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big doubt on battery voltage. these cars are not sensitive in any way, i once drove an s-type with a busted alternator for 3 hours. you have to drop under 11.8 while running to get a christmas tree and weird stuff happening
Good info about the ECM update in 2006. There are definitely no misfire counters in my 2003 V6 ECM. I tried SDD/IDS (dealer-level Jaguar software), iCarSoft, numerous OBD2 scanners and even a borrowed professional TOPDON scan tool. Nada. No misfire counters.Originally Posted by xalty
there is no misfire counter until the PanPAG ECM came out in 06.big doubt on battery voltage. these cars are not sensitive in any way, i once drove an s-type with a busted alternator for 3 hours. you have to drop under 11.8 while running to get a christmas tree and weird stuff happening
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Good for you but that was on the V8. No such luck on pre-2006 V6s.Originally Posted by Catmobile
I had a similar problem with my car five years ago, or something. I took the car to a local mechanic and with his portable Snap On device he was able to check the car out in real time while I drove around and was able to pinpoint the problem pretty quickly. It didn't cost very much for him to do it and the problem was a pretty easy fix. It seems much better than buying a bunch of equipment that you don't have experience with. the Snap On device is probably more sophisticated than most too.
To conclude this thread, I've been daily driving my 2003 S-Type V6 manual for 2 weeks now with a fully charged battery and the misfires are completely gone. I've made it a habit to put a charger on my battery twice per week to keep it fully charged. I do have some parastic draw. The car draws 0.6A even when sleeping (several hours after shutdown). I think this was contributing to the battery state of charge being low and caused the persistent low-RPM misfires.
JagV8
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That's a BIG power drain. Worth fixing!
Excellent outcome. Way to stick with it. I learned a lot about v6 vs v8 in this thread. Thanks for posting the data and conclusions