Mattsx300

Hi Richard, yes these cars seem to be sensitive to battery's. I took it to a Jaguar specialist, and it turned out to be a spiked ECU and the oxygen sensors, as it was over fuelling by over 10% of what it should be.Thanks for your input anyway, Matthew

I still haven't fixed this problem, but i plugged in an OBD reader, where there was only one fault- p1626 something to do with immobliser code wrong or something. But i read the live data and noticed when up to running temperature, it says Fuel system 1 is still running Open loop - Fault I also noticed the MAF g/ps looks a bit low? Live Data Numbers of DTCs 1 Fuel system 1 statusOL-Fault Fuel System 2 statusCL Calculated Load Value(%)23.9 Engine Coolant Temperature(°C)85 Short Term Fuel Trim -Bank 1(%)0.0 Long Term Fuel Trim - Bank 1(%)-8.6 Short Term Fuel Trim -Bank 2(%)24.2 Long Term Fuel Trim - Bank 2(%)-8.6 Engine RPM(rpm) 720 Vehicle Speed Sensor(km/h)0 Ignition Timing Advanece for #1 Cylinder(°)19.5 Intake Air Temperature(°C)32 Air Flow Rate from Mass Air Flow Sensor(g/s)0.05 Absolute Throttle Position(%)12.2 Commanded Secondary Air StatusOFF Location of Oxygen SensorsB1S1---B2S1--- Oxygen Sensor Output Voltage Bank 1-Sensor 1(V)0.055 Short Term Fuel Trim Bank 1-Sensor 1(%)0.0 Oxygen Sensor Output Voltage Bank 2-Sensor 1(V)0.050 Short Term Fuel Trim Bank 2-Sensor 1(%)24.2 OBD requirements to which vehicle is designedOBDII

Ok, Thanks for you help, I will try just nipping up the bolts before I start replacing seals then. Do you know which spark plugs these engines like best? I haven't had the old plugs out yet so I don't know what's in there now. Thanks Matthew

Hi Frank, i have read somewhere that it could possibly be the oil from the cam cover leaking through? I don't think it runs badly enough to make me think that a cylinder isn't firing, but could the oil have damaged the coil pack, and possibly creating a weak spark and therefore misfiring? Matthew

I've been trying to solve the slight misfire at idle that my 3.2 x300 has, So i took the ignition coils out, and found the the first spark plug on cylinder 1(or whichever cylinder is closest to the front of the car) was sitting in oil. Obviously this shouldn't be like this, by how has the oil got there, and could this be causing my misfire? Thanks for your help, Matthew

Thanks Joe, its the 3.2 AJ16 i have unplugged each coil in turn, and it runs worse with each one unplugged so the coils are fine. I will have a look at the throttle body. could there be a possibility of an air leak? AS a while ago i took apart the air intake up to the throttle body to clean it all, so maybe it didnt like that? But as you say i will probably have to plug in the computer, Matthew

I have now encountered my first problem with this car, I drove about half a mile and stopped at a junction, but i noticed it was running rather lumpy and was misfiring, i dismissed this and continued until i slowed to a stop for another junction where the engine just slowly cut out as i came to a stop. However it restarted fine, and accelerated away with no problem, i pulled over, and sure enough it died again. So i turned around and headed for home where i kept it rolling at the junction, where it nearly died but applying throttle made it splutter but kept it going. But otherwise, on the open road it runs perfectly and accelerates as it should .etc ,however it just runs lumpy at idle on occasion and for the first time it cutout. The car has only done 67k miles so surly the crank position sensor shouldn't be a problem yet? And i don't know if this makes any difference but i unplugged the intake temp sensor and it made no difference to it running, so is that possibly to fault? Any help would be appreciated, Matthew

Hi everyone, I'm a new member in the Devon/Dorset area, and I've just bought myself a lovely X300 XJ6 3.2 Executive with only 67k miles and is immaculate. Believe it or not, i'm only 17 (not my first car though) and the insurance surprisingly is affordable! I'm no stranger to Jaguars though, as my dad has owned an X350 and currently has a new XF, so i understand and respect what Jaguars are about. I've already replaced the dimple wheels with these 17" Gemini's which are from an XK8 i think? I'm sure i'll be asking lots of questions as the niggles arrive, Matthew