Misfire codes - what cylinder next???
#1
Misfire codes - what cylinder next???
Ive been getting various codes between 302,and 304 and the corresponding 352 and 354 with the various misfires. New battery installed, new coils, plugs and next is ignition control modules. No idea where they are mounted though. My reader says codes are for cylinders 2, and 4 but Jaguar manual says they are for cylinders 5 and 7. What is the correct cylinder numbering order, bearing in mind this is U.S. spec 2000 XKR. Codes still persisting even though all have been changed.
Misfire used to occur after about 10 miles, now occurs right on start up and goes away after around 8 miles.
Misfire used to occur after about 10 miles, now occurs right on start up and goes away after around 8 miles.
#2
I had a very similar problem that was quickly diagnosed (by member RJ237) as ECU capacitor leakage. I found a place in the UK to replace the offending units and it has completely cured the misfire. RJ recommends: Automotive Scientific Inc. | Quality Rebuilt Automotive Electronics | Rogersville, TN for US owners.
Ignition control modules are locate on the bulkhead, either side of the air intake - but it won't be them causing the misfire...
Hope this helps.
Ignition control modules are locate on the bulkhead, either side of the air intake - but it won't be them causing the misfire...
Hope this helps.
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petes76 (10-04-2016)
#4
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Mark,
Attached the cylinder numbering, or see this post by Jim Lombardi:
https://www.jaguarforums.com/forum/x...27/#post498920
Ignition modules incorporated into ECM for 2000 on; others more knowledgeable will chime in with help on the misfire.
Mike
Attached the cylinder numbering, or see this post by Jim Lombardi:
https://www.jaguarforums.com/forum/x...27/#post498920
Ignition modules incorporated into ECM for 2000 on; others more knowledgeable will chime in with help on the misfire.
Mike
Last edited by michaelh; 10-04-2016 at 04:47 PM. Reason: add link
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petes76 (10-05-2016)
#5
An ECU problem related to internals is unlikely, that was 96-97 situation. But there is a possibility that there are bent/corroded pins at the ECU.
With the battery neg. cable disconnected check the ECU plug carefully for corrosion or bent pins.
It's also possible that the injectors are the source of the problem. I don't like removing injectors, but unless someone has a better idea, try swapping the ones from the misfire cylinders with ones from the other bank.
With the battery neg. cable disconnected check the ECU plug carefully for corrosion or bent pins.
It's also possible that the injectors are the source of the problem. I don't like removing injectors, but unless someone has a better idea, try swapping the ones from the misfire cylinders with ones from the other bank.
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petes76 (10-05-2016)
#6
Ive been getting various codes between 302,and 304 and the corresponding 352 and 354 with the various misfires. New battery installed, new coils, plugs and next is ignition control modules. No idea where they are mounted though. My reader says codes are for cylinders 2, and 4 but Jaguar manual says they are for cylinders 5 and 7. What is the correct cylinder numbering order, bearing in mind this is U.S. spec 2000 XKR. Codes still persisting even though all have been changed.
Misfire used to occur after about 10 miles, now occurs right on start up and goes away after around 8 miles.
Misfire used to occur after about 10 miles, now occurs right on start up and goes away after around 8 miles.
If problems remain I think the jag codes info lists the known causes (as it does for my car) other than the coils themselves.
The following users liked this post:
petes76 (10-05-2016)
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