XJS ( X27 ) 1975 - 1996 3.6 4.0 5.3 6.0

91 XJS 1 coil failed

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Old 07-07-2014, 09:12 PM
mkinn's Avatar
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Default 91 XJS 1 coil failed

Ran fine until this evening, lost major power and backfires. Strong unburned fuel/air mixture on Driver's side exhaust, other side normal.
Removing the top coil wire at distributor made no difference. Held that coil wire up to a ground, and it has a very small, weak spark. Took other coil wire off, VERY STRONG spark, shocked me and of course, engine dies.
I have 13.5 V at one side of the coil, and it reads 1.2 ohms. Is this just a bad coil, where should I get one, and if not, how does one troubleshoot the ignition modules?

I read the Kirby Palm book where it says don't run the car AT ALL until it's fixed, because the unburned fuel will cause a fire, or heat will destroy the catalytic converters in minutes.
 

Last edited by mkinn; 07-07-2014 at 11:51 PM. Reason: added measurements
  #2  
Old 07-08-2014, 09:10 AM
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If it turns out you need a coil, a couple of week ago I bought this,
Amazon.com: Standard Motor Products UF136 Ignition Coil: Automotive Amazon.com: Standard Motor Products UF136 Ignition Coil: Automotive

I haven't had the chance to put it to much use yet, but it's made in Italy, just like the originals I replaced.
 
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