Mark Allen

Can bad coil packs cause reduced performance?

Thank you Cubist and I will keep you posted on my out come.

On 7/5/2018 at 4:58 AM, cubist said:

Hi Mark,

Good news that its not a diesel there are many more likely causes of the problems you're seeing. At that mileage its a good bet that the catalytic converter is choked and the resulting back pressure is causing the reduced performance. Best bet would be to get hold of a Jaguar specific OBD2 code reader to get the DTCs from the ECU - stay away from the iCarsoft i930 though, they have problems reading the ECU - the DTCs will confirm the root cause of your problems and perhaps save you a small fortune in the process.

Some say that catalytic converters, if this is the root of the problem, can be cleaned. Personally I am not convinced but it may be something to try. There are a number of sources on cleaning techniques/methods/services on the web and you may be able to find someone in your part of the world.

Hope this helps but I'm sure that other contributors to the forum will also provide some input.

Keep us posted,

Cheers

Thank you Cubist for your information I think I am going to take the off and see if cleaning them help. I checked into some kind f the cleaning products and the best product there is for some reason is not allowed in the U.S.A. and tI will keep you posted on the take off and clean job.

Thank you very much Cubist for giving me a possible answer to my problem.I have never heard of cleaning catalytic converter's but thanks to you for the resources I will check.

It is petrol Cubist and it has 190,000 miles.thank you for responding.

It is petrol Steve and thank you for responding.

My 2006 S-Type Jaguar keep losing power and speed down to 40mp and when you shut it off and let it sit it starts and runs fine. I have done alot of work on it and a friend suggested the catalytic converter's are clogged could this be the problem? Any input would be awesome.

My Jaguar keeps going in limp mode and will not go over 40 miles an hour.it has been suggested that it's the catalytic converter's clogged up?if there are no imisions where I live.can my car run without them?2006 S-TYPE Jaguar