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  #9  
Old 06-09-2017
awg  awg is offline
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Quote:
Originally Posted by tazwegion View Post
I pulled the ignition coil out of the XJ because I'd pretty much eliminated every other likely cause of the irregular/infrequent misfire, the engine would start and run for ages without a "hiccup" then as it approached normal operating temperature 90~100c the surging/chugging at light load would begin & disappear under hard acceleration only to reappear on light engine loading...

After cleaning up the unit it became apparent all was not well, it had developed at least 4 significant cracks in the casing (see pictures below) and on further investigation a notable increase in the resistance between the primary terminal pins (above specification) was evident

Now I know Bosch make nice GT40R coils for both points and electronic type ignitions (but not apparently for the Jeep) has anyone tried an MSD #8228 coil OR perhaps recommend something else I wont need to get from the Official Jeep Stealerships?
looks like i got lucky, as my coil replacement has cured my problem.

reason I resurrected this old thread is when I did a search on "Ignition Coil", ( should have checked before hey), this was the first one that addressed the issue, and the description is EXACTLY what mine did

the used replacement I had to hand is very much cracked, far worse than the one that came off, so I ordered this for $47 (reduced from $90)

http://www.ebay.com.au/itm/IGNITION-...QAAMXQVERS~EGx

I have noticed a few things;

* much more power
* smoother idle
* operates at correct temp...previously it has run at low temp

I have a digital temp gauge, so I know exactly temp is, was consistently running at 74-84C, and within 5 minutes of replacing coil, it now runs in the range one would expect 90-100 (it used to run at that temp before problem arose)

The most logical explanation I can put for the above is a crook coil must either induce low combustion temps and/or cause the computer to make timing adjustments that rob power, and probably fuel economy

bottom line is if you have any issue that feels like a miss, stumble or hiccup, especially associated with low running temp
replace the coil, its easier and cheaper than most other items
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Last edited by awg; 06-09-2017 at 06:44 PM.
  #10  
Old 06-09-2017
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for the record, last I got a coil from the Dealer was like $75.
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  #11  
Old 12-09-2017
awg  awg is offline
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good thing i ordered a new Goss coil, as the cracked old spare one i used began to play up after few days.

It hot in there, bolted to the block, I wonder whether relocating the coil a bit cooler would be worthwhile
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  #12  
Old 12-09-2017
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Quote:
Originally Posted by awg View Post
good thing i ordered a new Goss coil, as the cracked old spare one i used began to play up after few days.

It hot in there, bolted to the block, I wonder whether relocating the coil a bit cooler would be worthwhile
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  #13  
Old 12-09-2017
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  #14  
Old 13-09-2017
awg  awg is offline
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Quote:
Originally Posted by rainman View Post
noice..my old one is now wired in against the engine mount with 1mm wire, just in case of catastrophic failure

XJ coil will run without being earthed to anything


had a coil fail today on an old Jag, luckily carried a spare

did Mrs commy spark plugs while back, so 3 is enough
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