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My 2002 jaguar x type 2.1 is slow to pick up speed I've changed the spark plugs the coils the O2 sensor checked for air leaks and it's still the same I've been told it could be the catalytic converter what do you think

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There are many things that could cause that problem but yes the catalytic converter can cause that as well as the muffler or resonator if the car has one. A few ways that you can test that is;
*place a vacuum gage on the intake manifold, start the engine and raise the rpm about 2000 rpm while noticing the engine vacuum. If the engine vacuum starts to drops, the exhaust more than likely has a restriction (could be catylytic converter/muffler/resonator).
* take the exhaust loose before the catalytic converter and drive the car to see if it has power again even though it may be noisy.
If the exhaust system is rusty, there is a good chance that the problem is in the exhaust system. If the exhaust system is not noisy or leaking try puttin your hand over the rear exhaust pipe to stop the exhaust from exiting; there should be a fairly strong push against the hand if the exhaust has no restriction and if it is restricted the push against your hand will be very light or minimum which could indicates an exhaust restriction.

Posted on Jan 18, 2013

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