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  #1  
Old 08-26-2003, 10:42 PM
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190e Air flow meter plate. can anyone tell me whats under there?

after going thru the resistance test of the air flow meter i no longer have play in the plate with the engine off. is there a spring under there somewhere that might have jumped off? is it safe to remove the plate to look? still searching for lack of power/low vac problem on my 1988 190e. any info/ direction would very much appreciated. thanks, charlie
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  #2  
Old 08-27-2003, 02:04 AM
jlam
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I have the same problem with my 260E. I had it checked and the result was, the black electronic box at the side of the airflow meter assembly was faulty.
About your question, what's under the plate? There is a spring attached to the arm connected to the circular thing that opens on top of the assembly for air. When you open it, there's no need to worry cause it's mechanical. The only thing you should worry about is the black box attached to it cause I learned that it is calibrated so tampering with it is a no-no.

Good Luck!


Cheers,

jlam
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  #3  
Old 08-27-2003, 11:44 AM
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Plagiarized from an old post:
Attached Thumbnails
190e Air flow meter plate. can anyone tell me whats under there?-air-mass-sensor.jpg  
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  #4  
Old 08-27-2003, 09:50 PM
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THANKS MR. SBOURG dor tihi beatifull picture.

Please. Is the MASS SENSOR the whole metal piece including the plate.?

How to test and calibrate the AIR MASS POTENTIOMETER?

MARIO FARIAS
laprefar@cantv.net
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Old 08-27-2003, 10:03 PM
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thanks Sbourg for the great pictures. i can see a gear type device between the plate and the spring. possibly that jumped a tooth when i depressed it all tha way down. guess i will have to pull the assembly and look. from the apperance its not too hard to do.
THANKS again. i will post my results.
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  #6  
Old 08-27-2003, 10:06 PM
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THANKS also to Jlam for giving me the courage to attempt this.
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  #7  
Old 08-28-2003, 12:45 AM
djjeant
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im also about to replace the air mass sensor, i took it out and there where two variable resistors, they look like two arched black lines, two metal small plates that move through the black lines, and one of the black lines on my air mas sensor is already lookning wasted, and its causing my car to surge eveon on deacceleration and sometimes the idle rises and you know what all that come with csi injection, im swaping mine tomorrow i marked the position of the old one by carving a line around the old afm.

how did you guys figure out yours was faulty?
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  #8  
Old 08-28-2003, 11:18 AM
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"Please. Is the MASS SENSOR the whole metal piece including the plate.?"

Yes. The electronic module on the side is the potentiometer. For more detail on that, with pics, look at this post:

Aiflow meter pot source - Bosch CIS

Steve
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  #9  
Old 08-28-2003, 10:29 PM
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what i thought was a spring off turned out to be a bind in the air flow plate. i was able to adjust the plate to clear the housing. however, my air flow pot does not appear to be worn but the resistance varies up and down as i depress the plate. it bounces up and down as it climbs. is that normal? ( i'm useing a digital meter)
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  #10  
Old 08-29-2003, 03:27 AM
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If you checked its condition visually, that is probably adequate.

You cannot get an accurate indication using an ohmmeter. The way to test it out of circuit is to apply a voltage across the outside terminals, and monitor the voltage on the wiper pin as the plate is moved. This is best done with a high-impedance analog meter and bench power supply, not generally in most garages.

Or, monitor the voltage in-circuit with the engine running. The voltage should be steady at a steady rpm, and about 0.7V at low idle.

Steve
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  #11  
Old 08-31-2003, 08:38 PM
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at idle my air flow pot reads about .7v. valve timing marks line up correctly indicating no chain stretch. disconnecting my exhaust manifold makes no change in my vac. reading. compression reads about 185 psi. timing is about 6 degrees btdc. (changing trim resistors appears to make no difference.) i have blocked each vac. port one at a time but my vac stays about 15 inches instead of 20. engine has low power as if the cat. convert. is clogged but it doesn't have one. i'm out of ideas. anyone have a suggestion? thanks, charlie
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  #12  
Old 09-01-2003, 06:43 PM
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just saw a post that said low vac/power problem was fixed by INSTALLING a cat converter. maybe THATS my problem.
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  #13  
Old 09-03-2003, 12:35 PM
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removal

Could you describe removal & installation, as I want to replace the one in my 87 300e with one from a 91 300e. I'd also like to swap the fuel distributor at the same time, since they seem to be connected. Can this be done together? Thanks.
Rich
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  #14  
Old 09-03-2003, 01:09 PM
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In our 190E, remove the injector lines, the EHA and potentiometer connectors, the pressure regulator, and all other fuel lines that connect to the fuel distributor. Loosen the clamp at the throttle body. Remove the bolts attaching the airflow sensor to the intake manifold runners, and lift off the airflow sensor / fuel distributor assy as a unit, disconnecting the idle air valve inlet line as it becomes accessible. Keeping the two bolted together should help minimize tedious setup procedures.

This is a good time to replace all the rubber hoses in the idle air / breather system, as well as the rubber lower plenum of the airflow sensor - if they have age hardening.

Steve
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  #15  
Old 09-03-2003, 02:50 PM
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Thanks, Steve. Once installled, do I reset the CO mixture or should the fuel distributor retain its settings from the previous car, which ran great.
Rich
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