Electrical: - Is the coil cooked?

Jungle_Jim · Jul 27th, 2013, 16:51

Hi all

Can anyone say if my coil needs replacing:

The engine runs ok but after 20 minutes of driving (or sometimes randomly), it nearly stalls, has no power, and smells of petrol fumes as though it's flooding. Usually after a break it starts up ok again.

I'm suspecting the coil. The 'primary resistance' is coming in at exactly 1 ohm, the secondary 7.7k - these readings taken when the engine was cold.

I have an old Haynes manual, which doesn't specify for B200F engine. They list EZ-116K - and my figures are within tolarances for that, but for 'computer' or 'breakerless' systems, my coil resistances are too low, but it has to be said aren't wildly out of spec.

I'm not sure if the coil resistances would change when the engine is warm (and it's having one of these turns), but I guess that's something to check next.

Thanks
John H

240SE K/92 manual estate B200F

Stephen Edwin · Jul 28th, 2013, 17:13

I am lost re this question but I haven't seen any answers so far. It seems to me the tests you have done are positive for the coil, and can there be that much difference in values between the coils for different engines?

Can you borrow coil from a Volvo that is not suffering the problem, and see if you still have the problem with that coil fitted?

And/or, most garages have electronic test equipment for engines and that test will include the coil.

But above all, why do you suspect the coil?

Starting point is, an intermittent fault occurring when the engine reaches about full temperature?

Jul 27th, 2013, 16:51	#1
Jungle_Jim VOC Member Last Online: Apr 21st, 2024 00:39 Join Date: Sep 2009 Location: Brighton	Is the coil cooked? Hi all Can anyone say if my coil needs replacing: The engine runs ok but after 20 minutes of driving (or sometimes randomly), it nearly stalls, has no power, and smells of petrol fumes as though it's flooding. Usually after a break it starts up ok again. I'm suspecting the coil. The 'primary resistance' is coming in at exactly 1 ohm, the secondary 7.7k - these readings taken when the engine was cold. I have an old Haynes manual, which doesn't specify for B200F engine. They list EZ-116K - and my figures are within tolarances for that, but for 'computer' or 'breakerless' systems, my coil resistances are too low, but it has to be said aren't wildly out of spec. I'm not sure if the coil resistances would change when the engine is warm (and it's having one of these turns), but I guess that's something to check next. Thanks John H 240SE K/92 manual estate B200F

Jul 28th, 2013, 17:13	#2
Stephen Edwin Premier Member Last Online: Oct 26th, 2023 20:42 Join Date: Jun 2010 Location: Thurrock	I am lost re this question but I haven't seen any answers so far. It seems to me the tests you have done are positive for the coil, and can there be that much difference in values between the coils for different engines? Can you borrow coil from a Volvo that is not suffering the problem, and see if you still have the problem with that coil fitted? And/or, most garages have electronic test equipment for engines and that test will include the coil. But above all, why do you suspect the coil? Starting point is, an intermittent fault occurring when the engine reaches about full temperature?

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