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  #1  
Old 03-01-2009, 02:27 PM
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Location: Southern California
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EHA calibration

To my understanding, adjusting the EHA properly requires checking the difference in fuel pressures between upper and lower chambers and that difference is 0.4 bar?

also, at idle the EHA should be pulling 0 mA of current?

what do I do to set up the test to check the fuel pressures? what tools do I need and how do I set this up?

what harness are people getting to test the EHA valve currents?

my current method of setting the mixtures with lambda tower and EHA are just manual calibration based on reading duty cycle and I've narrowed it to around 45% at idle and 50% at 2500RPM no load. the car runs better than before, but I want to make sure I have the EHA perfect.

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  #2  
Old 03-01-2009, 02:48 PM
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First use a CIS tool to measure the main pressure. Then use that tool to measure the difference of .4 bar
Next use an ammeter to measure the current draw to the EHA. To do this, disconnect the EHA harness then connect one pin of the EHA to one side of the harness while you stick the ammeter between the other side of the harness connector to the other EHA pin. ZERO + or - 1mA will be acceptable.
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Old 03-01-2009, 02:54 PM
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a CIS tool? could u be more specific? is there something I can pick up at a sears or something? I have a fuel pressure/vacuum gauge reader but I dont see any good way to hook it up to the fuel lines.

is there a special harness for the ammeter? if I am imagining it right, it seems rather difficult to measure the current without some special harness that the ammeter plugs into in series to help you read it.
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  #4  
Old 03-01-2009, 03:08 PM
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Go to my post
1988 190E 2.3 stalling
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  #5  
Old 03-01-2009, 03:09 PM
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I got mine from Harbor Freight (very cheap)
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  #6  
Old 03-01-2009, 03:15 PM
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so its just a plain old fuel pressure gauge. looks like i need to find the right hose fittings to insert into the fuel distributor.

what pressure are u measuring that picture? the lower?
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  #7  
Old 03-01-2009, 03:21 PM
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Yes, that was the lower!

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