Read my plugs
06-14-2006, 10:42 PM
#1
Read my plugs Can some please shed a bit of light on these plugs. Getting a flashing SES light and #5 showed the most misfires. Only at cruise when in 5th & 6th. I know the picture is not the best but the darker plug is from # 5. I also pulled the #1 plug for comparison. As you can see #1 is clean and white and #5 is dark and brown.
These are new plugs with on a 100-150 miles on them. So with that I can see why #1 is so clean and nice. Next is a compression check for #5, to see if I have a problem there.
With the excessive brown on the insulator, I am thinking I might have damaged a ring gland, and now getting a bit (blow by) of oil in the cylinder.
Note: had a 1/4 inch of oil in my catch can after the 100-150 miles, can was empty-ed and cleaned when all plugs were replaced.
My A/F is about 11.8-12.0 @ WOT So I am sure it is not a lean condition.
These are new plugs with on a 100-150 miles on them. So with that I can see why #1 is so clean and nice. Next is a compression check for #5, to see if I have a problem there.
With the excessive brown on the insulator, I am thinking I might have damaged a ring gland, and now getting a bit (blow by) of oil in the cylinder.
Note: had a 1/4 inch of oil in my catch can after the 100-150 miles, can was empty-ed and cleaned when all plugs were replaced.
My A/F is about 11.8-12.0 @ WOT So I am sure it is not a lean condition.
Last edited by 618HAWK; 06-15-2006 at 12:08 AM.
06-15-2006, 12:52 AM
#2
Kinda stating the obvious, but could #5 be incorrectly gapped? I would check that, as well as the compression test to see if you're getting blow-by, check the wire to #5 to see that it's not damaged... could be things that aren't so major as damaged ringlands.
06-15-2006, 01:05 AM
#4
Originally Posted by ArcticZ28
Kinda stating the obvious, but could #5 be incorrectly gapped? I would check that, as well as the compression test to see if you're getting blow-by, check the wire to #5 to see that it's not damaged... could be things that aren't so major as damaged ringlands.
I thought of a injector as well, but I don't think that would be the cause of the dark brown color would it. Looks like oil, but might swap a injector as well if the Auto Tap Run dose not point to any thing.
Gaps are right on,,,
06-15-2006, 01:30 AM
#5
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#1 looks lean, bleached white porcelain. Both have carbon deposits on the facing of the plug (the flat portion on the end of the threads). Almost looks like you have a timing mark about to show on #1 (the line of color change on the grounding strap), but cant really tell from being so faint.
I recommend you put the plugs in, check it with your Tech. Then taking your camera with you, go do a WOT BLAST, pull thru as long as you can "legally" and safely, a good two three will work. As soon as you get off the WOT, shut the car down, pull the plugs and snap a picture, try to do a macro from the mid-threaded portion up. A nice side shot and a front (holding it so the grounding strap can be seen with the "gap" to one side or another, and for the front use a slight 20* angle looking down at the porcelain with the gap facing you). The WOT blast is necessary for a fueling and timing reading, as well as when you let off if you coast with the engine on it will "wash" away any deposits, timing marks etc.. I will try to remember to check back here, via subscribe, but if you post and I dont catch it in 30min pm me please. Thanks and GL
Charlie
I recommend you put the plugs in, check it with your Tech. Then taking your camera with you, go do a WOT BLAST, pull thru as long as you can "legally" and safely, a good two three will work. As soon as you get off the WOT, shut the car down, pull the plugs and snap a picture, try to do a macro from the mid-threaded portion up. A nice side shot and a front (holding it so the grounding strap can be seen with the "gap" to one side or another, and for the front use a slight 20* angle looking down at the porcelain with the gap facing you). The WOT blast is necessary for a fueling and timing reading, as well as when you let off if you coast with the engine on it will "wash" away any deposits, timing marks etc.. I will try to remember to check back here, via subscribe, but if you post and I dont catch it in 30min pm me please. Thanks and GL
Charlie
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06-24-2006, 10:54 PM
#8
Well as luck would have it. After swapping plugs, coil, wire. Still had misfire on #5. Preformed a compression check and my thoughts were confirmed. 65psi. 1,3,7 were 150-160. Did not even bother to look at the Rh side.
I new it was only a matter of time, but did not think it would have happened so soon.
I new it was only a matter of time, but did not think it would have happened so soon.
