- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
www.jaguarforum.com/showthread.php?t=54266 Mar 3, 2013 - I recently bought a 1993 6.0 V12 XJS and when it is started from cold it runs ... to 1300 RPM so it wants to surge forward when braking which is strange. ...Classics · XJS 3.6,4.0,5.3 & 6.0; 6.0 V12 XJS High RPM When Warm ... You might want to adjust the aux (extra) air valve to bring the idle speed down.
Need to be more specific here. Runs rough...like misfiring? or vibrating excessively at about 1500, and again about 3000 rpm? If it's the latter, chances are your engine's balance shaft is not timed correctly. This causes a heavy high-frequency vibration/buzz throughout the car, at the aforementioned rpm ranges. If it's more like a misfire/stumble, look into your ignition system, or possibly a sticking EGR valve. (This will cause a mild surge/bucking under light accel, peaking between 45-50mph. Good luck!
Besides a leak on intake I will check the ECU just to make sure that thing is working as it was intended to, a sitting car usually have moisture build up and is not friendly with electronic components.
Is it a manual or auto? Assuming its a manual, is there an ABS light on? If so or if you hace changed the brake pads recently or even had the tires off or rotated, there could be a problem in the brake pad sensor or abs wheel speed sensor.
Check with Porsche service (your closest dealer) for recalls or TSB (Technical Service Bulletins) related to your concern and check the cayman/boxster owners clubs for similar posts and resolutions.