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  #1  
Old 06-16-2003, 11:29 AM
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Duty cycle/EHA current , 2 pictures from meters

Top meter is EHA current and red meter is duty cycle. Duty cycle was jumping between 78 and 94%.
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Duty cycle/EHA current , 2 pictures from meters-duty1.jpg  
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Old 06-16-2003, 11:30 AM
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This is with the o2 sensor unplugged. Any one know what this means?
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Duty cycle/EHA current , 2 pictures from meters-duty2.jpg  

Last edited by Cap'n Carageous; 06-16-2003 at 11:47 AM.
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Old 06-16-2003, 12:10 PM
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Your camera needs new batteries because it's taking too long for the flash to charge? Just kidding

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Old 06-16-2003, 12:13 PM
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What car? Is this at idle, and if so, was the idle speed steady and what was the rpm?

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Old 06-16-2003, 12:16 PM
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well the eha is reading a rich reading while the other is reading lean what i did was adjust the mixture screw to maiting a little rich reading at idle and at 2000rpm the other meter to read no more than65% you will notice taking impresive throttle respond no more lagging taking off
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Old 06-16-2003, 12:19 PM
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89 3ooe M103 @ 2000 RPM (same readings at idle). I adjusted the mixture screw until it killed the engine, but it didn't change the readings.
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Old 06-16-2003, 12:25 PM
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i re read the post you said 02 disconnected if so then it should of went to 50% and eha to lean
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Old 06-16-2003, 12:35 PM
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I want one of those multimeter units,but I do not have the slightest idea how to use one. Are they that complicated to use??
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Old 06-16-2003, 12:43 PM
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I can't read the second picture, but if the O2 sensor is disconnected the eHA should go to 0.0ma and the duty-cycle to 50%.

The first picture denotes a rich mixture from the EHA current of minus 3ma. The duty-cycle is backwards or the polarity is backwards. A 68%duty-cycle would indicate a lean mixture.
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Old 06-16-2003, 01:23 PM
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The first picture denotes a rich mixture from the EHA current of minus 3ma. The duty-cycle is backwards or the polarity is backwards. A 68%duty-cycle would indicate a lean mixture.

steve is this normal my car shows. it that way too
rich reading at eha and lean on dutycycle
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  #11  
Old 06-16-2003, 01:41 PM
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Duty cycle represents a point of view. Sixty-eight percent on duty cycle is the same as 32% off duty-cycle. Most meters have switches that invert the readings. If the EHA is right (the way to tell this is the key on engine off current. it will always be positive) then the duty cycle should be reversed for convention.
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Old 06-16-2003, 02:00 PM
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I turned the camera flash off for the second picture, should've left it on! The meter readings for the second picture are almost identical to the first. So, no change when o2 sensor was unplugged. As I said, the duty cycle bounced from 94 to 78, actually spending more time at 94%. So, if it's that lean where's the gas going? 12 miles per gallon. Cold start injector is plugged off. EHA (or anthing else for that matter) is not leaking externally.
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Old 06-16-2003, 02:14 PM
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Cap'n,
are you sure that you disconnected the 02 sensor?
You might have disconnected the heater wire or some other thing but not the 02 sensor.
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  #14  
Old 06-16-2003, 02:49 PM
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I disconnected both the heater and the sensor.
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  #15  
Old 06-16-2003, 04:06 PM
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All that matters is the EHA current. The duty-cycle is only an easy way to see a similar representation of closed loop control.
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