003 08:13:02

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Re: # 1 spark plug carbon fouling in reply to Rick B. Silverton OR, 07-03-2003 23:14:43

I agree... try an H-12 in that cylinder. As far as the head temperature near the #1 spark plug, that should be the HOTEST area of the head. The waterpump pulls cooled water from the radiator and forces it into the lower block area, and the hot water from the whole engine flows to the front of the head, and then through the thermostat, and into the top of the radiator.

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Rob

07-04-2003 04:03:11

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Re: # 1 spark plug carbon fouling in reply to Rick B. Silverton OR, 07-03-2003 23:14:43

I see carbon fouling but not on that plug.
Interesting theory, sounds like you suspect a bad or missing tstat. Easy to test. 160 degree stat and it inserts into the top radiator hose down close to the engine. Bimetal temp sensing element on the engine side. Check yours.
Get a hotter plug too. Stock was Champion H10 and guys go with the hotter H12 to reduce fouling. Only need to change one.
Hold that spark plug boot next to some metal and check for a regular hot spark. I have one of those $1.69 plastic spark plug boot puller thingies that I dug out to use on my N, forgot I had it. Now I can manipulate those plug wires without getting BIT ALL THE TIME! Love it.
If a GOOD spark isn't there EVERY time and COMPLETELY regular you need to check the plug wire or even get into the distributor. The N has been known to run pretty much just fine, from most all outward appearances, with one cylinder awol so don't be too surprised if that cylinder is missing or only participating in a half-hearted manner with a weak spark compared to the others.

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