Ignition coil
06-25-2003, 11:28 PM
#1
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Ignition coil
In my search for the culprit to the CEL I decided to run the car in complete darkness and see if I saw anything out of the ordinary. While looking at the ignition coils I saw a very small glow that looked like it was coming from the rivets on each side of both coils. When the car was revved up the glow went away..This could be the reason for my random misfires...If anyone has any input into this please feel free to comment....Thanks
06-26-2003, 01:58 AM
#2
Rennlist Member
Last night I just happened to look at my engine in complete darkness also to see if there was any arcing. I saw the same small glow on both coils as well. Since the glow was not arcing anywhere I thought this was natural. I did not rev the car to see if the glow went away.
06-26-2003, 02:29 AM
#3
Instructor
I have seen this also. I have also seen arcing around the distributor cap and some of the plug leads. I am absolutely convinced that the idle roughness that so many of us experience is related to misfiring due to coil and plug lead issues. Although I do not agree with all the "pseudo science" this company uses to promote it's products, I do agree with the analysis of the issues with coil and plug leads described here
<a href="http://www.perma-tune.com/Technical%20Support/Ignition%20Modules/Porsche/993.htm" target="_blank">http://www.perma-tune.com/Technical%20Support/Ignition%20Modules/Porsche/993.htm</a>
<a href="http://www.perma-tune.com/Technical%20Support/Ignition%20Modules/Porsche/993.htm" target="_blank">http://www.perma-tune.com/Technical%20Support/Ignition%20Modules/Porsche/993.htm</a>
06-26-2003, 03:27 PM
#6
RL Technical Advisor
Gents:
FWIW, You should NOT be seeing any glow or evidence of arcing around the coil and ignitor units. This is a failure of some insulation and dielectric material and should be replaced.
One doesn't usually see any CE lights from that.
FWIW, You should NOT be seeing any glow or evidence of arcing around the coil and ignitor units. This is a failure of some insulation and dielectric material and should be replaced.
One doesn't usually see any CE lights from that.
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06-26-2003, 10:36 PM
#8
RL Technical Advisor
Jorge:
Misfires can be caused by:
1) Bad plug wires & plug connectors (quite common)
2) Bad caps & rotors
3) Arcing as described above
4) Bosch platinum plugs; I use the Bosch FR5DTC
5) Vacuum leaks
6) Dirty fuel injectors
Hope this helps,
Misfires can be caused by:
1) Bad plug wires & plug connectors (quite common)
2) Bad caps & rotors
3) Arcing as described above
4) Bosch platinum plugs; I use the Bosch FR5DTC
5) Vacuum leaks
6) Dirty fuel injectors
Hope this helps,
06-26-2003, 10:40 PM
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Steve I have changed or check all of the following above (mainly changed) except for the vacuum leak and the injectors...I would think a fuel additve would help the injectors but not sure how to check for leaks..My CEL codes are so random and they just dont make any sence. It is always random misfire but there is no rhyme or reason to it at all...any advice on this one??
06-27-2003, 12:57 PM
#10
Steve, Platinum plugs cause misfires? What’s up with that? Is the resistance just so high that the juice follows another path of less resistance? I have the FR5DTC’s, but have wondered it platinum plugs might be a little better towards the end of the 30,000 mile replacement interval.
96P993, I seem to recall the “random misfire” CEL is somehow related to the carbon build up problem in the exhaust ports.
Tom
’95 993
96P993, I seem to recall the “random misfire” CEL is somehow related to the carbon build up problem in the exhaust ports.
Tom
’95 993
