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Hello All. My cat is purring like a kitten with a frog in its throat. I have narrowed it down to a potentially bad crankcase vent valve (PCV), and potentially a bad MAP sensor. The evidence I have for a bad PCV is that the idle goes up and down and is intermittently rough, plus after removing the valve and inspecting, I found that the valve was stuck, so I cleaned it with carb cleaner and soaked it in mineral spirits. But it is still intermittently rough while throwing a P0108 code. I used the iCarSoft scanner and found that there could be an issue with the MAP sensor, as it is off by more than.5V when compared to barometric pressure sensor voltage. I have a new crankcase vent valve which I am going to install after an engine oil flush and change, and I have a new MAP sensor on the way. So my question is:
Where exactly is the MAP sensor located on a 2009 Jaguar XF 4.2L Supercharged?
I have looked for diagrams and other images extensively online and within this forum. I know it is likely somewhere on the throttle body assembly, but I sure would appreciate some actual pictures of the location before I dive into this, if anyone has them or any advice.
Thanks.
PS. This issue is intermittent, as I mentioned above, and whenever the issue is not present, this thing really does purr like a kitten, and is smooth as silk. But when this issue pops up, (and it does regularly) this cat is coughing up fur *****.
On the 4.2l XF with a supercharger the MAP sensor is mounted on the rear of the throttle body elbow.
Sometime in the next few weeks I've got to get that off because that stupid plastic/rubber thing that connects the brake boaster vacuum hose to that elbow has disintegrated and I can literally pull it half way out the elbow with my fingers. I'll try and get a picture of it, subject to not loosing all the skin on my hands trying to work in the tiny space between the engine and the passenger wall and giving up.
Thanks, fivel. Very helpful. I suspect I likely have the same issue with the brake booster hose fitting. I am going with this solution for that, but first I must perfect my shrink ray so I can get back there: https://www.jaguarforums.com/forum/x...itting-194252/
That is a much better solution. But I’m just going to knuckle-bust this John Guest push fitting in there without removing the elbow, hopefully. If I end up having to remove the whole unit, I will go with the brass solution, otherwise $13, some busted knuckles, and some of the best expletives 13 bucks can buy, and I’m good for another 90k.
Working back there recently, a borescope helped a lot. You may also inspect what's going on with the connector or any fried wiring. But for this thing it will be hard to avoid having to remove the intake elbow which means dealing with the EGR. Guy here recently had to pull the whole engine when that didn't budge.
Thanks, litteredwithfaults. Very helpful. I’m really hoping I can get a hand back under there to replace that MAP sensor (I may have to tape an allen wrench to a finger). And hoping the same for the brake boost tube collet and o ring.
I literally did a spit take with my coffee when I saw the picture of the entire engine drivetrain and front end removed in that thread where he says, “there, now I think I can get to the EGR”. Hilarious.
I’m attaching a few pictures here to help anyone else who may be hunting this down as well.
05-08-2021, 07:24 PM
P0108 - 2009 Jaguar XF 4.2L Supercharged
