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Old 04-20-2004, 10:10 AM
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Join Date: Sep 2003
Location: Norway
Posts: 12
EHA-current / O2 / Duty-cycle readings (M103) - please check

I have some problems with hesitation during acceleration (not with full throttle) on my 90 260E (M103).
With small movemments with the pedal (more throttle), I get large variations in power up and down.
Feels like something holds back and then let go several times during one acceleration.

I have tested this:

Current at EHA: fluctates around 0mA (warm) and 19,5mA when ignition on / enigne off.

When I disconnect the O2-sensor (lambda) i measure about 0,8 volt. Should not this value be lower?

Duty-cycle readings fluctates around 47-52 %.

O2-sensor new january 2004.
Any comments on the readings, suggestions for further test-steps or possible couses are appreciated.


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Old 04-20-2004, 01:18 PM
Super Moderator
Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Those are good readings.

Can you drive the car and watch the enrichment /EHA current as you accelerate and experience the problem?
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 04-21-2004, 02:34 AM
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Join Date: Sep 2003
Location: Norway
Posts: 12
Hmm, then I have to use a cable, I'll see what I can do.
It will be easiest to use the duty-cycle then I think.


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