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  #1  
Old 09-21-2003, 11:00 PM
Newbie Benz Driver
 
Join Date: Dec 2002
Location: Between Oakland and Vallejo, CA
Posts: 253
is this normal?

II checked my EHA duty cycle, i get
30.2% key on, engine off
50.3% at idle
anywhere from 30-49% with throttle open
could i have a bad mass air pot?
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  #2  
Old 09-22-2003, 02:42 PM
MrCjames's Avatar
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Join Date: Jun 2003
Location: SF Bay Area
Posts: 599
if it is fixed at 50% during idle operation you may want to consider an O2 sensor.
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  #3  
Old 09-22-2003, 08:20 PM
Newbie Benz Driver
 
Join Date: Dec 2002
Location: Between Oakland and Vallejo, CA
Posts: 253
The O2 was replaced in 2000, could it be bad now?
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  #4  
Old 09-23-2003, 11:48 AM
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yal yal is offline
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Join Date: Oct 1999
Location: New York, Long Island
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Disconnect the O2 and give us the readings then.
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  #5  
Old 09-24-2003, 09:10 PM
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Join Date: Dec 2002
Location: Between Oakland and Vallejo, CA
Posts: 253
will do this weekend.
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  #6  
Old 09-25-2003, 04:59 AM
azhari
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nthach

Are you sure you're getting 30% key-on, I think it's 70% on Federal cars and Euros (like mine).

Did you use a regular digital multimeter with the formulae or did you use one with a duty-cycle function?

Fixed 50% idle when warm indicates O2 sensor inactive.

If the duty cycle remains fixed at 50% when the car is warm, check the O2 sensor.

The duty cycle should fluctuate once the car is warm if the O2 sensor is working.

Cheers.
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  #7  
Old 09-25-2003, 11:44 AM
Newbie Benz Driver
 
Join Date: Dec 2002
Location: Between Oakland and Vallejo, CA
Posts: 253
Quote:
Originally posted by azhari
nthach

Are you sure you're getting 30% key-on, I think it's 70% on Federal cars and Euros (like mine).

Did you use a regular digital multimeter with the formulae or did you use one with a duty-cycle function?

Fixed 50% idle when warm indicates O2 sensor inactive.

If the duty cycle remains fixed at 50% when the car is warm, check the O2 sensor.

The duty cycle should fluctuate once the car is warm if the O2 sensor is working.

Cheers.
Yea, i got 30% key on/engine off(deadhead). I used a Sears multimeter with the duty cycle function.
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