Having problems with your 2003 Jaguar S-Type ?

I have a 2001 Jaguar S-type 4.0. I have had a check engine problem for a few weeks now. It was initially a misfire on cylinder 3. Mechanic changed ignition coil. After a few days, check engine light on again. This time misfire on cylinder 4. He changed all the spark plugs and tied together some loose cables. Check engine still there. Still on cylinder 4. Another mechanic found right side valve cover gasket leaking. He changed gasket and applied spark plug seal. Check engine came on within 15 min

Posted / edited by AnonymousUser on : 22-07-2019

Answers :

Mechanic will get back to you because he doesnt know ,and neither do i to be truthful but the only way i can out of this problem is to use the right software and i mean take it to the dealers and have it hooked up and put right .This could be a ECU fault hence the misfire on the different cylinders ,i have a 94 4lt sovereign with the white leather interior ,and what a tool but i love it evan better doing the odd wedding and posing in this car ,when mine plays up i give it an extra clean and polish ,and leather treatment then it take pity on me and works again.But in all seriousness i would suggest the jaguar agent ,becaues like myself your local mechanics are doing a great job but ??when a mechanic hits "encrypted software " then he says he will get back to you ,after hes spoke to his mates to see if they have had a similar problem and what part needs to be changed ,we do it here in the "pueblo" FRom the description you have given ??its sounds like the fault could be ECU where it counts the cycles from the pick up and its out of sync with the firing order.If it is this and new is so expensive then find a smashed up one in scrapyard and remove the ECU and the chip from the key and fit them to yours ,or old favourite trade it in and give someone else the headache
I think the problem may be with the ignition coils or possibly a vacuum\015\012leak from the lower breather elbow under the intake manifold. FIrst\015\012listen for a hising noise in the rear of the engine while the engine is\015\012idling. If you hear it then I suspect the elbow is leaking. If no noise\015\012is heard then it'smost likely a coil. They are usually difficult to\015\012pinpoint without a power balance test on a diagnostic tool. You may get\015\012lucky and there may be a fault code logged pinpointing you to a\015\012particular cylinder. I recommend you go to your local parts store or\015\012autozone and have them scan for codes. They will usually do this for\015\012you at no charge. Once you have the code numbers let me know what they\015\012are. If it's a cylinder missfire code (P0301 Cylinder 1) then I suspect\015\012a bad coil.
Repair Help & Product Troubleshooting for 2003 Jaguar S-Type

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