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Testing coils? PROBLEM SOLVED.

 
Old 10-11-2007, 07:43 PM
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SPIKES
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Default Testing coils? PROBLEM SOLVED.

been asking this question and have not had a response. searched the forums as well.
is there a way to check the coils for the spark plugs?
anybody know what plug lead resistance should be?
thanks for any insight.

Last edited by SPIKES; 10-13-2007 at 02:39 PM.
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Old 10-12-2007, 06:21 PM
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from the lack of response i assume nobody can relate....
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Old 10-12-2007, 06:25 PM
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Try a PM to Jason Andreas or Steve Weiner. Both are long time Porsche techs on this forum. One of them will know the answer.
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Old 10-12-2007, 06:45 PM
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Originally Posted by Land Jet View Post
Try a PM to Jason Andreas or Steve Weiner. Both are long time Porsche techs on this forum. One of them will know the answer.
thanks for the response...i will try that.
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Old 10-12-2007, 06:58 PM
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Plug wire resistance should be about 3kOhm end to end
Not sure of a good coil test for these cars but there are loads of threads on problems in the area it sounds like you are troubleshooting.
https://rennlist.com/forums/showthre...ferrerid=35947

By the way, what is the problem?
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Old 10-12-2007, 07:18 PM
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Originally Posted by MarkD View Post
By the way, what is the problem?
thanks mark
new plugs/rotors/dist caps...clean isv...no vacuum leaks...
car idles at 800 but seems to "rock"

when i checked the coils it seems to splutter on one coil while other is smooth.
belt is fine....i want to test it so i can eliminate the coils.
car runs and power delivery is fine.
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Old 10-12-2007, 07:25 PM
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Did the problem start after you replaced parts or were they replaced in attempts to fix?
When did the problem begin? Anything worth noting when first noticed?
How many miles on the plug wires? (take a look at night, check for arching)
Firing order correct after caps replaced? (basic I know, but double check!)
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Old 10-12-2007, 07:49 PM
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Originally Posted by MarkD View Post
Did the problem start after you replaced parts or were they replaced in attempts to fix? ATTEMPTED TO FIX PLUS CAR NEEDED 30K SERVICE
When did the problem begin? Anything worth noting when first noticed?
How many miles on the plug wires? (take a look at night, check for arching) 29K
Firing order correct after caps replaced? (basic I know, but double check!) GOOD POINT....I AM CHECKING THAT NEXT
answered questions within quote.
thanks
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Old 10-12-2007, 07:55 PM
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If it 'sputters' on one coil and not on the other, switch the coil to dist leads to see if the sputter stays with the coil ... or the dist. head. If the latter, it could be a rotor or cap - if the former, either a coil wire or coil.
I'd have to check, but think that the coil primary leads can also be switched, to repeat the cycle.

Saying this presumes that all these tests are for running on 1 coil, 6 plugs - if I grasp what you were doing.
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Old 10-12-2007, 09:08 PM
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I'd be curious to know some troubleshooting guidelines for the coils as well. I bought my car a few months ago with 84K on the odo and this is one of those things that I'd like check, just for peace of mind.
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Old 10-12-2007, 09:16 PM
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Originally Posted by Garth S View Post
If it 'sputters' on one coil and not on the other, switch the coil to dist leads to see if the sputter stays with the coil ... or the dist. head. If the latter, it could be a rotor or cap - if the former, either a coil wire or coil.
I'd have to check, but think that the coil primary leads can also be switched, to repeat the cycle.

Saying this presumes that all these tests are for running on 1 coil, 6 plugs - if I grasp what you were doing.

thanks...i will try it.
noah.....i am sure there has to be some reliable "test" to check the coils.
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Old 10-13-2007, 02:35 PM
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thanks markd and garths for helping........
i started checking the coils again today and found that both coils are good on secondary rotor but bad on the primary...car splutters badly on it.

i double checked the firing order and tdc and then checked the firing order AGAIN and found 2 plug wires were switched
i am so relieved and feel a bit stupid by not finding this sooner....
anyway thanks for your efforts.
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Old 10-13-2007, 07:06 PM
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All's well that ends well.
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Old 10-13-2007, 07:21 PM
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Great!

It's usually the simple things that get ya.
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