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Re: S Type Jaguar 3.0 Air leak somewhere in the engine.
It sounds like the classic symptoms of air leaking into the engine after air flow sensor. check the hoses on top of the engine. Also spray detector spray around the inlet manifold this will get dragged into the engine at the leak and will make a noticeable affect on the engine note/smoothness. Leaks around the inlet manifold is quite a common fault on s type. see other posts with similar symptons earlier in jaguar fixya.
Good luck. Please let me know if you find the fault.
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sounds like classic symptoms of air leaking into engine after air meter, check air hoses to engine then when engine at idle - spray detector spray around the inlet manifold and if this is leaking at its gasket (very common problem on V6 at the rear of the engine) the engine note will change. see earlier posts with similar problems.
hope this helps - good luck.
If the car starts again without trouble - it is probably an air leak on the inlet manifold or associated pipework. If the car is very 'lumpy'' then stops it could be a coil-pack or mass airflow assembly - also this fault sometimes triggers a gearbox fault warning as the engine and gearbox become out of sync. due to engine misfires.
The air leak fault will not always register in the fault code memory of the car whilst in its early stages. As the fault becomes greater - the engine will become hesitant - then stop. This is the time to spray leak detector spray around the pipes or manifold joints, as the spray gets 'sucked' into the leak and the engine note will change noticeably.
Hope this helps - good luck.
You probably have a vacuum leak. First: Check the brake vacuum line from the air intake manifold to the brake servo (black plastic pipe running from top of engine to brake servo with flange in the middle). It may be cracked. When engine at idle listen for leaks. You can run your hand along it to try to feel sucking.
If not that lift the black platic engine cover (3 screws) and look for cracks/leaks in the 1" black house running from front cyclinder bank to air intake manifold. It may be split/sucking air.
You may need to reset the Check engine light. Good luck
yes it sounds like a vacuum leak possibly the line going to the brake booster try to start the car open the hood and listen for a hissing noise you may be able to inpoint where the leak is and fix it with a new piece of hose or a fitting