Reading Mikes comprehensive article on tuning the 4.2 XJR, I see the photo of the removed inlet air temperature sensor, and his description of its position, but I can't locate it on the vehicle. Do I need to first remove the air intake tube (if so, does this just pull off upwards at the throttle body end) Would anyone have a photo or diagram of its location, a fairly extensive google hasn't yielded anything,
Thanks in anticipation,
Excellent forum!!
Charlie
XJR inlet air temp sensor location
Re: XJR inlet air temp sensor location
Morning Charlie.
There are two sensors that read air temperature on a 4.2R Jaguar engine. The first appears to be built into the MAF (Mass air FLOW) sensor on the tube which forms part of the air filter box lid. This is often seen on a high level dealer type diagnostic unit as being IAT sensor 1.
The second one which I`ve never seen is buried down low on the O/S cylinder head but is badly obstructed by the O/S intercooler tank (brick). I didn`t remove the charger intercooler units when I overhauled and modified the supercharger. I already had enough on my hands at that time without adding to the work. As such I was not able to photograph that sensor. This is often seen on diagnostic units as IAT2.
To access IAT2, it means the removal of the supercharger (nightmare job due to lack of working space at the back of the engine). You would have to remove the inlet plenum, the throttle body, supercharger by-pass actuator, EGR valve (another devil incarnate), the supercharger inlet elbow (fourth bolt obstructed) , coolant and air pipes and finally the rear bolt which fixes the charger to the top of the engine block. The supercharger then needs to be lifted off the engine. That done half a dozen bolts fix the OS intercooler brick to the O/S cylinder head.
A third sensor, the MAP (Mass air PRESSURE) sensor is fitted to the rear of the charger elbow. It is worth removing with the charger inlet elbow and sensor for cleaning. You are likely to find crank case breather sludge within the elbow and coving the trench in the elbow where the sensor is fixed. This sensor gets filthy.
It doesn`t suprize me that you cant find an image of IAT2 either on or off a car. That would really only be available if someone had gone that deep into an engine strip and taken the trouble to photograph and put an image on line. Images of most of this type of work will be few and far between. Stripping one of these engines is for the technically experienced and will in most cases be performed at dealers and indipendent repair shops. I would suggest there are only a handful of us working outside and away from a garage who have the necessary knowledge, skill, enthusiasm and competance to perform such deep strip work. These cars were never designed to be repaired outside of a professsional garage environment and getting deep strip information is not easy.
Thats the best I can offer in answer to your question.
Mike
There are two sensors that read air temperature on a 4.2R Jaguar engine. The first appears to be built into the MAF (Mass air FLOW) sensor on the tube which forms part of the air filter box lid. This is often seen on a high level dealer type diagnostic unit as being IAT sensor 1.
The second one which I`ve never seen is buried down low on the O/S cylinder head but is badly obstructed by the O/S intercooler tank (brick). I didn`t remove the charger intercooler units when I overhauled and modified the supercharger. I already had enough on my hands at that time without adding to the work. As such I was not able to photograph that sensor. This is often seen on diagnostic units as IAT2.
To access IAT2, it means the removal of the supercharger (nightmare job due to lack of working space at the back of the engine). You would have to remove the inlet plenum, the throttle body, supercharger by-pass actuator, EGR valve (another devil incarnate), the supercharger inlet elbow (fourth bolt obstructed) , coolant and air pipes and finally the rear bolt which fixes the charger to the top of the engine block. The supercharger then needs to be lifted off the engine. That done half a dozen bolts fix the OS intercooler brick to the O/S cylinder head.
A third sensor, the MAP (Mass air PRESSURE) sensor is fitted to the rear of the charger elbow. It is worth removing with the charger inlet elbow and sensor for cleaning. You are likely to find crank case breather sludge within the elbow and coving the trench in the elbow where the sensor is fixed. This sensor gets filthy.
It doesn`t suprize me that you cant find an image of IAT2 either on or off a car. That would really only be available if someone had gone that deep into an engine strip and taken the trouble to photograph and put an image on line. Images of most of this type of work will be few and far between. Stripping one of these engines is for the technically experienced and will in most cases be performed at dealers and indipendent repair shops. I would suggest there are only a handful of us working outside and away from a garage who have the necessary knowledge, skill, enthusiasm and competance to perform such deep strip work. These cars were never designed to be repaired outside of a professsional garage environment and getting deep strip information is not easy.
Thats the best I can offer in answer to your question.
Mike
X350 Co-ordinator
2004 XJR
2004 XJR
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Charlie1080
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- Joined:Sat Oct 14, 2017 3:55 pm
Re: XJR inlet air temp sensor location
Brilliant, thanks Mike, I now understand it to be the relatively straight forward MAP sensor I am looking for, and how to locate it,
I shall crack on!
Charlie
I shall crack on!
Charlie
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