fouled #2 & #3 plugs - Wrist Twisters
 
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post #1 of 12 Old 08-14-2007, 07:03 PM Thread Starter
 
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Unhappy fouled #2 & #3 plugs

I have had some problems with my # 2 & #3 spark plugs getting fouled out.
I have 8000 miles on the bike. I changed plugs at 5ooo miles. From about 7000 miles to my present 8500 miles. The bike would run ruff till it warmed up.
I thought I might be running a rich mixture of gas to air ratio, because I could see some black smoke out my pipes .

I checked my plugs. 2 and 3 were getting fouled out. I cleaned them. She ran fine for a few days. Then same problem.
I would clean the plugs, a few days latter 2 & 3 fouled out again.

I put new plugs in. Same thing run a few days then 2 & 3 fouled out.

Can anybody tell me what might be going on here. I hate to take it to the stealer I mean dealers shop with some ideal of what my problem is. and how much this will cost me.

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post #2 of 12 Old 08-14-2007, 08:07 PM
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Check the air filter?

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post #3 of 12 Old 08-14-2007, 10:53 PM
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Sounds like a weak coil.
Check for loose primary wire connections on the No.2/No.3 coil.

If all is good. Check initial primary voltage.
It could be a faulty coil or crank shaft position sensor as well.
You will need to do some checks of the system as well as ECM connections.
Make sure everything is proper & not shorted, to start.

Where's Robtharalson to type in all the particulars?

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post #4 of 12 Old 08-15-2007, 04:32 AM
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A clogged air filter would foul all 4 plugs.

It is more likely related to the coils. Could be a poor connection(s) check the obvious first, then move on to the coils. One coil assembly fires cylinders 1 & 4 while the other fires 2 & 3. One troubleshooting tip is to swap the coils. On the primary side the yellow/blue stripe wire fires 1 & 4 while blue/yellow stripe wire fires 2 &3, the black/white stripe wires are common to both coils. Swap the primary wires. Also at the same time swap the secondary plug wires ( #1 plug wire swap with #2 plug wire and #4 plug wire swap with #3 plug wire). Start out with 4 clean plugs, ride the bike and see what happens. If it is coil related the fouled plugs will now be on cylinders #1 and #4 while #2 and #3 will be clean.

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post #5 of 12 Old 08-15-2007, 09:34 AM
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i would guess a cracked #3 plug boot. this one is the most difficult to get to, and easy to damage. (the honda dealer cracked mine trying to change my plugs...)

poor electrical seal on plug = rough running = fouled plugs on that coil.

...j919

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post #6 of 12 Old 08-15-2007, 12:01 PM
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first, it's a honda. so if something's wrong, it's always more likely that a human (probably an american one) messed something up.

it's the wiring/connections. he screwed something up upon reinstall.

nothing personal dude. i cooked a PCIII by connecting it wrong once.

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post #7 of 12 Old 08-15-2007, 02:12 PM
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Quote:
Originally Posted by bucky View Post
first, it's a honda. so if something's wrong, it's always more likely that a human (probably an american one) messed something up.

it's the wiring/connections. he screwed something up upon reinstall.

nothing personal dude. i cooked a PCIII by connecting it wrong once.
Now he just cooks tires!

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post #8 of 12 Old 08-15-2007, 06:04 PM Thread Starter
 
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Quote:
Originally Posted by xrmikey View Post
Sounds like a weak coil.
Check for loose primary wire connections on the No.2/No.3 coil.

If all is good. Check initial primary voltage.
It could be a faulty coil or crank shaft position sensor as well.
You will need to do some checks of the system as well as ECM connections.
Make sure everything is proper & not shorted, to start.

Where's Robtharalson to type in all the particulars?
I thought it might be the coil. So I grounded the plugs to the engine and did a spark test. I got fire on both plugs.

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post #9 of 12 Old 08-15-2007, 06:32 PM Thread Starter
 
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Quote:
Originally Posted by MisterMike View Post
A clogged air filter would foul all 4 plugs.

It is more likely related to the coils. Could be a poor connection(s) check the obvious first, then move on to the coils. One coil assembly fires cylinders 1 & 4 while the other fires 2 & 3. One troubleshooting tip is to swap the coils. On the primary side the yellow/blue stripe wire fires 1 & 4 while blue/yellow stripe wire fires 2 &3, the black/white stripe wires are common to both coils. Swap the primary wires. Also at the same time swap the secondary plug wires ( #1 plug wire swap with #2 plug wire and #4 plug wire swap with #3 plug wire). Start out with 4 clean plugs, ride the bike and see what happens. If it is coil related the fouled plugs will now be on cylinders #1 and #4 while #2 and #3 will be clean.
Thank- you MisterMike. I will try that tonight and see what happens. I got my multimeter out to test the coil. But the book said that I would need to connect a PEAK VOLTAGE ADAPTOR TO MY MULITMETER. I went to sears and a few other places to see if I could find one. Guess what? Yep thats right folks no such critters in this part of the woods.

Thanks again MisterMike.

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post #10 of 12 Old 08-15-2007, 06:41 PM Thread Starter
 
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Quote:
Originally Posted by bucky View Post
first, it's a honda. so if something's wrong, it's always more likely that a human (probably an american one) messed something up.

it's the wiring/connections. he screwed something up upon reinstall.

nothing personal dude. i cooked a PCIII by connecting it wrong once.
No offence taken. I have pulled those plugs out and cleaned so many times here of late, that I have got the drill down. I have looked at wires pushed and pulled till I think I could do in my sleep

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post #11 of 12 Old 08-15-2007, 10:02 PM
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i still think it's something you did. what are the statistical odds that components with no reputation for failure spontaneously failed beginning precisely when you first disturbed them? then, what are the chances that you messed something up? see? it's you ! you don't have a wire on the correct place, or a ground is incomplete. i'd bet a donut on it, and i LOVE donuts ! in fact, i just coined the word, "donution" today.

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post #12 of 12 Old 08-15-2007, 10:05 PM
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oh. wait. (read FIRST bucky) it'd been a while in between plug change and the problem rearing its ugly head. still... i'm looking sternly in YOUR direction, foowee ! (didn't i read about you in mad magazine? no...that was fonebone)

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