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I have a 1998 Jaguar Vanden Plas 4.0L V8. I'm getting codes for both banks being too rich and I'm thinking that my MAF sensor may be bad.
So I took this big sucker out and thought that it was quite a pain to clean even after spraying a full can of MAF sensor cleaner in there and not really knowing if I'm actually cleaning it enough or not.
So I then attempted to source one locally and found a guy parting out a 2001 Jaguar 4.0L V8 XK8.
So my thoughts were, since it was the same engine size and air box and tubing that runs from the MAF sensor to the throttle body - I figured I may be able to buy the 2001 XK8 MAF sensor and the unit it screws into.
I noticed something very subtle though and I haven't purchased the sensor from him yet because I suspect the wiring for the MAF sensor connector is different.
What I noticed is that there is a gold pin on the 1998 Vanden plas that is offset from the center in the connector to the MAF sensor as seen below:
On the 2001 XK8, there is a gold pin in the center on the connector and the MAF sensor.
Based on the details submitted by user ''taijirich'', I think I may be able to re-wire my 1998 VP MAF sensor harness to work with the 2001 XK8 MAF sensor.
I want to do this for a few reasons.
1. The 2001 XK8 MAF sensor is easier to clean.
2. It is cheaper to replace.
Has anybody done this before? Will it work?
If anybody has any information on this I'd greatly appreciate it!
The 1998 engine is a model AJ26 and the 2001 is a model AJ27 even though they are both 4.0 engines. There are numerous differences between the engines and I doubt it would be compatible. You should stick to a 1996 to 1998 4.0 engine.I also did a quick lookup and see at least 2 different part numbers so I would guess the units are VIN sensitive.
Hmmm, different engine models is a good point but you'd think the amount of airflow they would need would be similar no?
The torque and horsepower are recorded the same if I recall correctly.
To me this just seems like an upgrade in convenience in the models, not really an upgrade of functionality itself. But I'm no engineer of course, thus the thread.
It reminds me of the oil dipstick technical service bulletin. 'Get your new dipstick now, your engine should have more oil. Have the convenience of knowing where the actual full mark is.'
...different engine models is a good point but you'd think the amount of airflow they would need would be similar no? The torque and horsepower are recorded the same if I recall correctly.
The main output (the gold pin) of the MAF is a variable voltage, typically between 1.5 and 4 + volts, representing the mass of the air flowing through it. The curve (output voltage) vs. (mass of air flowing) is called MAF curve. MAFs having the same size and shape but different part numbers probably have different curves even though they are for similar cc. and performance engines. They are, in most cases, not specifically designed for a particular engine but usually come with a variety of standard MAF curves. The engine ECU is then programmed to work with the selected MAF. Since AJ26 and AJ27 have different MAFs and different ECUs, it is quite likely that an AJ27 MAF, though re-pinned to match, will not work with AJ26 ECU, i.e. will not provide the output voltage curve that the AJ26 ECU is programmed for causing either over-rich or over-lean mixture.
The MAF is required to provide very accurate voltage (for each given mass of air flowing) with the tolerance of approx. +/- 0.04 volts (thus the gold pin). The voltage curve of another MAF, even if just slightly different from the curve of the original MAF, will cause no-running of the engine because of such a small allowed tolerance.
06-12-2020, 10:35 PM
1998 Jaguar VP MAF Sensor Upgrade - Thoughts?
