Maintenance for Jeff's M5

[Mike1]

Just unplug them, the car will usually dip and then regain its composure.

Our Project 330Ci drives like a dream without its MAF. :rollsmile:

 

[S///Mon]

When you unplug the MAFS, doesnt the car also go in to "Limp home mode"?

 

[Mike1]

Nope, it just switches over to a preset air/fuel setting which usually wont let the car run smoothly.

When you unplug it there is a dip in the revs, as the car tries to figure out what is going on and then the car should either idle smoothly (if the MAF is buggered) or hunt as in rev up and down or idle very very rough.

Mike

 

[jeff_denning]

Nope, it just switches over to a preset air/fuel setting which usually wont let the car run smoothly.

When you unplug it there is a dip in the revs, as the car tries to figure out what is going on and then the car should either idle smoothly (if the MAF is buggered) or hunt as in rev up and down or idle very very rough.

Mike

Thanks dude! Do I unplug them when the car is running or off?
Will also run a quick diag on the car to see what error codes are there.

 

[Mike1]

Hi Jeff

Thanks for your mail about the oil, I figured I would share the thoughts we have about the cars potential problems here so that it can be used as a reference for others with a similar problem.

Rolf and I discussed the symptoms of your problem he is 99% sure it is not related to the UniQ Chip but is most probably a sensor issue.

Nothing on the ECU changes, however the information the ECU receives can affect the way it operates.

The first suggestion is to spend some time checking all your sensors, unplug them and check for corrosion, and make sure they are firmly connected. Continue to check all your ground wires on the car, perhaps undo them and clean them before re-attaching with some battery grease.

My Smart had a similar issue which turned out to be a ground problem on the motor.

Also check the ECU plugs for water or corrosion, followed by the Temperature Sensor or Temp Sender is it has one (not to sure as this is a common issue on some VW's which gives the same symptoms).

Furthermore check all piping on the intake as this may cause the MAF to misread the vacuum pressure causing the same symptoms you are experiencing if the pipes are cracked or brittle.

It may also be the MAF itself, unplug it while it is running and if you want I have some cleaner here, you are welcome to bring the car around and we can clean it for you.

Your car is decatted right?

Mike

 

[2xqzit4-zn]

NITROUS!!!

 

[Mamba]

Which side mirror motor do you need? I still have the driver side one lying around.

I also have some oxygen sensors if anybody is interested, not brand new but I suspect not that old either.

Big PLUS ONE on importing the spares, you will safe mega Rands if you can wait a week or two for delivery.

I use this place for my purchases:
http://eshop.original-teile.de

Other things that I will change as a matter of preventative is the four oxygen sensors, it made a huge difference when I changed mine, well that and connected them the way they were suppose to be of course..

My suggestion is that you use DIS or INPA to check your sensors, you will get a very good idea what is working or not, even for the vanos there are very nice tests in DIS that will show in detail if you have a problem or not. If you look in the technical section here on the forum you will find a write up that I did on how exactly the vanos system work.

Other items that does fail is the four cam shaft sensors, they are expensive and a bitch to change but again, without them working properly you will get weird fault codes.

 

[jeff_denning]

Champion reply Mike, shot dude! Always appreciated.
The oil is awesome, massive thanks again for holding it for me - I know Pi was keen to get his hands on it for his M5 :rollsmile:

Gonna see whats happening with the MAF's and pull error codes when I get home along with all the other sensors, the plugs too if I can grab the tools. Really wanna dyno the M5 too, could see some comparisons from there too.

Will post some feedback when I'm back at the office on Thursday (feels like Friday today raise: )

 

[jeff_denning]

Thanks again for all the suggestions guys.
Had a look at a few things yesterday, just still need to get my diagnostics up and running on the mac.

Is it normal that the one MAF sensor only has a 4 pin connector and the other a 5-pin?
Anyway, disconnected both and saw the slight dip in RPM. What I found strange though, is when I plugged them back in (engine still running) the engine would turn off completely, lights still lit on the dashboard.

Back to the MAF wiring, I found that the passenger side MAF had 4 wires running into the sensor but had 5 connectors. I swapped the MAF's around, which seemed to match up the wiring, connected them again while the engine was running and the revs just came back up to normal. Strange? Normal?

Anyway, I'll run some testing when I get back from the office tomorrow and see if it's made any difference. The girlfriend dragged me away mid-MAF install :argh: :rollsmile:

 

[Mamba]

Yes one MAF has the air temp switch in it, hence the difference

 

[Nic_s]

Yes one MAF has the air temp switch in it, hence the difference

They can be the wrong way round? Let's hope it was that.

 

[Mike1]

Hmmm the car dying straight away is exactly what our 330Ci does when you plug the buggered sensor in. :fencelook:

 

[pi328]

The oil is awesome, massive thanks again for holding it for me - I know Pi was keen to get his hands on it for his M5 :rollsmile:

Yeah, the bugger didn't want to sell your oil to me

 

[jeff_denning]

Hmmm the car dying straight away is exactly what our 330Ci does when you plug the buggered sensor in. :fencelook:

:argh:
Hopefully it isn't.
Tried again yesterday without cleaning the MAF's, but swapping them around and the car doesn't turn off when I plug 'em back in - so I think I'm making the smallest bit of progress.

Took the M5 for a proper drive yesterday, still experiencing the issue though - so it's time to go the MAF cleaning route next.

Strangely though, playing around with DSC and Sports Mode - the car seems fine and still pulls like a beast on top end. Purely for testing purposes, I ended up getting things a little sideways around my personal traffic circle yesterday and all the torque in the world was there.

Once I've cleaned both MAF's and the issue is still there, what next? Look at the UniQ?

---

The oil is awesome, massive thanks again for holding it for me - I know Pi was keen to get his hands on it for his M5 :rollsmile:

Yeah, the bugger didn't want to sell your oil to me

Haha!! I still have a litre left in the garage. I'll sell it to you in exchange for your MAF's :rollsmile:

 

[Mike1]

Bring the car around, we can clean the MAF and check. :thumbs:

 

[jeff_denning]

Bring the car around, we can clean the MAF and check. :thumbs:

PM sent raise:

 

[922-ZN]

Good looking car

 

[jeff_denning]

So.... turns out my clutch is slipping :fencelook:

I've heard that a 330D clutch fits and works for the E39 M5. Any recommendations on a place to get one and have the clutch fitted, installed and just checked up on.

I'd prefer a check-up first, and hopefully a quick fix. But if push comes to shove, I'll replace

 

[///MNM]

So.... turns out my clutch is slipping :fencelook:

I've heard that a 330D clutch fits and works for the E39 M5. Any recommendations on a place to get one and have the clutch fitted, installed and just checked up on.

I'd prefer a check-up first, and hopefully a quick fix. But if push comes to shove, I'll replace

Hi Jeff

The 330d clutch kit works perfectly. As a wise man once told me "I Sh!t you not".
http://www.bmwfanatics.co.za/showthread.php?tid=25270

 

[Nic_s]

So.... turns out my clutch is slipping :fencelook:

I've heard that a 330D clutch fits and works for the E39 M5. Any recommendations on a place to get one and have the clutch fitted, installed and just checked up on.

I'd prefer a check-up first, and hopefully a quick fix. But if push comes to shove, I'll replace

The 330d clutch should be about R3500. Not sure who can fit it for you that side of the city though.