97. e300 td.the MAF puzzle ?

[HERBIEMERCMAN]

hi everyone, i fitted a second bosch maf today, brand new just like the last one two weeks ago, part number: A 611 094 00 48. made in stuttgart. same thing happens, with maf fitted the engine jerks and plucks runs terribly, starts and ticks over ok. when the maf is disconnected the drive is smooth, gear changes ok, good starting, tick over etc. all be it there is a vast reduction of power, it's like a one litre not a three litre but it is driveable, unlike the situation with the maf connected. so if the maf's are ok, and i think i have proved this by fitting two, then what runs better without the maf than with it ? i have sent a message to dieselman but he may not see it for a while, does anyone else have any ideas to what could be happening ? i am returning to my inde and maf supplier next week and i would like to have some idea of how the engine management works. herbiemercman.

 

[Xtractorfan]

Have you checked the part number and make with MB ..its possible you may be fitting the wrong MAF..just a suggestion..

 

[television]

The MAF does nothing at idle on your car,so this leaves the running question. I will give some thougt to it when I go to sleep

 

[HERBIEMERCMAN]

thanks for response xtractor & malcolm, will check part number of maf, if this is the problem it will compromise the credability of my inde, and i like him. when i made the visit he said that the maf i had fitted for the past 5 yrs was a petrol one ? the two new ones look completely different. he has worked on mercs for 10 yrs. and seems confident in fixing the problem, but from comments on several other indes etc, they do their best but some problems must be difficult to solve and may be part changing is what people resort to, this company has lots of parts. herbiemercman.

 

[roofless]

have a look at No122 third pic down http://www.detali.ru/cat/oem_mb2.as...GA=722.608&CT=M&cat=19T&SID=09&SGR=015&SGN=01

 

[HERBIEMERCMAN]

thanks roofless, the diag. part looks like the original maf i had for 5 yrs, it also looks just like the one fitted to parrot of doom's car seen in his excel. article. the part number from the diag. is 0000941248, the part number on the two mafs i have is A6110940048.pierburg germany. may be i have been playing the oesterich a bit, i just cannot believe an inde expert can get such a simple thing wrong. could the pierburg have a different number and different shape etc. ?, i doubt it. can't wait to make further enquires on monday with my local mb dealership and the maf company in kent. herbiemercman.

 

[HERBIEMERCMAN]

hi everyone, just found out that my inde from oldham sent me the wrong mafs, he said the ones he sent me fitted most mercs including the vans, and they have a different one for petrol cars ? i was flabergasted, it was like telling a dentist how to take a tooth out. i explained how the maf works and that the exact electrical / electronic charachteristics have to be correct. i gave him the correct part number 0000941248, which is the part number i got from main dealer this morning, it is also the same number kindly supplied by roofless mb club member. i am skeptical of my inde sending me another maf, all be it he has the tech info i gave him, i feel the company are good for second hand parts, good delivery etc. which is my experience of the past years, but for service , tech. ability this situation with the maf has removed their credability. i will now source a maf from the company in kent which was reccomended by malcolm (televisionman). thanks again everyone for your help to date. i will let you all know what happens next in due cource. herbiemercman.

 

[television]

Be sure after all this Herbie that the MAF that they supply is a Bosch part, they cost £145 from Bosch service centers

 

[Autofix]

In my experience, Pierburg MAF's only work on petrol manual trans Mercedes and then only if the correct one. Hella are another to be avoided. Bosch every time for me.

 

[television]

In my experience, Pierburg MAF's only work on petrol manual trans Mercedes and then only if the correct one. Hella are another to be avoided. Bosch every time for me.

I need to get my hands on some faulty ones so that I can see if a new sensor can be fitted to them

 

[Autofix]

It shold be easy enough to get faulty ones. Repairing would be a different matter. The signal is so critical that even being slightly out can cause problems. I think you would need a flow bench to check them. Bosch claim to calibrate each one to the body.

 

[television]

OK so once I get a few faulty units I could fix up a test bench, just an idea at the moment

 

[HERBIEMERCMAN]

97 E-300 Td Maf Problem Solved.

hi everyone, the maf problem ended today, the third one from my inde was the correct part number, second hand, but cired the maf function problem, however as my inde pointed out in the beggining the car is generally down on power, and it still is. with the original maf and the two incorrect mafs the car runs terribly, this is now resolved, but it's like the turbo is not working , no power, good starting, good tick over, smooth running, good gear changing, a gentle driver would not know there was anything amiss untill they wanted to overtake, you get the revs but no power ? could it be the turbo relief valve stuck open ? any suggestions much appreciated. herbiemercman.

 

[Autofix]

It could still be a MAF problem. A used one may be better than what was in it but could still be slightly faulty.