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Spark plug interpretation
I just pulled my plugs, and would appreciate some assistance in interpretation, as this is my first time, and I don't really trust my own interpretation. Sorry if they're not #'d right, I don't know the correct ordering, so I just numbered them 1-6, starting from left top down, then right top down :
1 4 2 5 3 6 From comparing them to the pic in the Haynes manual, Im thinking I may have some oil deposits on 2, 3, 4 and 6. 1 and 5 look pretty good. On the blacker ones, there doesn't look to be any sludge or oily crap, they're just black (looks more like carbon or soot). Thanks for any help! Chris 
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Current: 1987 911 cabrio Past: 1972 911t 3.0, 1986 911, 1983 944, 1999 Boxster |
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05-21-2005, 07:36 AM
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Also forgot to mention that according to 101 Projects, I'm hoping it might just be regular deposits from gas. ("modern gasoline formulations sometimes can make the spark plugs black or sooty, even when the car is running properly"). I also suspect my mixture is rich.
They're Champions, and I'll be replacing them with Bosch.
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Current: 1987 911 cabrio Past: 1972 911t 3.0, 1986 911, 1983 944, 1999 Boxster Last edited by Christien; 05-21-2005 at 07:53 AM.. |
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05-21-2005, 07:48 AM
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Registered
Join Date: Aug 2002
Location: Galivants Ferry, SC
Posts: 10,550
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They Haynes manual ( I believe) still gives you info as if the plugs came from a pre-emissions controlled car. They never ( I believe) updated the pictures.
The plug pics shown by Haynes will not match a "modern" ( post 1970, say) car. Today's plugs will look toward white / grey and be OK. Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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05-21-2005, 08:11 AM
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Location: Galivants Ferry, SC
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Oops...just saw you have a 72....maybe there is a meanigful "reading" you can take on these plugs.
I'll take a first crack....fairly OK with some small oil control problem on the motor..looks somewhat oil soaked / fouled...but hard to read over the internet. Doesn't seem serious. Others? Wil
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Wil Ferch 85 Carrera ( gone, but not forgotten ) |
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05-21-2005, 08:54 AM
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Thanks Wil.
If it makes any difference, my Haynes shows the first publication year as 1977, or at least that's the first copyright year in there. A bit more info: I've got Zenith carbs, and I probably had some extra gas blow through there at one point - I unknowingly hooked an MFI fuel pump up when changing the original leaky one, which, with its 25psi gas flow, blew gas right through the cylinders and out the bottom of the engine, with no combustion occuring. Just finished putting the new plugs in. Didn't notice any difference at idle, but I haven't yet taken it out for a drive to see if there's any difference. Heh, at least it starts properly 
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Current: 1987 911 cabrio Past: 1972 911t 3.0, 1986 911, 1983 944, 1999 Boxster |
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05-21-2005, 09:14 AM
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Location: Greater Metropolitan Nimrod, Oregun
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post a pic of the electrodes (end on) & state what your '72 T has - MFI?
BTW, this is too rich: 
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"A man with his priorities so far out of whack doesn't deserve such a fine automobile." - Ferris Bueller's Day Off |
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05-21-2005, 09:43 AM
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Sorry if this a retarded question, but what are the electrodes? The end of the plug wires? I can't tell from the pic you posted.
I've got Zenith carbs. Thanks, Chris
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Current: 1987 911 cabrio Past: 1972 911t 3.0, 1986 911, 1983 944, 1999 Boxster |
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05-21-2005, 09:49 AM
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1972 Porsche 911T 2.4
