20 Most Recent 2001 Jaguar XJ8 - Page 4 Questions & Answers

you need to get the dtc codes out of the ecm to aid diagnosis could be lots of things, air leaks in the induction are a common cause,

gear box under car attached to engine

hooked up to the rear of engine gear box is your transmission

this warning can be flagged by lots of reasons you really need to get the fault codes out of the engine control module but the common causes i have found after working on these cars for a few years are air leaks after the mass air flow sensor, sticking throttle butterfly in the throttle body, the throttle itself, lamda sensors, and knock sensors, and because the temp gauge does not give you a true temp reading the engine could be overheating the clue to that is the rad fan always running

level and filler plug is on the rh side side of gearbox on underside near rear of box 8mm allen key has to be checked with engine running after working through gears ending up in p or n @30 to 50 degrees c be carefull you dont burn your hands on the exhaust use the correct fluid you are supposed to use jag diagnostic equipment to check oil temp but it is a wide margin so other means may be used

check for fault codes in ecm at a guess knowing this model well it will have logged a code for heated oxy sensor faults sometimes you clear the codes and they dont come back.if the light comes back then one or more sensors are faulty more than likely open cicuit heater element in the sensors there are 2 or 4 sensors on that engine depending on market spec. the norm is 4 you can compare the sensors with a multimeter to locate the faulty ones ideally you need a wiring diagram to do this. genuine jaguar ones are expensive i have changed all 4 in the past to cure this problem at a cost off over 1000 pounds the other likley causes are throttle body problems and air leaks but you normally get restricted performance warning showing hope this helps been a jag tech for almost 50years

dose it say random miss fire ?? what is the code?

coolant level switches are always on or near the top of the rezervoir.

get a rebuilt or used transmission. Jaguar says you don't have to change trans fluid because it should last the "life of the trans" which means it will die just like everything else. Fluid change will do no good. I just went thru this.

hey rob_andersen,

yes their is a way to replace the mass air flow. Get a can of brake clean or throttle cleaner, throttle cleaner is going to work best. remove the until and spray it down with throttle clean, let it dry for about 15 min. and reinstall it.

Now a little warning for you, IF their is no visual damage to the mass air flow then you can do this successfully. Now the reason why I always replace them instead of spraying them down is because is MOST cases the mass air flow will start acting up again. Sometimes it takes a weeks, sometimes months, sometimes years its hard to say.

But the worst you have to loose, is it doenst work an your out 5 bucks for the can of fluid.

Try to use a good quality "Foam Cleaner" - don't use too much - ; it might be due to dust or dirt. Leave if for a few minutes, and then tap gently on the ashtray cover. Repeat the process if needed, then wipe clean. This may solve the problem, as I had a similar case two days back but with the ashtray of one of the rear doors on my 1999 XJ8.. and this solved it.. also I used same trick to make the top of the ashtray compartment in the center console opens more freely.