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Spark Plug analysis (Read 12339 times)
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Spark Plug analysis
05/24/04 at 05:27:01
 
Well before I get in too deep with what I have said about spark plugs and determining if the engine is lean or rich etc...I will fill you in on what Champion has to say.

In my opinion the first 2 are similiar if #2 is caught early enough so it is often hard to tell unless you are around engines quite often to diagnose if there really is a problem or not.

Myself, I would rather see the plugs slightly wet.  This will indicate adequate fuel/oil within the engine and that timing is not advanced too far also that the water pump is in decent working condition.

NORMAL
Light tan or gray colored deposits indicate good engine and ignition system condition.  

OVER HEATING
Electrodes badly eroded.<-- this is not immediate.  Premature gap wear.  Insulator has a gray or white appearance.


COLD FOULED
Wet Fuel/Oil deposits can be caused by "drowning" with raw fuel mix durning cranking, rich carburetion or improper fuel/oil raitos.  Weak ignition can also contribute to this condition.

CARBON TRACKING
Electrically conductive deposits on the firing end provide a low resistance path for the voltage.  Carbon tracks are formed and misfire could occur.

ALUMINUM THROW OFF
Preignition has occured.  Not a plug problem   check engine to determine cause and extent of damage.

I thought I would write this up as there have been a few questions regarding spark plugs lately.

TMD

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chuckthehook
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Re: Spark Plug analysis
Reply #1 - 02/14/11 at 02:24:20
 
When changing plugs in a 2003 Evinrude 225 do they need to be indexed?
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The Marine Doctor
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Re: Spark Plug analysis
Reply #2 - 02/14/11 at 22:18:18
 
If its the Ficht engine I believe they do

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Stalkin Walleye
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Re: Spark Plug analysis
Reply #3 - 06/15/11 at 02:31:11
 
I have a 91 Johnson 140 VRO. I would like to put new plugs in it. Could you tell me the best kind I should be putting in?? And anything else I should know about plugs. The old ones seem a little wet or to much fuel on them.
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Re: Spark Plug analysis
Reply #4 - 07/13/11 at 20:28:29
 
Question i have a 1989 force 120 hp three of my spark plugs are working fine but my number two plug dose not look like it is firing . It dose show very little uasage . Can anybody help .

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Re: Spark Plug analysis
Reply #5 - 07/14/11 at 01:34:04
 
Low compression or no spark

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Re: Spark Plug analysis
Reply #6 - 07/18/11 at 04:28:12
 
I have no spark coming out of number two plug .
Help
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The Marine Doctor
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Re: Spark Plug analysis
Reply #7 - 07/20/11 at 01:34:48
 
Not directly, but you can move some of the wires around..."without" operating the engine and see if you can isolate the part that is not working.

Its either a coil or the pack.

TMD
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Re: Spark Plug analysis
Reply #8 - 08/22/11 at 10:18:44
 
THANK_FOR_ALL
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