Thank you in advance for helping me diagnose this! 2011 XJL 5.0 N/A 84k miles.

My wife was driving down the highway going up a hill and got a restricted performance warning. Pulled over immediately and turned off the car. The car would not restart with a couple attempts.

I towed it to the house and it sat for over 1 day. I tried to restart it and got a click and it turned out that the 400a starter fuse was blown. Replaced the mega fuse and it will restart without any issue.

Working theory is that cylinder 4 (or maybe 2) fuel injector stuck open causing the restricted performance...it couldn't be restarted because too much fuel in the cylinders...which caused too much cranking which blew the starter fuse...sat for a day and cleared that excess fuel out. Restarts fine after the fuse was replaced.

Cylinder misfire codes on cylinder 2,4,6. When I first read the codes it was just cylinder 4 and 6 and then 2 got added recently.

There is a LOT of fuel leaking into the exhaust...it is collecting at the exhaust junctions on the same side as the misfires are on the same side as the misfires. The main engine ground looks ok, there is a small discoloration (oxidation) towards the lower end but not bad at all. There do not appear to be any frayed wires anywhere. There is definitely a slight gas smell in the oil so I am trying to run it as little as possible while I collect data.

Here are all the results from the scan tool.
-absolute load: 35.686% -minor fluctuations
-absolute throttle position 19.216% -steady
-absolute throttle position B 35.294% -minor fluctuations
-accelerator pedal position D 15.294% -steady
-accelerator pedal position E 7.451% -steady
-air flow rate from mass air flow sensor 23.150 g/s-minor fluctuations
-ambient air temperature sensor 4 degrees c -steady
-barometric pressure 100kpa -steady
-calculated load value 39.608% to 41.9% - mild fluctuations
-catalyst temperature bank 1 sensor 371 - rising
-catalyst temperature bank 2 sensor 371 - rising
-commanded evaporative purge - 0%
-commanded throttle actuator control 28.627% -minor fluctuations
-control module voltage 14.102v -minor fluctuations
-distance travelled since DTCs cleared 0km
-distance travelled while MIL is activated 0km
-engine coolant temperature 15 degrees c
-engine RPM 1334.75 - minor fluctuations
-equivalence ratio (lambda) (B1-S1) 1.00 - dropping to around .8 and minor fluctuations after
-equivalence ratio (lambda) (B2-S1) 1.00 - dropping faster than B1 but holding at about .8
-fuel level input 29.804% -steady
-fuel rail pressure 14310 kPa at start then 17 seconds in drops to about 3500kpa and stays steady
-fuel system 1 status - start OL then 9 seconds in changes to OL-fault
-fuel system 2 status - start OL then 8 seconds in changes to OL-fault
-fuel air commanded equivalence ratio 1.049 to 1.00 - minor fluctuations
-ignition timing advance for cyl #1 -bounces around for 0.50-1.5 BTDC until 18 seconds in -change to 5 BTDC then 36.5 BTDC then stablizes around 12-16 BTDC with minor fluctuations
-intake air temperature 15 degrees c
-intake manifold absolute pressure 49 kpa starts dropping at 18 second mark and stabilizes at -about 30 kPa with minor fluctuations
-location of oxygen sensors B1:S12 / B2: 12
-long term fuel trim bank 1 0% -steady
-long term fuel trim bank 2 0% -steady
-long term secondary 02 sensor fuel trim bank 1 - 0% -steady
-long term secondary 02 sensor fuel trim bank 2 - 0% -steady
-malfunction indicator lamp (MIL) status OFF
-number of warm ups since DTC cleared 0
-OBD requirements OBD and OBDII
-oxygen sensor current B1-S1 - starts at 0 and gets up to -.0457 @ 11 seconds and fluctuates until it stabilizes at -0.609mA @ 20 seconds
-oxygen sensor current B2-S1- starts at 0 and gets up to -.0609 @ 15 seconds and fluctuates until it stabilizes at -0.609mA @ 20 seconds
-oxygen sensor output voltage B1S2 - 0v until 12 seconds then continues to climb until end of recording at 44 seconds at 0.465v
-oxygen sensor output voltage B2S2 - 0v until 28 seconds then continues to climb until end of recording at 44 seconds at 0.045v
-relative throttle position 7.5% to 3.137% over 44 seconds
-short term fuel trim bank 1 0% -steady
-short term fuel trim bank 2 0% -steady
-short term fuel trim B1S2 0% -steady
-short term fuel trim B2S2 0% -steady
-short term secondary 02 sensor fuel trim bank 1 0%
-short term secondary 02 sensor fuel trim bank 2 0%
-time since engine start 0
-vehicle speed sensor 0km/h

 

where is the main starter fuse located

 

In the trunk underneath the plastic panel that covers the latch, inside a black plastic panel that needs to be removed...just trace the positive terminal from the battery and it goes straight there.

 

It can happen that an injector fails open. Start it and then turn it off, ignition back on but not running. Monitor your fuel rail pressure, it should not drop. If it goes down, you have an injector leak. Next best step is pulling the plug on the affected/suspected cylinders and checking with a borescope. Can often see them dripping.

 

Pretty much what happened to my car. Change ALL 4 injectors on that side of the engine. Even numbers are the drivers side and odd numbers are the passenger side. Watch out for counterfeit injectors as I got caught on that and spent a miserable 2 weeks doing all kinds of things trying to fix it. Since your there I would add a spark plug change (all 8) as well.

Did the car put out clouds of white smoke?
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