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SuzukiSavage.com
/cgi-bin/YaBB.pl General Category >> Rubber Side Down! >> Spark plug continues to foul, help /cgi-bin/YaBB.pl?num=1288831811 Message started by 99savage on 11/03/10 at 17:50:11 |
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Title: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 17:50:11 My 99 Savage has developed a weird problem over the last few months. Ran great, progressively became hard to start, then wouldn't start at all. I changed the plug and all was great. Then the cycle repeated itself. I'm currently on the 3rd plug and now its "fouled". They are no major visual signs of fouling. I've been using NGK DP7EA-9 gapped at .033; would a different (colder) plug be better? |
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Title: Re: Spark plug continues to foul, help Post by verslagen1 on 11/03/10 at 17:54:48 Check your petcock, put the vac line and check for gas. |
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Title: Re: Spark plug continues to foul, help Post by Serowbot on 11/03/10 at 18:04:15 Test yer' petcock... here's how... http://suzukisavage.com/cgi-bin/YaBB.pl?num=1251932429 ... add another Suzuki petcock to the heap... I'm thinking of starting a "Creative uses for your old broken Suzuki petcock" thread... :-? |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 18:07:13 273423223D3036343F60510 wrote:
Thanks, I did that and everything checked okay with the vacuum line (no gas even if I sucked on it). Pulled the supply line and had steady flow when on prime, no flow otherwise. Also checked for fuel in bowl and it drained and refilled after reconnecting the supply line. |
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Title: Re: Spark plug continues to foul, help Post by Serowbot on 11/03/10 at 18:12:21 In that case,... could you be jetted too rich?... is it stock jetting?... air filter clean?... ... or you may have a sticky slide in the carb.... |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 18:14:02 6375627F67727F64100 wrote:
I'll be swapping out the petcock this weekend just to be safe, but I'm still confused how a bad petcock would ruin a spark plug in such a few weeks over the period of a few hundred miles. |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 18:17:09 4F594E534B5E53483C0 wrote:
Stock jetting, no mods, new air filter (even checked for gas in air box for flooding, none there), fresh fuel etc. |
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Title: Re: Spark plug continues to foul, help Post by verslagen1 on 11/03/10 at 18:26:05 well that covers the usual issues... I'd drop the bowl and take a look at the jets. sometimes the jet will back out if loose. or it can act rich if the washer under the main jet was left off. next, how many turns out is your idle jet? more than 3 turns and it can vibe out. |
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Title: Re: Spark plug continues to foul, help Post by Serowbot on 11/03/10 at 18:32:40 76763C2E392E282A4F0 wrote:
I'll be swapping out the petcock this weekend just to be safe, but I'm still confused how a bad petcock would ruin a spark plug in such a few weeks over the period of a few hundred miles.[/quote] If the diaphragm is leaking in the petcock, it will leak extra fuel down the vacuum line and inject it directly into the intake... this makes a variable rich condition that will definitely foul plugs like crazy... May not be your problem, as you say you got no fuel from the vac line when you sucked on it. It often is the problem though... The other thing,.. as I said,... might be the carb slide getting sticky... |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 18:47:33 2335223F27323F24500 wrote:
I'll be swapping out the petcock this weekend just to be safe, but I'm still confused how a bad petcock would ruin a spark plug in such a few weeks over the period of a few hundred miles.[/quote] If the diaphragm is leaking in the petcock, it will leak extra fuel down the vacuum line and inject it directly into the intake... this makes a variable rich condition that will definitely foul plugs like crazy... May not be your problem, as you say you got no fuel from the vac line when you sucked on it. It often is the problem though... The other thing,.. as I said,... might be the carb slide getting sticky...[/quote] I had the carb off and cleaned it after the second plug and everything seemed fine. |
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Title: Re: Spark plug continues to foul, help Post by verslagen1 on 11/03/10 at 19:07:09 70703A283F282E2C490 wrote:
Did you do any work on it prior to it fouling out? |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 19:10:44 574453524D4046444F10210 wrote:
