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Jaguar S-Type: I have a 2003 Jaguar S-Type that has had rpm…

I have a 2003 Jaguar...
I have a 2003 Jaguar S-Type that has had rpm fluctuations since I bought it. I took it to a Jag dealer but they could find nothing wrong. You can hear, and sometimes feel, the fluctuation, especially when going uphill. It is a regular sound that sounds until I take my foot off the gas. Could you tell me what is probably causing this? Could it become a dangerous problem?
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Answered in 49 minutes by:
1/24/2014
Jaguar Mechanic: Richard, Jaguar Technician replied 8 years ago
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,763
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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Hello and welcome to justanswer.com

Do you hear and feel this when you are cruising at speeds of 30-50 mph? Does the rpm move about 200 or so.
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Customer reply replied 8 years ago


It probably does kick in at those speeds, but it also happens at higher speeds going uphill. I don't know if the rpm moves about 200. It is about a quarter inch fluctuation on my dial.

Jaguar Mechanic: Richard, Jaguar Technician replied 8 years ago
Any fault warning lights or messages on
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Customer reply replied 8 years ago


No. Just the sounds. I put four new tires on it, but that didn't make any difference.

Jaguar Mechanic: Richard, Jaguar Technician replied 8 years ago
Ok I know this may sound strange but usually the surge is from the Torque converter. What happens is you are feeling the converter go in and out of lock up. Before replacing the converter the Transmission Control Module will need to be reset and reprogrammed with different software which usually corrects the surge. A Jag dealer will need to do this programming. Also if the engine light or gear box fault does come on there may be a fault code P0741 and if that is the case then the torque converter will need to be replaced.
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 16,763
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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Richard
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Richard, Jaguar Technician
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Satisfied Customers: 16,763
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