Think i found my Maf sensor problem, cracked air box and EML on.
#1
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Well after going away and fitting two new maf sensors and still getting engine light on, went and done another inspection. Low and behold found this, a crack in the passanger air box. It is located right below where the inlet pipe begins, as you can see from one of the pictures the mesh protecting the sensor can be seen. Car did get a previous small bang low down on that side which i was aware of, non structural , which must have done the damage. I got an air line and put in up against the crack and the air is blasting through. The Maf sensor during live data was showing fluctuations in reading compared to the other side. Dealer is ordering a new air box so hopefully this is the end of it
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#2
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powerhouse (08-19-2014)
#3
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powerhouse (08-19-2014)
#5
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Well after going away and fitting two new maf sensors and still getting engine light on, went and done another inspection. Low and behold found this, a crack in the passanger air box. It is located right below where the inlet pipe begins, as you can see from one of the pictures the mesh protecting the sensor can be seen. Car did get a previous small bang low down on that side which i was aware of, non structural , which must have done the damage. I got an air line and put in up against the crack and the air is blasting through. The Maf sensor during live data was showing fluctuations in reading compared to the other side. Dealer is ordering a new air box so hopefully this is the end of it ![Icon Doh](https://www.jaguarforums.com/forum/images/smilies/icon_doh.gif)
![Icon Doh](https://www.jaguarforums.com/forum/images/smilies/icon_doh.gif)
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powerhouse (08-19-2014)
#6
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jagtoes, i hope this is the problem. The other side is perfect, 2 new sensors and 2 new jaguar dealer filters. the OK side shows good readings during the live data. The crack being before it hits the sensor would be letting in more air or out. As i said the side with the crack seems erratic. I'm presuming when i accelerate the car takes in air some is either coming in through the crack or pushed out, hence the readings. All i can do is try it, anyway i would say that the crack isn't doing any good for air intake.
Last edited by powerhouse; 08-19-2014 at 08:24 AM.
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powerhouse (08-19-2014)
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#8
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jagtoes, i hope this is the problem. The other side is perfect, 2 new sensors and 2 new jaguar dealer filters. the OK side shows good readings during the live data. The crack being before it hits the sensor would be letting in more air or out. As i said the side with the crack seems erratic. I'm presuming when i accelerate the car takes in air some is either coming in through the crack or pushed out, hence the readings. All i can do is try it, anyway i would say that the crack isn't doing any good for air intake.
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powerhouse (08-19-2014)
#9
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powerhouse (08-20-2014)
#11
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yes 8bit i agree, mine have 2 dealer jaguar filters and 2 new maf sensor. Car isn't going to dealer till end of next week or following week. Today i viewed crack again and got some gorilla tape and sealed the crack from the outside, just to see would it make any difference. Erased engine light so will see if it comes back on. My wife has taken it for a drive today so will see is it on later this evening. Still getting erratic idle, rpm needle moving up and down when idle from 500-1000 rpm. Sometimes it goes below 500 and it feels as if it is going to die then picks up again. The car has had new plugs fitted around 800 miles or so, fuel consumption and when driving is ok.
I'm kind of losing my patience on the matter.![Icon Doh](https://www.jaguarforums.com/forum/images/smilies/icon_doh.gif)
Just worried i would be damaging something driving around with this issue, do you or anyone think it is OK to drive with this issue.
I'm kind of losing my patience on the matter.
![Icon Doh](https://www.jaguarforums.com/forum/images/smilies/icon_doh.gif)
Just worried i would be damaging something driving around with this issue, do you or anyone think it is OK to drive with this issue.
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#12
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It make you wonder why some car makers use 2 MAF sensors and others use only one. I was looking at a new Camero last night with the LSR SC engine at 580 HP and it only had 1.
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#13
#14
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It is unlikely that a small-ish air leak will cause any permenantly damage. If you can monitor the short term fuel trims just check that they aren't pegged at +/- 25%. If you see them somewhere in the middle, then the car is able to adapt to the extra air and no big deal.
I'd wager your idle problem is that the leak is a larger portion of the total air the engine is consuming at low rpm and load. Once you get moving the leak is washed out by the larger overall airflow so the car runs fine at speed.
And I can't say as I understand the dual MAF thing either. Far as I know, the two MAFs go through two tubes to a single plenum and single throttle body. What's even more bizzare is that on the x100 the 4.2L only had one MAF and one tube.
I'd wager your idle problem is that the leak is a larger portion of the total air the engine is consuming at low rpm and load. Once you get moving the leak is washed out by the larger overall airflow so the car runs fine at speed.
And I can't say as I understand the dual MAF thing either. Far as I know, the two MAFs go through two tubes to a single plenum and single throttle body. What's even more bizzare is that on the x100 the 4.2L only had one MAF and one tube.
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powerhouse (08-20-2014)
#15
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#17
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I have usually found that a "hunting" idle in the range that the OP has stated is indicative of an air /vacuum leak in the intake system. This would fool the sensors and change the idle. The basic function of the MAF is to work with the 02 sensors and ECU to adjust pulses of the injectors to attain the optimum fuel/air ratio. At least that is the short definition. I would think the MAF could adjust for the crack in the intake box without setting a code. Did they try a smoke test to see if there are any leaks in the emission system.
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powerhouse (08-21-2014)
#18
#19
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Well after a free week or so my engine light came on again with the MAF code. Still have air box crack taped up so it must be another problem. I think i am going to give up on it, will let it run and run, could be anything.
Off topic , i am entering a 3 day cannon ball run here in Ireland with around 150 cars taking part. All proceeds to the make a wish foundation Ireland a good cause. As i have never done this before ,it should be good fun and a chance to cruise with some fine motors.
Cannonball Ireland
Off topic , i am entering a 3 day cannon ball run here in Ireland with around 150 cars taking part. All proceeds to the make a wish foundation Ireland a good cause. As i have never done this before ,it should be good fun and a chance to cruise with some fine motors.
Cannonball Ireland
#20
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powerhouse (08-29-2014)
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