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  #1  
Old 04-06-2012, 03:02 PM
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Early W124: Is the EHA active during cold starts?

1989 300E

Should the EHA be controlling anything during cold starting? I'm trying to track down a running issue. It'll start cold (reluctantly) surge a few times and stall. If I touch the gas pedal, it'll stall. My plugs tell me I am running rich. It all started when I adjusted the EHA to try to remedy low end power issues. It started missing on #3, so I adjusted it back to no avail. Any help would be much appreciated. Thanks!

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Old 04-06-2012, 04:25 PM
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Also, while building an EHA test harness, I need to be able to test MA to ONE pole, right? As in, one pole has normal continuity, and the other runs through the meter to measure, right?
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Old 04-06-2012, 05:05 PM
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Nope, EHA controls enrichment above 2500rpms, only.

Check O2 Sensor, Vacuum Leaks, and Air Flow Potentiometer.
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Old 04-06-2012, 05:06 PM
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EHA can affect cold start and bottom end power if not adjusted right unfortunately.
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Old 04-06-2012, 06:07 PM
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Check your OVP relay behind the battery. If the fuse is blown, it's no good. You can put a new fuse in to check it, but that's not a good permanent fix/ Replace it with a new one if it's bad.

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