1997 xj6 76,000 miles runs great great condition,30 minutes after i put 93 octane in it today the check engine light came on...cheap gas???the car runs great, the manual said its the drive train???what the???i was think 76000 service time??or oxygen sensor??also at 60mph the temperture gauge runs almost in the blue cold area, and then at 45 it runs a 1/4 of the way do jags runs cold??? help thanks.....
ps how do you get the trans dipstick out ??i flipped the little lever and the darn thing would come out.......

 

Had a similar problem with the check engine light on my 97 xk8 immediately after a state inspection. Called the dealer, they told me to bring it in, on the way I stopped for gas and when they reseated the gas cap the light went out. So that is the 1st thing to try.

I regret I do not have info on your other questions.

rabbits2

 

If Im not mistaken, Jags have static gauges. The gauge wont go past the mid-line unless its about to blow up (slight exaggeration). One of the guys should be here to clear this up for you soon though. And keep posted on the gas cap thing too. Id be interested to know if that was the problem.

 

If the engine is running well, I doubt there is a problem with the gas you bought.

You have to read the diagnostic trouble codes. Places like Advance Auto and Autozone will do this for free and provide you a printout of the DTC and some cryptic explanation. Report back what you learn from this.

The faster you go, the lower the temp.... That sounds like your thermostat may be stuck open. If so, the engine may not be warming up sufficiently (or quickly enough). The engine controller might be flagging this as a problem. Having the codes read may provide the answer to both issues you describe.

I can't help with the dipstick.

 

dipstick just pulls straight out.. gets stuck after time.. check engine light can be anything.. just get it check either .. ignition coil.. or o2 sensor.. or cam sensor fault..