What do ya think is up here...plug reading Q?
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What do ya think is up here...plug reading Q?

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    Senior Member H20MOFO's Avatar
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    Default What do ya think is up here...plug reading Q?

    The dark plug is out of #4(smells like fuel)....the other 7 plugs look like the light one. Not sure what to think..maybe bad plug wire? 2 hours run time before that the dark plug looked like the good plug.Click image for larger version. 

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    here is the rest of em
    Attached Thumbnails Attached Thumbnails Click image for larger version. 

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    Last edited by H20MOFO; 08-08-2011 at 08:09 PM.
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    Senior Member EVILFORCE's Avatar
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    I would start with checking the wire and compression. Could just be a bad plug.
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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by EVILFORCE View Post
    I would start with checking the wire and compression. Could just be a bad plug.
    Time to buy a new multi meter to check the wire...fwiw the plug that is marked 8 was in the #4 hole last friday. Well...you know what I mean.lol so the plug deal is out....just checked my valves also.
    Last edited by H20MOFO; 08-08-2011 at 08:26 PM.
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    Senior Member lbhsbz's Avatar
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    The dark one Is firing....otherwise it would look new. #4 is fat for some reason....can't have soot without fire.....do a compression check
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    gn7
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    If its a tunnel ram, pull the float bowl over that cylinder and see if the jet fell out. It happens.



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    Check the heat from that cylinder is it burning? Temp gun or take a handle of an old screwdriver and place on the exhaust pipe with the others and see how hot it's burning.

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    79 Sanger Picklefork Tittyman's Avatar
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    Default Multi Meter

    Quote Originally Posted by H20MOFO View Post
    Time to buy a new multi meter to check the wire...fwiw the plug that is marked 8 was in the #4 hole last friday. Well...you know what I mean.lol so the plug deal is out....just checked my valves also.
    Can you explain the process on checking plug wires with a multi meter and what kind of reading should you have..I have Taylor solid core wires like you would use on a mag..thanks..

    Edit: Just went to Taylors website and this is what it said..
    To check the resistance of the wires, use a multi-meter to test the resistance (Ohms) of the leads. Once you have read the resistance of the wire, divide that number by the length of the wire (inches) and this will give you the Ohms per inch. Then multiply the Ohms per inch by 12 to get the Ohms per foot. (700 Ohms / 24" long = 29.16 Ohms per inch x 12 = 300 Ohms).

    I assume my meter should be set at 20,000 or 20K...is that correct..So if the wire is good what kind of reading should I get and what would a number be to show the wire is good...thanks again..
    Last edited by Tittyman; 08-09-2011 at 08:12 AM.
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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by Tittyman View Post
    Can you explain the process on checking plug wires with a multi meter and what kind of reading should you have..thanks..
    On taylors websight it has resistance per foot for their different types of wires...IF I remember right mine are 600 ohms per ft. I will pull the bowl and check the jet thing. I'll see if I can get my pyro to work...it took a bath last year in the boat. Guess this is a good excuse to go buy a compression checker also.
    Edit....fwiw...carb is a 1050 domi on a single plane manifold.
    Last edited by H20MOFO; 08-09-2011 at 07:40 AM.
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    Senior Member Widetrack's Avatar
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    Is the #4 plug always the one sooted up? I have had this happen and the intake valve was open then when transported fresh gas was sloshed or flooded over into the cyl.! It caused a wet look on my #4 plug most of the time! Just a thought!


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    Quote Originally Posted by H20MOFO View Post
    On taylors websight it has resistance per foot for their different types of wires...IF I remember right mine are 600 ohms per ft..
    I think I'd swap plug wires and see what happens to that hole.

    But do check to see if it's building heat.

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    Senior Member H20MOFO's Avatar
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    Quote Originally Posted by Widetrack View Post
    Is the #4 plug always the one sooted up? I have had this happen and the intake valve was open then when transported fresh gas was sloshed or flooded over into the cyl.! It caused a wet look on my #4 plug most of the time! Just a thought!
    I never noticed a difference with the plug until the end of last week when I ran my valves again. Gonna buy a compression tester tonight...if that doesnt show anything I will try a new plug and a wire swap like suggested. On somewhat of a side note I dont recall my other plugs ever looking this lean before...I did lean the idle out earlier this season....and have been running my header dry until about 3k rpm...not sure if that has anything to do with the price of tea in china. Maybe I will pull the bowls tonight....check the jets....and get out some carb cleaner and a compressor.
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    cfm
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    How about a better pic ? Just can't really tell much from the photo.

    The 'lean one's' look rich from here also. Just not as rich of course.

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    Senior Member H20MOFO's Avatar
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    Compression is ok...wasnt great but it was better than the cyl next to it...havent checked the other 6 yet. Here is a little better pic...i think. I am admittedly bad at reading plugs....and these have some idle time on em to.
    Guess I'll pull the carb apart...could a plugged air bleed cause 1 cyl to run rich?
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    gn7
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    Quote Originally Posted by H20MOFO View Post
    Guess I'll pull the carb apart...could a plugged air bleed cause 1 cyl to run rich?
    Yes, and on a tunnel ram it can make one cylinder run rich



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