CDTI Mafless remap, maf reconnected

peelaaa · 7th March 2023, 20:14

Hi,

If the car has a mafless remap, can the maf be reconnected or will it be throwing all sort of wrong readings and the engine wont run right?

Jamiewelch · 8th March 2023, 07:40

It will be fine, it will just use the maf values instead of assuming default values. Just make sure its a new genuine bosch maf.

peelaaa · 8th March 2023, 07:46

Thanks. It was smoking a little, but with maf reconnected, no smoke

CivilSteve · 10th March 2023, 17:39

If it's true MAFless then it'll use the MAP sensor to control smoke so it shouldn't need the MAF plugging in.

Most tuners just use the default assumed values when the MAF is unplugged and call that MAFless even though it's not operating any different to unplugging it on a stock car.

It's worth checking the live data values of the MAF sensor when it's plugged in to see if it's out of scope before spending any money on replacement units.

7th March 2023, 20:14	#1
peelaaa Posted a thing or two 75 cdti 2004 contemporary Join Date: Apr 2008 Location: meath Posts: 1,551 Thanks: 272 Thanked 80 Times in 58 Posts	CDTI Mafless remap, maf reconnected Hi, If the car has a mafless remap, can the maf be reconnected or will it be throwing all sort of wrong readings and the engine wont run right?

8th March 2023, 07:40	#2
Jamiewelch Posted a thing or two Alpina D3 Join Date: Sep 2014 Location: Cheslyn hay Posts: 1,005 Thanks: 58 Thanked 294 Times in 227 Posts	It will be fine, it will just use the maf values instead of assuming default values. Just make sure its a new genuine bosch maf.

8th March 2023, 07:46	#3
peelaaa Posted a thing or two 75 cdti 2004 contemporary Join Date: Apr 2008 Location: meath Posts: 1,551 Thanks: 272 Thanked 80 Times in 58 Posts	Thanks. It was smoking a little, but with maf reconnected, no smoke

10th March 2023, 17:39	#4
CivilSteve Avid contributor MG ZT Join Date: Oct 2017 Location: Manchester Posts: 237 Thanks: 20 Thanked 108 Times in 56 Posts	If it's true MAFless then it'll use the MAP sensor to control smoke so it shouldn't need the MAF plugging in. Most tuners just use the default assumed values when the MAF is unplugged and call that MAFless even though it's not operating any different to unplugging it on a stock car. It's worth checking the live data values of the MAF sensor when it's plugged in to see if it's out of scope before spending any money on replacement units.