Idle jet is only 1 turn out (I adjusted according to the directions on this forum, Lancer's I believe). Is it possible that it is a coil problem (long shot I know) or poorly adjusted valves (runs great on fresh plug however)? Do you suggest switching to a colder plug when I swap the petcock? |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 19:12:46 4B584F4E515C5A58530C3D0 wrote:
Did you do any work on it prior to it fouling out?[/quote] Nothing at all. After fouling the first 2 plugs, that's when I pulled the carb. That and the fact that I had a stuck float. Made no adjustments just cleaning, checking, and reinstalling. Seemed fine again for a while, and then it ran the same course. |
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Title: Re: Spark plug continues to foul, help Post by verslagen1 on 11/03/10 at 19:15:29 if it's fouling out, then's there's a reason. If you had access to a spare coil or CDI, I'd swap them. But due the easy stuff 1st. How's your battery? low voltage can make a sour plug. check all the grounds. |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 19:23:28 3C2F3839262B2D2F247B4A0 wrote:
New AGM Big Crank fully charged. Cranks very strong just won't fire. |
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Title: Re: Spark plug continues to foul, help Post by verslagen1 on 11/03/10 at 19:25:40 then it's the coil or CDI |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 19:45:26 3F2C3B3A25282E2C2778490 wrote:
Any idea why the plug would be great at first and get progressively worse? Is that symptomatic of a bad coil or cdi? |
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Title: Re: Spark plug continues to foul, help Post by verslagen1 on 11/03/10 at 19:59:09 last one in thread... http://suzukisavage.com/cgi-bin/YaBB.pl?num=1285706552/8#8 http://suzukisavage.com/cgi-bin/YaBB.pl?num=1279724838/5#5 Diagnostics in this one... http://suzukisavage.com/cgi-bin/YaBB.pl?num=1268914576/56#56 |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/03/10 at 20:09:25 475443425D5056545F00310 wrote:
Thanks. |
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Title: Re: Spark plug continues to foul, help Post by Boofer on 11/04/10 at 19:43:43 Is there any smoke at the exhaust? A stuck or broken ring causing low compression could be causing hardstart, and the oil may be slowly passing to the plug electrode. |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/05/10 at 05:07:09 0B26262F2C3B490 wrote:
Very little smoke at start up. I'm beginning to think that I am possibly fouling the plug because of the carb being tuned too lean. I plan to first change plugs and then follow Lancer's directions to tune it before swapping petcocks. The reason I think this is because it is only 1 turn out. I possibly didn't idle up before adjusting giving me a false "reading". |
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Title: Re: Spark plug continues to foul, help Post by Oldfeller on 11/05/10 at 05:11:26 Sorry, lean doesn't foul your plugs. It makes them turn white. Way too rich does foul your plugs (crumbly dry black), as does oil consumption (greasy black). |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/05/10 at 06:11:44 60434B494A43434A5D2F0 wrote:
Plugs can be damaged due to excessive engine temperature which can result from lean condition I believe. Maybe my use of the word "foul" is incorrect. |
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Title: Re: Spark plug continues to foul, help Post by EJID on 11/05/10 at 07:37:50 So what exactly have your plugs looked like? http://www.aa1car.com/library/reading_spark_plugs.jpg |
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Title: Re: Spark plug continues to foul, help Post by justin_o_guy2 on 11/05/10 at 08:06:33 Pick the pic closest to your plugs look, please.. Handy little chart, Nice! |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/05/10 at 09:34:56 203F393E23241525152D3F33784A0 wrote:
I haven't pulled the current plug yet. The others that have stopped firing, IIRC, have looked closest to "normal" or "too hot". I'll pull it over the weekend and post my findings then. |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/06/10 at 11:20:31 716E686F72754474447C6E62291B0 wrote:
Just pulled the plug; looks dry, sooty (not built up), and black. Carbon fouling? New plug fires great. New petcock will be here Monday. I'll replace it, clean the tank, check the carb adjustment per Lancer's directions, and go from there. Thanks |
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Title: Re: Spark plug continues to foul, help Post by 99savage on 11/07/10 at 17:17:00 New plug now looks just like the one I took out, so I decided to check out some other things. Valves are dead on .004" I decided to pull the carb and disassemble it to just be sure. That's when I discovered that after messing with the carb tuning for so long, the fuel mixture screw is buggered up to the point that it will be tough to get out to replace it. To prevent ordering more parts than what I need, what comes with a carb rebuild kit? Thanks |
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