E39 M5 Fuel Consumption

[Elton_LV]

After seeing this post this morning.
Decided to take the M5 to work and a customer visit.
Reset consum-2 and distance,
Over +-37k's I averaged 14.8, won't lie, forgot here and there and floored it a few times (not an easy car to resist temptation)
Consum-1 at 19.5 is my regular monthly drive, to 3 month drive, and most of the time I get to where I want to go very quickly.

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[Eon]

Get the fault codes read, you have at least one if not more dead sensors on that motor. The dual MAFs on the S62 aren't known to last long either.

Thanks, I would think that it would go into a sort of a limp mode when the ECU senses that the info from the sensors do not add up?

The power delivery is smooth and the car pulls much better than other M5's that I've driven, so I hope it isn't sensors.

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Im in CPT and can have the codes read if you so wish.

Thanks Chris. You have PM

 

[Gizmo]

When the ECU senses a faulty sensor it reverts to a default map which will reduce power slightly and fuel consumption will increase, it won't go into limp mode or throw an EML light unless it picks up a major fault in the system.

 

[Ralf*]

When the ECU senses a faulty sensor it reverts to a default map which will reduce power slightly and fuel consumption will increase, it won't go into limp mode or throw an EML light unless it picks up a major fault in the system.

yup...thats the scenario on the 7 at this stage (MAF)

 

[Eon]

After seeing this post this morning.
Decided to take the M5 to work and a customer visit.
Reset consum-2 and distance,
Over +-37k's I averaged 14.8, won't lie, forgot here and there and floored it a few times (not an easy car to resist temptation)
Consum-1 at 19.5 is my regular monthly drive, to 3 month drive, and most of the time I get to where I want to go very quickly.

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This is good! That's about what I'm expecting from mine.
That's quite a clever way to use the 2 computers. Maybe I should do the same. In addition i will be calculating my avg by dividing the trip distance covered in one tank by the amount of fuel that was used.

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BTW @Elton_LV your car looks amazing bud!
What's the mileage on yours?

 

[Elton_LV]

She is still a junior, only 142 000k's on the clock, drives as if she was still new (that's also thanks to Bruce the guy that helped refresh the car)


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[Eon]

A HUGE thanks to ChrisBrand@TheFanatics who showed up at my office in a suit to plug in many many devices.

The problem seems to be the MAF sensors. I tried cleaning them this weekend but to no avail. Disconnected the battery and everything, but now all of a sudden the airbag light stays on and the CD Changer doesn't read the disks anymore :smashScreen:

I managed to get a price on a MAF sensor: R2040.82 (as opposed to R6771.17 at the stealership). I require 2x of these parts.

So within the first two weeks, this car is already costing me money.

 

[ChrisBrand]

Its a pleasure Eon.

As discussed I will just have a look at all our codes and advise accordingly.

The airbag light can be easily removed by myself.

Also as discussed just make sure the MAF Sensors have sufficient ground.

Will stay in touch

 

[Philip Foglar]

Fanatics helping Fanatics! Awesomeness! raise:

 

[M3_FTW]

You dont have to buy OEM MAF sensors. There is a VW one with the same part code that is much cheaper.

 

[Eon]

You dont have to buy OEM MAF sensors. There is a VW one with the same part code that is much cheaper.

Thanks,

It says BOSCH on the part, so VW probably also uses them. I phoned BOSCH Diesel-Electric and they quoted me around R2k each.

*UPDATE* I borrowed my colleague's E39 M5's MAFs and it's a lot better now. Getting a constant 20l/100km under hard driving now. Unfortunately I cannot borrow it for long, so I won't know how it will affect long term consumption.

Also, it's not misfiring intermittently anymore and idles smooth after every start!

 

[jcwdrop]

When the ECU senses a faulty sensor it reverts to a default map which will reduce power slightly and fuel consumption will increase, it won't go into limp mode or throw an EML light unless it picks up a major fault in the system.

yup...thats the scenario on the 7 at this stage (MAF)

Replace with the VW one. I picked one up at goldwagen for R1700. put the sensor into the original housing (5 min job). The car feels a 100kw stronger.

 

[Eon]

When the ECU senses a faulty sensor it reverts to a default map which will reduce power slightly and fuel consumption will increase, it won't go into limp mode or throw an EML light unless it picks up a major fault in the system.

yup...thats the scenario on the 7 at this stage (MAF)

Replace with the VW one. I picked one up at goldwagen for R1700. put the sensor into the original housing (5 min job). The car feels a 100kw stronger.

How long ago was that? I also phoned Goldwagen gave them the part no. (surely the part no. will be the same regardless of car brand) they quoted me close to R3000 each.

*EDIT*

Now that you mention the housing, that price might've been for the whole assembly incl. the housing. Did you get your part no. from the sensor itself?

