2001XKR idleing irracticly and engine light is now on. I suspected the kids have put in cheap gas but it Seems to drive fine when over 1000 rpm to the supreme grade gas pump.. Anyway just got the following10 codes. 300,303,304,305,306,307,308,1316,0133,0153 and 1111. Would appreciate some starting points as it looks more serious than spark plugs however it has over 120k miles and until this week the engine was running sound. Cheers

 

Have you replaced the plastic secondary timing chain tensioners?...they were still used on most 2001s. I would not even run the engine with your mileage until you do that and verify the cams are aligned. It is possible your timing chain has skipped a tooth....one more could lead to a seriously damaged engine.

 

Ok thanks. I haven't changed them and do not know if previous owner did? No Maintainace record of this being done from the dealer. How do I check cam alignment or is it a dealer thing.

 

There are volumes of information on this forum regarding the secondary tensioner problem. I suggest you use the forum search.

Many members have done it on there own with the help and support of the forum. Even if this turns out not to be the root cause problem, it absolutely needs to be checked on an engine of your vintage and mileage.

Once you read some of the material, come back and ask questions.

If you do not want to do it yourself, an independent shop that services Jaguars will save you money over the dealer.

 

Great practical advise. My son just finished his first year apprenticeship at a dealer so I will get him involved. His been like a leech while at school so hopefully he can help pay his way on the wife's car.

 

Please confirm that you understand WhiteXKR's comment;
Rough idle is a classic symptom of cam chain tooth jump. Many engines have survived jumping a single tooth, none will survive a second jump.

 

Working with the jag dealer on this issue. Thanks.

 

That sounds a familiar scenario!

Best of luck in making him independent and getting the car running smoothly.

Graham