The MAF Question .

ceedy · 9th April 2019, 08:17

Still having Faf with the MAF

I ran with MAf unplugged for a week , MPG tiny bit worse MPG @ 32ish .

Tried this other unknown history Bosch for a few days and barely got 30mpg.
Even granny driving barely got 32.

So last night I tried a Maf clean just to see if it makes any difference.
So 20 mins in my Ultrasonic Cleaner with some ISo propynol.
Popped back in started motor perfectly as usual .
Gave it a few blips to check and left it .

This morning off to work, car started up as usual, BUT no response to throttle?
then after about 15 secs motor dies .
Again Starts straight up , no throttle and then dies .

Arrgh!! minor panic.

unplug MAF and off to work no problem .
So obivously MAF ? but what going on ?

What would cause this ?

Still got my original MAF , and maybe looks like a deep pocket probing for another new one .-)

But would it make any difference on My AUTO CDTI that does about 34-35 just generally running around.

But would it really make any difference after the 100 quids ?

Chris

grivas · 9th April 2019, 12:12

Quote:

Originally Posted by ceedy

Still having Faf with the MAF

I ran with MAf unplugged for a week , MPG tiny bit worse MPG @ 32ish .

Tried this other unknown history Bosch for a few days and barely got 30mpg.
Even granny driving barely got 32.

So last night I tried a Maf clean just to see if it makes any difference.
So 20 mins in my Ultrasonic Cleaner with some ISo propynol.
Popped back in started motor perfectly as usual .
Gave it a few blips to check and left it .

This morning off to work, car started up as usual, BUT no response to throttle?
then after about 15 secs motor dies .
Again Starts straight up , no throttle and then dies .

Arrgh!! minor panic.

unplug MAF and off to work no problem .
So obivously MAF ? but what going on ?

What would cause this ?

Still got my original MAF , and maybe looks like a deep pocket probing for another new one .-)

But would it make any difference on My AUTO CDTI that does about 34-35 just generally running around.

But would it really make any difference after the 100 quids ?

Chris

lesson to observe here is the MAF cannot be cleaned satisfactorily and even if it is cleaned it will soon fail again, if disconnecting it improves matters, then replace with a a genuine Bosch.

ceedy · 9th April 2019, 15:16

yup with all the hype about Maf cleaning cans etc ..

I thought i was worth a try just to see if it helped a bit, if at all ..

Didn't expect it to kill it tho'

Wondering what could happen to a Maf make it stop the motor running .?

C.

MSS · 9th April 2019, 19:21

I am not aware of the range on MAF values used by the ECU, but given that its output informs the fueling calculations.....

Marianbrian will be able to answer your specific question.

hogweed · 9th April 2019, 22:17

Thing is, everybody here says that the MAF has a fairly minimal effect on performance, and driving with it unplugged is OK, but that’s not my experience.

When I bought my car 9 years ago, it was in excellent nick, at the right price, but felt a bit flat (like the turbo wasn’t working properly), so I decided it was worth a gamble anyway. I found the MAF unplugged, talked to people here, and fitted a new one – the performance was transformed.

Make of that what you will – but, for my car at least, the MAF seems to be crucial to performance

HarryM1BYT · 10th April 2019, 07:35

Quote:

Originally Posted by ceedy

But would it really make any difference after the 100 quids ?
Chris

If you don't mind buying genuine Bosch, but without a guarantee, then you can buy the one intended for a BMW for much less than that. You can buy the correct MAF sensor, but packaged up to fit a BMW. You simply remove the correct genuine part from the BMW casing and fit it to the 75's casing. Problem is, you then have no guarantee because you have to break the seal. The source is the MAFshop in Germany - best order it before Brexit adds any extra complications

I investigated all this a few years ago and published the results a few years ago on the forum.
https://www.the75andztclub.co.uk/for...d.php?t=195871

grivas · 10th April 2019, 08:25

Quote:

Originally Posted by hogweed

Thing is, everybody here says that the MAF has a fairly minimal effect on performance, and driving with it unplugged is OK, but that’s not my experience.