Also, when I drove the car today with the borrowed MAFs, the power felt more or less the same, it just behaved better

 

[jcwdrop]

When the ECU senses a faulty sensor it reverts to a default map which will reduce power slightly and fuel consumption will increase, it won't go into limp mode or throw an EML light unless it picks up a major fault in the system.

yup...thats the scenario on the 7 at this stage (MAF)

Replace with the VW one. I picked one up at goldwagen for R1700. put the sensor into the original housing (5 min job). The car feels a 100kw stronger.

How long ago was that? I also phoned Goldwagen gave them the part no. (surely the part no. will be the same regardless of car brand) they quoted me close to R3000 each.

*EDIT*

Now that you mention the housing, that price might've been for the whole assembly incl. the housing. Did you get your part no. from the sensor itself?

Also, when I drove the car today with the borrowed MAFs, the power felt more or less the same, it just behaved better

I bought the VW one with the housing (bosch part number 0280218002) no more than a month ago to use in the 7 series. The actual sensor part number is 00c2g2032 (but you can't buy that separately).

 

[Eon]

When the ECU senses a faulty sensor it reverts to a default map which will reduce power slightly and fuel consumption will increase, it won't go into limp mode or throw an EML light unless it picks up a major fault in the system.

yup...thats the scenario on the 7 at this stage (MAF)

Replace with the VW one. I picked one up at goldwagen for R1700. put the sensor into the original housing (5 min job). The car feels a 100kw stronger.

How long ago was that? I also phoned Goldwagen gave them the part no. (surely the part no. will be the same regardless of car brand) they quoted me close to R3000 each.

*EDIT*

Now that you mention the housing, that price might've been for the whole assembly incl. the housing. Did you get your part no. from the sensor itself?

Also, when I drove the car today with the borrowed MAFs, the power felt more or less the same, it just behaved better

I bought the VW one with the housing (bosch part number 0280218002) no more than a month ago to use in the 7 series. The actual sensor part number is 00c2g2032 (but you can't buy that separately).

Strange, I wonder why the part number would differ from this one? It's a BOSCH part also.

Mfg Part # 13621433566
http://www.ecstuning.com/BMW-E39-M5-S62_5.0L/Engine/Intake/ES2083318/

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^^ That's the part number I gave Goldwagen

 

[jcwdrop]

yup...thats the scenario on the 7 at this stage (MAF)

Replace with the VW one. I picked one up at goldwagen for R1700. put the sensor into the original housing (5 min job). The car feels a 100kw stronger.

How long ago was that? I also phoned Goldwagen gave them the part no. (surely the part no. will be the same regardless of car brand) they quoted me close to R3000 each.

*EDIT*

Now that you mention the housing, that price might've been for the whole assembly incl. the housing. Did you get your part no. from the sensor itself?

Also, when I drove the car today with the borrowed MAFs, the power felt more or less the same, it just behaved better

I bought the VW one with the housing (bosch part number 0280218002) no more than a month ago to use in the 7 series. The actual sensor part number is 00c2g2032 (but you can't buy that separately).

Strange, I wonder why the part number would differ from this one? It's a BOSCH part also.

Mfg Part # 13621433566
http://www.ecstuning.com/BMW-E39-M5-S62_5.0L/Engine/Intake/ES2083318/

---

^^ That's the part number I gave Goldwagen

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The difference is logical. That's the housing part number. Assuming the 740 and the M5 use the same actual sensor you have to find the part number of the sensor, not the housing.

 

[rodga]

All manufacturers have the own numbering system, so the same part will have different part numbers if you buy it from VW or BMW.

 

[E63AMG]

The car has CA Automotive software on it, and is ex Joburg. I live in Cape Town.

FWIW, the car does not have CA software on it. Before I sold it, I changed the software to an Xcede remap. My consumption improved massively after that.

Poked Mafs make a huge difference from what I remember with An1mosity's car.

 

[Eon]

The car has CA Automotive software on it, and is ex Joburg. I live in Cape Town.

FWIW, the car does not have CA software on it. Before I sold it, I changed the software to an Xcede remap. My consumption improved massively after that.

Poked Mafs make a huge difference from what I remember with An1mosity's car.

What do you mean with 'poked' ? Also, was that Xcede map not designed for reef altitude? I know you get a software map from Evolve designed to bypass the MAFs altogether (Alpha N). If these sensors fail so easily I might as well get one of those.

 

[E63AMG]

The car has CA Automotive software on it, and is ex Joburg. I live in Cape Town.

FWIW, the car does not have CA software on it. Before I sold it, I changed the software to an Xcede remap. My consumption improved massively after that.

Poked Mafs make a huge difference from what I remember with An1mosity's car.

What do you mean with 'poked' ? Also, was that Xcede map not designed for reef altitude? I know you get a software map from Evolve designed to bypass the MAFs altogether (Alpha N). If these sensors fail so easily I might as well get one of those.

A poked MAF sensor is one that is broken. MAFs failing is just another common problem on the E39 M5's I'm afraid...
The Xcede map was definitely for JHB altitude. Phone Sherwin and see what he'll do for you regarding a CTN map perhaps.