Coming back from a two-day road rally event, car had been driving flawless like always. I am very good about always using premium gas, always using BK44 on every oil change in the fuel to clean injectors and using GDI intake cleaner as well. I keep up with all maintenance like you should.

Stopped for gas in the morning on the ride back, topped of gas (had about half a tank) local Shell station 93. About an hour later, some of the others I was with stopped again for fuel (the E85 guys who need gas more frequently), so I decided to top off. This time BP station, again 93. When starting the car back up, it immediately started to shutter and misfire. Car had been completely fine. I checked gas cap, restarted the car. Still idling rough and misfiring. No code reader with me, I decided to see if I drove it, would it clear, stop, whatever. Immediately I got a flashing yellow check engine light. I knew not to drive it, so I pulled over. Turned car off. Let it sit for a minute, started back up and flashing yellow check engine is now solid. Drove it to the next exit, again with a strong misfire.

I put some fuel injector cleaner into the gas. Let it sit for about 10 minutes and started again and attempted to drive it home. Still missing, but not as bad, but driving rough. Check engine light still solid. I nursed it home at a ridiculously slow speed.

Got home and pulled codes. P0300, P0306, P1315. Misfire on cylinder 6, random misfire detected and persistent misfire catalytic converter damage. I took out cover and looked on drivers side (3 bank back with is #6), everything seemed plugged in, so I reset codes and restarted engine to see what would come back. Immediately same codes came back except this time also with P02F3 - Cylinder 6 injector circut, range/performance. Figuring the plug and ignition coil are probably okay (didn't try to switch them around) I was convinced my injector crapped the bed. I spoke with a local Jag specialist who concurred it was most likely, but could still be something with the plug/coil.

I was frustrated and done for the day. Decided to look more into today (this was yesterday). Today I started car to at least back out of garage to wash the car from the rally and car started up just fine. No miss. No rough idle, just like normal. Car is stage 3 tuned by Velocity AP with their 200 cel downpipes. I let the car warm up, took out for about a 10-minute spirited drive and everything seems like nothing happened. Ran code reader, free and clear. No codes.

I am pretty stumped to be honest. Could be an intermittent issue with the injector I suppose but could it be the ECU freaked out and just shut down cylinder 6 to try and protect itself when it detected a misfire and once it had time to cool down, hibernate and sleep it randomly resets itself? I plan to change the oil out this week in case it dumped a ton of fuel into the oil (even though it is not due) to be on the safe side.

Anyone have any sort of similar experience? Suggestions? I spoke with the independent shop and he said its possible either the coil or injector wire harness was partially loose and when I reseated cables it resolved it, but that seems unlikely to me. Right now car is running fine. I put some whatever brand fuel injector cleaner in the gas when I was stuck, so I will need to burn that off and then redo my normal BK44 treatment (I don't want to mix the two). Probably will do the injector cleaner as well while I am about to do the oil change.

 

Could be some bad luck with gas? I had a Stage 1 tuned C43 Wagon that had misfire come on completely randomly one evening. Took it to my tuner the next day and CEL cleared on 3rd or 4th restart and ran without a hitch. He went over every inch and couldn't find a thing. He figured it was just a bad bit of gas that the tune didn't like..and i always put 93/94 in that thing too.

 

your injector could be on its way out ,but it could be some bad gas

 

@skizot There may have been some particulates in the gas you bought at the second station that jammed the nozzle, but later cleared (thank goodness).

I learned a lesson not to fill up while the supply truck was at the station at the same time stirring up the particles in the main tank. A few minutes later one injector seized down the road in my Audi A4, but did not clear unfortunately and had to be replaced.

This also happened to someone who used some old gas in a 5 gallon plastic container for their generator and lawn mower and didn't want to waste it - injector also seized right after.

What is interesting is all the codes thrown when that happens! Glad you are back to normal

 

Could also be a chunk of carbon from the intake valve broke off like what happened to @OzXFR :

https://www.jaguarforums.com/forum/x...4/#post2182794

 

@Tuning@VelocityAP Chris would love to get your input on this when you have a minute.

 

It was literally when I restarted the car, while still sitting at the pump. It instantly started to misfire. So I don't think it could have been fuel, maybe coincidence that I had just topped off, but the fuel that would have been just put into the tank would not have even had time yet to get to the injectors or mix with the existing fuel. I mean it could have been the previous fuel I put in at the stop before, but the car was driving fine the entire time. Was not until I turned off, topped off and then restarted and instantly was running rough. I did remove the plastic/rubber cover to check the connections of the injectors and plug coils to see if somehow one was loose, perhaps it was and reseated. I do drive the car pretty hard, maybe vibrations on a loose connection, but still very odd behavior.

 

Update, pretty certain cylinder 6 injector was stuck closed or the ECU shut down cylinder 6 because it detected a misfire. It wasn't until the car had the codes reset, driven again and sat to reset itself. Car is still running pretty normal at the moment. I plan to burn off the fuel left in the car, run some GDI cleaner this week, change the oil to be on the safe side and most likely order a set of injectors to get done on the car. Came across this thread, which has been super helpful: HOW-TO: Injector Removal Step-By-Step - Jaguar Forums - Jaguar Enthusiasts Forum

 

@skizot Thanks for the update. Good idea on the injectors as it is a matter of when, not if, they will fail. Watch out for counterfeits though, just ask @clubairth1 and @jaguar V6 japan:

http://www.jaguarforums.com/forum/f-...5/#post2795325

https://www.jaguarforums.com/forum/f...isfire-285580/

I recently purchased a new set just to have on hand for such an occurrence but cracked open the boxes to confirm they are the real deal Bosch just in case.

 

You are smart to take a look BEFORE you need to install them!
I would not wish the 2 weeks of Hell I went thru before I figured out the injector problem on anyone!
I thought I knew what I was doing but got bit very badly with the counterfeit parts.
.
.
.

 

I bought my injectors from Rock Auto, Bosch, showed equivelant Jag part #

 

Parts provided by Rock Auto can be trusted...assuming that the cross-reference is accurate.

I use AC Delco oil filters from RA.