When I bought my car 9 years ago, it was in excellent nick, at the right price, but felt a bit flat (like the turbo wasn’t working properly), so I decided it was worth a gamble anyway. I found the MAF unplugged, talked to people here, and fitted a new one – the performance was transformed.

Make of that what you will – but, for my car at least, the MAF seems to be crucial to performance

It is crucial to performance, for sure crucial to correct fuelling, why else would the manufacturer have incorporated it to the fuelling system!!. Disconnecting it just sets the ECU to a default value until you replace it with a new working one.

ceedy · 10th April 2019, 09:04

Original Maf back for the Short Holiday ..

And just for info here is the Duff one with its Coverplate removed .

The Insides are covered in a flexible and Sticky Clear sealant .

Whether its normally sticky or my Isopropynol has affected it .... pass .

But not a simple little Circuit in there ..

..

Off to finish reading Harrys links/messages/investigations

But does seems this has all been done to death before in 2014..

But might need a slight revisit ?

But then my memory is getting flakey

.

But Still got to find the right MAF thats isn't a silly price and actually a Genuine one ?.

As most of the old links are dead , maybe peeps have a recommendation or 2 ?

C

HarryM1BYT · 10th April 2019, 09:48

Quote:

Originally Posted by ceedy

As most of the old links are dead , maybe peeps have a recommendation or 2 ?

There are only two guaranteed to provide an original MAF sources - the correct item for the 75 from the MAFshop, or the BMW item from the MAFshop. Any other source is a gamble.

The delicate part of the MAF which suffers damage is an extremely fine and quite exposed wire on the outside of the unit. It is too fine to see with the naked eye. Which is why it is sold already fitted in a protective housing and has a tamper seal as sold by the MAFshop, for the 75 or BMW.

Arctic · 10th April 2019, 10:13

You could try this link below, but as always double check, then check again on the MAF Shop, I am 99% sure it is the right one for the BMW part that fits our cars.

https://www.ebay.co.uk/itm/BOSCH-AIR...2/381351136629

9th April 2019, 08:17	#1
ceedy This is my second home All Trophy Blue ,ZT260#50 , ZT CDTI Auto, ZR105+ and 1.8T Firefrost spoiling the Set . Join Date: Nov 2006 Location: Nr Sherborne But in Somerset.. Posts: 6,077 Thanks: 916 Thanked 1,214 Times in 768 Posts	The MAF Question . Still having Faf with the MAF I ran with MAf unplugged for a week , MPG tiny bit worse MPG @ 32ish . Tried this other unknown history Bosch for a few days and barely got 30mpg. Even granny driving barely got 32. So last night I tried a Maf clean just to see if it makes any difference. So 20 mins in my Ultrasonic Cleaner with some ISo propynol. Popped back in started motor perfectly as usual . Gave it a few blips to check and left it . This morning off to work, car started up as usual, BUT no response to throttle? then after about 15 secs motor dies . Again Starts straight up , no throttle and then dies . Arrgh!! minor panic. unplug MAF and off to work no problem . So obivously MAF ? but what going on ? What would cause this ? Still got my original MAF , and maybe looks like a deep pocket probing for another new one .-) But would it make any difference on My AUTO CDTI that does about 34-35 just generally running around. But would it really make any difference after the 100 quids ? Chris __________________ The Three Bloo's Wifey's Zr105, MY CDTI & 260 #50 and Number One sons 1.8T in Firefrost When I were a lad Zero to 142 in 10.25 secs at the Pod on my Blown Norton. 210 Kart Champ in 70's Last edited by ceedy; 9th April 2019 at 08:21..

