Egr and MAF?

biffa75 · 4th November 2021, 05:06

Our recently purchased 75 tourer 131cdti has at some point in its past had the egr blanked off with a kit.

It's a stainless steel kit fitted, with the egr exhaust pipe removed and a blanking plate fitted at the rear of the engine. And the one of the two vacuum? Type pipes a blue one has been plugged off.
The stainless steel section that bolts to the inlet.manifold has no ports or anything on it like the original.

Question I have is, the MAF is unplugged, not sure why, I have no idea if the car has been remapped at present time. I do however have a good confirmed working second hand Bosch MAF

Question I have is, has the MAF been unplugged because of the egr or should it still be plugged in even with the egr removed?

Thanks
R

Arctic · 4th November 2021, 08:58

Quote:

Originally Posted by biffa75

Our recently purchased 75 tourer 131cdti has at some point in its past had the egr blanked off with a kit.

It's a stainless steel kit fitted, with the egr exhaust pipe removed and a blanking plate fitted at the rear of the engine. And the one of the two vacuum? Type pipes a blue one has been plugged off.
The stainless steel section that bolts to the inlet.manifold has no ports or anything on it like the original.

Question I have is, the MAF is unplugged, not sure why, I have no idea if the car has been remapped at present time. I do however have a good confirmed working second hand Bosch MAF

Question I have is, has the MAF been unplugged because of the egr or should it still be plugged in even with the egr removed?

Thanks
R

Hi Robert.
The MAF as been unplugged for two reasons only, one that is as a mafless MAP or the MAF it's self is not working as it should so as been unplugged.

Yes the MAF should be plugged in no matter if you have a bypass EGR or not.

Plug it back in and see if the car goes into limp mode if so then it's faulty, use your good one instead.

Robson Rover Repair · 4th November 2021, 20:11

Or 3rd reason. Its had a mafless remap.

biffa75 · 4th November 2021, 21:41

Thanks for the info guys,

I did try and plug it in and well, airbox has to be taken off and decided to just leave it for now. I have no idea whether it has had a remap and if it has, if it's had a mafless remap. Any way of finding out without the use of t4?

Thanks
Rob

Arctic · 4th November 2021, 21:48

Quote:

Originally Posted by Robson Rover Repair

Or 3rd reason. Its had a mafless remap.

Hi Colin that was my first reason

Arctic · 4th November 2021, 21:54

Quote:

Originally Posted by biffa75

Thanks for the info guys,

I did try and plug it in and well, airbox has to be taken off and decided to just leave it for now. I have no idea whether it has had a remap and if it has, if it's had a mafless remap. Any way of finding out without the use of t4?

Thanks
Rob

Hi Rob.
It is not an hard job to remove the air filter cover.

https://www.the75andztclub.co.uk/for...d.php?t=200016

PS can you not ask the last owner if he knows if it as had an upgrade MAP

You could do the mod to the cover which will help if you ever have to remove the MAF again.
https://www.the75andztclub.co.uk/for...d.php?t=307029

DMGRS · 5th November 2021, 08:42

I found similar on my latest 75 - MAF unplugged but no obvious clues as to why.
The reason became pretty clear when I plugged it back in, and the car would barely reach 3,000RPM even out of gear!

It's most likely a dead MAF as mentioned - I'd see how she behaves with it plugged in.
If faulty you'll find all 'pull' between idle and 2,250RPM or so has completely disappeared.

biffa75 · 5th November 2021, 16:14

Thanks for the comments, I'll give it a try this weekend.

I couldn't remove the air box top cover the other day as I was running out of daylight.
And needed the car that night before work. I'll give it a go this weekend and see what happens.

If like robson rover repair has stated "mafless map" would plugging the MAF in cause an issue? As I say, I have very little paperwork for the car and unsure whether it may have been remapped at some point in its past.

I aren't able to make contact with any previous owner ( I did post a thread.in this very forum but no response).

4th November 2021, 05:06	#1
biffa75 Trader Mk1 2004 tourer cdti + MK1 2003 Saloon CDT Join Date: Nov 2015 Location: west yorkshire Posts: 494 Thanks: 106 Thanked 91 Times in 57 Posts	Egr and MAF? Our recently purchased 75 tourer 131cdti has at some point in its past had the egr blanked off with a kit. It's a stainless steel kit fitted, with the egr exhaust pipe removed and a blanking plate fitted at the rear of the engine. And the one of the two vacuum? Type pipes a blue one has been plugged off. The stainless steel section that bolts to the inlet.manifold has no ports or anything on it like the original. Question I have is, the MAF is unplugged, not sure why, I have no idea if the car has been remapped at present time. I do however have a good confirmed working second hand Bosch MAF Question I have is, has the MAF been unplugged because of the egr or should it still be plugged in even with the egr removed? Thanks R

4th November 2021, 20:11	#3
Robson Rover Repair NI/ROI RS ZT-T 190 / 75 Diesel x3 / 6 door limo / 216 Cabby / Rover 25 van Join Date: May 2009 Location: Antrim Posts: 8,101 Thanks: 299 Thanked 1,046 Times in 568 Posts	Or 3rd reason. Its had a mafless remap. __________________ Cheers, Colin Robson Rover Repair on Youtube DISCOUNTED MTEC BRAKES FOR ALL MG ROVER'S Braided hoses, more coating and pad options for 2024

5th November 2021, 08:42	#7
DMGRS Discount MG Rover Spares Rover 75 CDTi, 2x MG ZS180 Join Date: Jun 2011 Location: Hythe, Southampton Posts: 11,320 Thanks: 456 Thanked 3,377 Times in 2,027 Posts	I found similar on my latest 75 - MAF unplugged but no obvious clues as to why. The reason became pretty clear when I plugged it back in, and the car would barely reach 3,000RPM even out of gear! It's most likely a dead MAF as mentioned - I'd see how she behaves with it plugged in. If faulty you'll find all 'pull' between idle and 2,250RPM or so has completely disappeared. __________________ Your trusted MG Rover specialist! Tel: 02380 001133 / Email: [email protected] We now have a 'chat' function on our site for even quicker replies. Give it a try! Remember - discount code FORUM5 for 5% off

4th November 2021, 21:41	#4
biffa75 Trader Mk1 2004 tourer cdti + MK1 2003 Saloon CDT Join Date: Nov 2015 Location: west yorkshire Posts: 494 Thanks: 106 Thanked 91 Times in 57 Posts	Thanks for the info guys, I did try and plug it in and well, airbox has to be taken off and decided to just leave it for now. I have no idea whether it has had a remap and if it has, if it's had a mafless remap. Any way of finding out without the use of t4? Thanks Rob

5th November 2021, 16:14	#8
biffa75 Trader Mk1 2004 tourer cdti + MK1 2003 Saloon CDT Join Date: Nov 2015 Location: west yorkshire Posts: 494 Thanks: 106 Thanked 91 Times in 57 Posts	Thanks for the comments, I'll give it a try this weekend. I couldn't remove the air box top cover the other day as I was running out of daylight. And needed the car that night before work. I'll give it a go this weekend and see what happens. If like robson rover repair has stated "mafless map" would plugging the MAF in cause an issue? As I say, I have very little paperwork for the car and unsure whether it may have been remapped at some point in its past. I aren't able to make contact with any previous owner ( I did post a thread.in this very forum but no response).