Hi ALL,

I was driving my XKR with only 8.5k miles on it, and at certain highway speeds my car would chug and feel as if it was going to die. I gave it gas and it would settle down. Seemed like it would only happen at certain RPM's but could be wrong.

Any ideas of what the problem could be?

Fuel pumps were replaced about a year ago. Spark plugs have never been replaced.

Thanks,

 

With any powertrain issue my first action is to connect my scantool to check for any stored or pending codes. A lot of things can happen which don't illuminate the MIL and this approach often helps pinpoint possible causes.

8.5k miles in fifteen years is extremely light use (I put half that mileage on my XK in September this year alone) which in itself is often the cause of poor running.

An ignition issue with coil packs or plugs should set misfire code(s). Plugs should be nowhere near ready to change but a check on the business end will show how clean the engine is running.

For my money it's most likely a fuel related issue. Pumps are known to fail through lack of use (even though you have had a recent replacement), fuel deteriorates with age, filters can gum up as can injectors and the throttle body (TB).

The big concern would be the hesitation is the first signs of a failing TB but I suspect an 'Italian Tune-Up' () could get things back on song.

Graham

 

Be aware that ROTATING your tires front-to-back is NOT a good idea.
I had a customer that did that very thing on an XKR and the rear wheels were turning faster than the front (different tire sizes front and rear). The ASC would engage and was annoying to drive on the highway. At lower speed it did not seem to engage.

Called customer and told them it was NOT a Jaguar Warranty issue and to come get the car and put the rears on the rear and fronts on the front!!!!!!!!!!!!!!!!!!

bob

 

Well that's one for the books!

 

No denying that, Bob .............. ?????

Graham

 

My rears always seem to wear a lot faster then the fronts.

Now why would that be?

 

If you have an XKR then the rear tires/wheels are larger by design. Jaguar INTENDED for you to wear them down quickly. Why would you pay extra and not get your money's worth.

Just don't put them on the front and expect the 'TRAC CONTROL' to ignore that fact!!!!!!!

bob

 

One thing XK8/R owners seldom realise is that the front and back tyres, or tires if your American, are meant to be different sizes. Just check the handbook if you do not believe me.

http://www.jaguarforum.com/showthread.php?t=75123&