S-Type- Misfiring? Engine check light?

[BRGTom]

I have a problem with my S-type. About a month ago, while on the way back from a 200 or so mile round trip my engine check light flicked on. I panicked, stopped the car and called the AA.

Much to my embarrassment, after waiting about 3 hours for help, the AA man fired up the engine, no warning light. He checked under the bonnet ect but could see no issues so off I went. About a week after that I noticed the idle had become rougher, and then a few days after that the warning light was back on.

Its being going off and on sporadically ever since, and whenever I've plugged the Diagnostics machine in it comes up error free.

Has anyone else had this? The cars got the 4L v8 engine, and is not high mileage.

Any ideas?

[Adam]

BRGTom,

Welcome to the club.

Unfortunately, its quite hard to pinpoint why a cars EML has come on when the diagnostics machine comes up blank. What you could be experiencing, is wiring issues. If you can, check as much wiring in the engine bay as you can and look for damage. Worn HT leads can also lead to a misfire. If you still see nothing, a Jaguar specialist will probably be able to sort you out at a cost.

I hope this helps you out.

Adam.

[David F]

I had the same problem with this intermittent fault. It was the number 4 coil pack.

I had to run the car for a further 3 months before it completely failed and registered on a fault finder.

If you have to replace one. Make sure the garage replaces all your spark plugs. A bit of a pain, but it stops putting undue pressure on the remain old coil packs.

David