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Old 09-28-2007, 06:24 AM
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Join Date: May 2006
Location: Dubai
Posts: 108
Fitting new air flow sensor - is it just a bolt on?

Hi guys,

Its time to replace my air flow sensor on my 190E 2.5-16. That is the big metal thing with the round dome plunger.
My question is, is it straightforward? I mean do i just take the old one off and bolt on the new one? Do i have to adjust anything? I know i have to change the the little tower that you adjust the C/O mixture with.
Or would i be better off taking it to a bosch specialist who have all the tools?
Any advice would be really great! Thanks

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Old 09-28-2007, 09:02 AM
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Join Date: Jul 2001
Location: SoCal
Posts: 1,303
"It's time"? .... Not sure what your symptoms are, but not much goes wrong with this item other than a worn potentiometer. Is it symptoms of that failing that you experience? On the other hand, plugging-up, leaking, uneven distribution, etc of the fuel distributor, or problems with the EHA are more common.

Anyway, if you replace the airflow meter, you will have to calibrate the mechanical offset of the vane, as well as the pot position. If none of the rubber in the vicinity has been replaced recently, I would include that too.

'91 MB 190E 2.3
'08 RAV4 Ltd 3.5
'83 Lazy Daze m'home 5.7
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Old 09-28-2007, 12:58 PM
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Join Date: May 2006
Location: Dubai
Posts: 108
Thanks for the reply. Yep my pot is worn out. Im assuming that they come pre-adjusted from Mercedes. This is an original new one from MB.
Rubber boot is new.
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Old 09-28-2007, 07:12 PM
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Join Date: Dec 2000
Location: AL
Posts: 1,219
The pot used to be available separately.

Look hard and you may find one.
2012 E350
2006 Callaway SC560
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Old 09-29-2007, 02:16 PM
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Join Date: Mar 2001
Location: Decatur, Illinois, USA
Posts: 616
From what I can tell the meter's plunger movement and adjustment has to be made after it is installed, manual shows adjustments and they dont look fun to me and I like DIY projects. For something that crutial to proper operation of so many other sytemss I would have a MB Bosch mech do it, probably not the dealer, but a good Bosch indy. I replaced the fuel distrib on a 90 190E and it involved plunger adjustments that were detailed and crutial to operation

Christopher Henkel
1990 190E 2.6 - Arctic white SOLD
1986 190E-16v - Blauswartze
1993 300CE - SOLD
2003 W208 CLK 320 Cabriolet - Magma Red
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