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Old 11-10-2003, 04:31 PM
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Join Date: Apr 2001
Location: fort worth
Posts: 363
is there a way to test the coil?

At our clubs tech session on Sat one of the techs pointed out a slight greyish are on my 87 300Ecoil(320K miles) and said that the coil had gotten hot at some point. He rec changing the coil. Is there a way to test it? Also when searching under coil I noted other than OE coils eg Jensen. Do I want/ need them and do they fit well?

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Old 11-11-2003, 10:48 PM
Registered User
Join Date: Apr 2001
Location: fort worth
Posts: 363
Hello re coil advice

I must have posted at a bad time. Any way to test the coil? I was told my coil has a grey discolored area from getting too hot/having too much resistance at one time. How do I see if I need to replace the coil? could the excess resistance come from having the plug gaps worn to 35 or 40 from 30?
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Old 11-11-2003, 11:58 PM
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Join Date: Jan 2003
Location: Sydney, Australia
Posts: 627
Unless the coil is still running very hot, getting visibly distressed AND the car is not performing properly (eg. mis-fire, poor fuel economy, difficult starting, etc.), I would be reluctant to worry about it. I find that I can usually spend enough money replacing parts that definitely need to be replaced without worrying about any that maybe don't look quite right. I guess you need to look at what can happen if you don't replace it. I am in favour of replacing something that will cause damage or is dangerous if not replaced but all that can happen with your coil is that the car will stop.
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Old 11-12-2003, 03:13 AM
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Join Date: Jan 2001
Location: oregon
Posts: 2,013
There is a way to test them with a VOM ,but I just unplug the coil wire leading to the center of the distribtor cap and hold the end of the coil wire about an inch or so away from a good ground with a pair of insulated pliers and have someone crank the engine over with the key on, a good coil will put out a strong arc to ground a weak coil will show a yellow weak spark.............
William Rogers.........

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