9th April 2019, 15:16	#3
ceedy This is my second home All Trophy Blue ,ZT260#50 , ZT CDTI Auto, ZR105+ and 1.8T Firefrost spoiling the Set . Join Date: Nov 2006 Location: Nr Sherborne But in Somerset.. Posts: 6,077 Thanks: 916 Thanked 1,214 Times in 768 Posts	yup with all the hype about Maf cleaning cans etc .. I thought i was worth a try just to see if it helped a bit, if at all .. Didn't expect it to kill it tho' Wondering what could happen to a Maf make it stop the motor running .? C. __________________ The Three Bloo's Wifey's Zr105, MY CDTI & 260 #50 and Number One sons 1.8T in Firefrost When I were a lad Zero to 142 in 10.25 secs at the Pod on my Blown Norton. 210 Kart Champ in 70's

9th April 2019, 22:17	#5
hogweed I really should get out more....... Vauxhall Insignia CDTi; MG TF 135 Join Date: Jan 2010 Location: Norn Iron Posts: 2,958 Thanks: 942 Thanked 378 Times in 297 Posts	Thing is, everybody here says that the MAF has a fairly minimal effect on performance, and driving with it unplugged is OK, but that’s not my experience. When I bought my car 9 years ago, it was in excellent nick, at the right price, but felt a bit flat (like the turbo wasn’t working properly), so I decided it was worth a gamble anyway. I found the MAF unplugged, talked to people here, and fitted a new one – the performance was transformed. Make of that what you will – but, for my car at least, the MAF seems to be crucial to performance __________________ Past cars: MGB GT; Escort 1300 Sport; Vauxhall VX4/90; Marina Coupe TC; Celica ST (1972); Montego Turbo; Astra GTE 16V; Astra GSI 16V; Golf GTI 16V (Mk II); Sierra XR4x4 Estate; BMW 325i (E30); BMW M3 3.0; BMW M3 3.2 Evo. Left some of the more embarrassing ones out. And about 30 motorbikes.

10th April 2019, 09:04	#8
ceedy This is my second home All Trophy Blue ,ZT260#50 , ZT CDTI Auto, ZR105+ and 1.8T Firefrost spoiling the Set . Join Date: Nov 2006 Location: Nr Sherborne But in Somerset.. Posts: 6,077 Thanks: 916 Thanked 1,214 Times in 768 Posts	Original Maf back for the Short Holiday .. And just for info here is the Duff one with its Coverplate removed . The Insides are covered in a flexible and Sticky Clear sealant . Whether its normally sticky or my Isopropynol has affected it .... pass . But not a simple little Circuit in there .... Off to finish reading Harrys links/messages/investigations But does seems this has all been done to death before in 2014.. But might need a slight revisit ? But then my memory is getting flakey . But Still got to find the right MAF thats isn't a silly price and actually a Genuine one ?. As most of the old links are dead , maybe peeps have a recommendation or 2 ? C __________________ The Three Bloo's Wifey's Zr105, MY CDTI & 260 #50 and Number One sons 1.8T in Firefrost When I were a lad Zero to 142 in 10.25 secs at the Pod on my Blown Norton. 210 Kart Champ in 70's Last edited by ceedy; 10th April 2019 at 09:40..

10th April 2019, 10:13	#10
Arctic Give to Learn Freelander 2 Join Date: Aug 2010 Location: West Midlands Posts: 18,725 Thanks: 1,155 Thanked 6,407 Times in 3,874 Posts	You could try this link below, but as always double check, then check again on the MAF Shop, I am 99% sure it is the right one for the BMW part that fits our cars. https://www.ebay.co.uk/itm/BOSCH-AIR...2/381351136629 __________________ Arctic Givology Learn to Give Everything is Achievable ad altiora tendo. Check out our Nano meet dates http://www.midlandsnanomeets.co.uk/ http://www.the75andztclub.co.uk/index.php?thepage=howto " You do the work , we supply the expertise "

9th April 2019, 19:21	#4
MSS This is my second home Rover 75CDT, Jaguar XF-S 3.0V6, V'xhall Omega V6 Estate, Twintop 1.8VVT, Astra Estate and Corsa 1.2 Join Date: Dec 2007 Location: Suffolk Posts: 7,085 Thanks: 283 Thanked 624 Times in 440 Posts	I am not aware of the range on MAF values used by the ECU, but given that its output informs the fueling calculations..... Marianbrian will be able to answer your specific question.