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Old 07-07-2019, 05:42 AM   #1
MisterM52
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Default Knock Sensor Error & Height Adaptation

My M44 has been running rough recently. I am having some errors, I recently fixed a bad cam sensor it helped some and got rid of the cam sensor error however now I have a knock sensor error and a height adaptation error.

I went for a drive today, came and plugged it into inpa, the car sounds a bit like a truck or diesel and the cylinder smoothness idle shows

Cylinder 1 67
Cylinder 3 63
Cylinder 4 195
Cylinder 2 138

So either the Cylinder 4 & 2 and compensating for 1 & 3. or those are the problematic ones. Never had this before the bump and its been sitting for just 2 weeks.

Will the knock sensor 1 being bad cause this?

Will test the knock sensor values tomorrow. Whats the height adaptation error? related to maf?
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Old 07-07-2019, 10:12 PM   #2
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Both of my knock sensors were brittle and cracked into a million pieces. I ended up replacing only the front sensor. Before doing so it ran like absolute sh*t, very rough, wanted to die on several occasions. It runs okay now although i do plan to replace that second sensor. I really need to get my hands on an old win xp laptop with a real serial port so i can use INPA.


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Old 07-07-2019, 10:23 PM   #3
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Quote:
Originally Posted by thenjnick View Post
Both of my knock sensors were brittle and cracked into a million pieces. I ended up replacing only the front sensor. Before doing so it ran like absolute sh*t, very rough, wanted to die on several occasions. It runs okay now although i do plan to replace that second sensor. I really need to get my hands on an old win xp laptop with a real serial port so i can use INPA.


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Well I am not sure if you need a serial port, I read my M44 with just the FTDI cable off ebay and INPA setup in an old NC laptop. For serial port, the HP 6730B has one, its old and widely available. Here is something - https://www.youtube.com/watch?v=JhNwUNaLQi8

So back on to it, the engine has only 2 knock sensors right? last I checked the sensors were both attached to a single connector?
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Old 07-07-2019, 10:35 PM   #4
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Quote:
Originally Posted by MisterM52 View Post



So back on to it, the engine has only 2 knock sensors right? last I checked the sensors were both attached to a single connector?

Youíre right, thats a good point, my mistake they are indeed wired to the same connector on the m44 harness, I was thinking m42 where they are separate parts. Maybe this has something to do with the fact that they combined them on the later models? Or possibly because every connector on that earlier harness is almost identical and most people seem to mix them up when re installing. Lol




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Old 07-07-2019, 10:44 PM   #5
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I didnít realize you had a video up about the software, Iím gonna check that out as soon as Iím off work. However last few times ive tried with my current laptop using the VAGCOM (with ftdi chip) and OBD2 to OBD1 adapter, I will get an error on INPA when trying to load the engine specs and reading the ecu. Ill grab one of those HPs to get to the bottom of it. Thanks for the resources!


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Old 07-07-2019, 10:50 PM   #6
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Would you say I ought to replace them them? I already asked my guys to find it and send it to me. When you see on the M44 (and I guess M42?) the sensors are between Cylinder 2 and 4.

Quote:
Originally Posted by thenjnick View Post
Youíre right, thats a good point, my mistake they are indeed wired to the same connector on the m44 harness, I was thinking m42 where they are separate parts. Maybe this has something to do with the fact that they combined them on the later models? Or possibly because every connector on that earlier harness is almost identical and most people seem to mix them up when re installing. Lol




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Old 07-07-2019, 10:59 PM   #7
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I would just replace them even if its just for piece of mind..and yes quite a lovely spot, i managed to change the front sensor without having to take both manifolds off, Iíd say they held up well for 20+ years of heat cycles, and this car runs pretty warm up here on the east coast.


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Old 07-19-2019, 06:16 AM   #8
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Replaced knock sensors. The knock sensor issue is gone, main issue is still there. looking in INPA, 02 sensor is functioning right. The car only starts to have the issues once its warmed up (91C / half way) 121 height adaptation error load registration, havent found anything on this particular code, but it makes it all go crazy. Idle is around 900rpm when cold and 1100rpm when warm. I am beginning to very much dislike the 4 cylinder motor.

Its not even pointing me to the right direction. I might give up on the ti as I will be leaving for eu in a few months.
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Old 07-19-2019, 06:53 PM   #9
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Thats unfortunate, im sorry to hear it. I wish i had more knowledge on this one..


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Old 07-20-2019, 02:07 PM   #10
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Thats okay, you tried your best to help. I am fairly new to these motors myself, I recorded this video if anyone can chip in. Just didnt think a speed bump would be the end of it all. I am thinking if its the tensioner chain, seems to have no loseness when I opened the valve cover. however who knows.


https://www.youtube.com/watch?v=E6BOLpOrnss
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Old 07-20-2019, 04:12 PM   #11
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Huh, so youíre getting this noise whether its hot or cold? How did the chain guide look when you had it open? Im sure if it was damaged you would have noticed, it isnt hidden at all. Thats really irritating and the fact that one bump caused this seems like a freak occurrence although i guess anything is possible..


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Old 07-22-2019, 01:39 AM   #12
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I think it may be a issue with the tensioner. I took the tensioner off the other day and took it apart so not sure but I think it could be it the noise and all. Here is a video.

https://youtu.be/jP9UQH486mM
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Old 07-22-2019, 06:13 PM   #13
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Wow Iíve never seen one with that much play. Well after seeing that it looks possible that timing jumped a tooth after hitting that bump. I would replace it for sure if you still have the patience for this little guy..


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Old 07-22-2019, 06:15 PM   #14
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Man how much time did it take to pull the timing cover? I have to do mine its starting to leak


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Old 07-22-2019, 07:10 PM   #15
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I wonder whats the fastest method to check the timing to see if its correct or not on these motors?

The timing case was a very simple job, 10-20 mins really. What you do is grab a 22mm socket and wrench, go under the car and look for the little rubber cover on the exhaust side of the motor, so you can see the fly wheel and all. As you turn the motor (easy pezy) you will see some 3-4 little holes to lock the fly wheel onto. use a m8 bolt and jam it in there well. next go back up and undo the flywheel bolt, just like you would any regular bolt, anti clock wise. use a breaker bar or just use a long piece of square tubing or just regular tubing, 3 foot is plenty long. IIRC when you do it back up its 200ft/ibs.

But really when you do it back I would use prematex and not the steel or paper gasket. And the tensioner can be removed from the side as we know, if I knew I would had done that earlier. This wont be my last ti, I assure ya. In Germany I will grab another one and have fun there.
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