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Testing Ignition coil

bigalpha

bigalpha

Moderator
Location
Tucson, AZ
How do you test the ignition coil (88 MJ)? I am getting yellow-orange spark to the plugs and want to see if the ignition coil is fubar.

I found the following page but am not sure if it's applicable to the ignition module in the XJ. More specifically, these two pictures:

coil%20test%20primary%20windings.jpg


coil%20test%20sec%20windings.jpg


http://www.volvoforumsrepairs.org.uk/300Repairs/300renix.htm
 
Lets play a game.

You pretend that you are the only one that knows what year/engine, etc., that you are asking about.

We will all pretend you never asked a question until you provide at least the bare minimum of information about your vehicle.
 
88 MJ with 6cyl.

edit: is the ignition system on the 2.5L the same as the 4.0L?
 
Last edited:
orange said:
Joe Peters, C.E.

has a nice ring to it!

:D
Click to expand...

Those that really get to know me just call me A**hole, but they smile when they say it! :D
 
OP-
Ohm it with a meter. BUT that does not always show breakdowns at high voltage. Best bet is to swap in another one and retest. A salvage yard probably a good source.
Assuming it's is getting good volts and ground inputs.

Regards,
Orange
 
Page down to bottom of this thread page for several threads about ign. coil testing. Those threads will have more threads at bottom usually.
 
For an 88, if memory serves me correctly, you also have an ignition control module that is involved along with the coil itself. They are connected together but can be serviced separately.
 
orange said:
OP-
Ohm it with a meter. BUT that does not always show breakdowns at high voltage. Best bet is to swap in another one and retest. A salvage yard probably a good source.
Assuming it's is getting good volts and ground inputs.

Regards,
Orange
Click to expand...

Well, the current I.C. ohmed at .8/.7 for the primary coil so it's almost bad.

birchlakeXJ said:
For an 88, if memory serves me correctly, you also have an ignition control module that is involved along with the coil itself. They are connected together but can be serviced separately.
Click to expand...

Yes, this is true. Part of the troubleshooting is testing the connectors.
 
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