Can I Fix the Misfire on my Daily Driver XJ6?
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- เผยแพร่เมื่อ 11 พ.ย. 2022
- My daily driver 1975 Jaguar XJ6 has had a slight misfire for a while which has gotten worse. Let's investigate what it can be. Can I fix the misfire on my daily driver XJ6?
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Hi Adam . Well your daughter isn't camera shy ! 😁😁 lt's high time we saw you working on one of your's ! Take care .
She’s not shy haha
Yes it’s great to be working on one of mine again
Did you realise that nobody was listening to your opening segment but EVERYONE was laughing at your hilarious daughter! V cute!
I had no idea she was making faces to the camera until I edited it the next day
Hi Adam, thanks for the down to earth content. I find it easy to follow what you're doing and your logic. I just want to share my real life experience with electronic ignitions. I have used both Pertronix and 123 in my Series 2 E Type and Lotus Elan Plus 2. Obviously they remove the need to adjust and maintain the old points which is a reliability improvement.
But my experience in daily use is that both brands are unreliable. I have had five module failures. Some were like your symptoms showing when the engine warms up. Others just died instantaneously.
My theory is that these relatively low volume electronics manufacturers are not quality testing through hundreds of heat cycles like an OEM would. If you drive your classic once a month like most people, they do appear reliable lasting for years. If the car is your main transport, failures are regular.
Depending on the location of your distributor its easy enough to carry a spare and change it road-side. Not the case with the Lotus twin cam. You can't even see the distributor :)
Glad you like the content, thank you!
I hope the one I got works well. I will be testing it in a daily driver which will really test it in all weathers.
I recall about 50 years ago my dad had a similar misfire problem with his Series III Land Rover that only occurred when the engine was hot and disappeared when it cooled down. The ignition circuits all checked out to be perfect. Somewhat bizarrely he eventually found a hairline crack in the exhaust manifold and replacement solved the problem. If your problem is on all cylinders that's unlikely to be case but if it's only on the bank of 3 cylinders served by a manifold it might be worth a look at the related manifold or it might be the coil.
Great idea to check the exhaust too. It has a slight leak when cold and that is getting sorted soon.
Hey Adam, allow me to share the summary of 1000hrs misfire gremlin chasing in my daily driven 420.
1- Vacuum leaks. If it gets worse with heat id start by putting a vacuum pump on the brake booster and heater control take offs and see if they hold vacuum. Issues here will show as misfiring at idle but it will run fine under load. Even the smallest leak will show symptoms like you have. Auto cars hide it better because you can load up on the converter.
2- Fuel quality. If you are running a 7L engine, try lower octane fuel. I run 91ULP in Australia and idle/spark plug colour improved immeasurably over 98ULP.
3-Advance curve. I use a 123 tune+ also and love it. Try setting to 0deg static then immediately bumping to 12-13deg btdc once it reaches 500rpm. Youll be amazed how buttery start up is, and how stable the idle is. Adjust timing for highest/crispest idle. I run 34deg all in @ 3600. Modern fuels allow this. Knock will come in on part throttle so be sensible on the vac advance.
4- Spark plug heat range. Try running a hotter plug, im on champion N11YCs but N13s are doable in this engine.
My car ticked over 10k miles in a year and runs perfectly. Ran like a dog when I got it. Big fan of your channel and Ive made a few videos myself to address these problems, especially the vacuum leaks. Good luck!
Thanks for all the suggestions!
Woah this is gold
Those 123i ignitions do work well to make a reliable electronic set up , providing all is well mechanically, they can make for smoother running. I’ve heard a few singing their praises, Adam, so best of luck hope works well for you too
So far it seems to be a good bit of kit. I’m looking forward to testing it long term
Cool. Looking forward to the 123 test.
Thanks Jeff!
@@LivingWithAClassic I watched your early showing...great video. On the follow-up, share where you got the information to set the dizzy.
Such a beneficial channel !
I’m glad you like it!
Hi Adam, big fan of your channel. Your head gasket videos will certainly help me as my 85 S3 VDP has a terrible missfire and head gasket leak. The one worry is head studs and the block sticking. I also hope my pistong are fine. All the best!
I hope all goes well with your head gasket change!
Hi Adam good content as usual esp your daughter, here is a simple tip when searching for that mysterious miss on an idling engine. Do this check at night when its dark, start up then carefully visually check all the ignition system, looking for any arcing, easy to spot when its dark. Although in this case I think its your ignition module as well. I admire your dedication.
Yes that too is great. However in this case the wires were all pretty good but the system was the issue. Runs much better now with a new distributor
ignition wires will fail (i.e short to the engine block) more readily when warm than cold. including the one from the center of the coil to the center of the distributor.
although, i see that that was not the case here.
I had one years ago - an old BMW six - that had an incurable misfire despite having nothing actually wrong with it. The problem was plug leads arcing against each other as they had been cable tied up to keep them neat. I cut the cable ties off, cleaned the leads up - cured.
Good simple fix there
if you want to optimise the ignition i suggest switching to equivalent iridium spark plugs. They stay gapped perfectly for longer because they are so much more hard wearing then conventional copper sparkplugs. And the iridium is also very conductive so more energy from the coil is used to make the actual spark. A more energetic spark creates a completer burn.
in my series3 i have also noticed that low battery voltage also has a noticeable adverse effect on ignition, specially at idle.
Yes low battery voltage does do a lot of harm to the ignition.
I’ve had bad luck with those types of plugs but I may try them again
The new ignition module will be a great upgrade. I guess it might be a bad solder in the electronic. It makes contact more or less depending on the temperature. (Just like the cheapo led light bulbs; they almost all fail this way)
It’s a great upgrade so far
I was also trying to diagnose a misfire on my X-type recently and made an ignition coil tester. I plan to publish the video of making this tool soon.
I hope you find the issue
@@LivingWithAClassic Yes, with an X-type the reason is clear: gasket seal rings of the intake manifold.
what ngk do you use, bp..ey or es?
BP6ES
Hi，Adam. Great video! Do you like the TOPDON BT300P? I didn't receive your email.
Yes it works great! The filming is now done and I will edit it. Just sent you an email also.
what does the Bluetooth do?
It helps you change the ignition mapping without getting your fingers dirty turning a switch.
Yes and much more. You can fully customize everything
@@LivingWithAClassic I assume this is the 123+. Does it work with or mimic vacuum advance?
Slightly bored daughter 😅
Just a bit 😂
@@LivingWithAClassic the horse was quiet though ;-)