After correcting my CO adjustment a month ago everything was working just fine until a week ago when I noticed the engine was hard to start, hot or cold, and a slight rough idle as well. I decided to check my duty cycle reading again this evening and found it to be sitting at 92% flat!! Fortunately it is not running that lean, I can tell by the smell of the exaust. Is this a trouble code? I have tested the battery voltage, the OVP relay, the EHA and the idle air valve,,,, All of these seem to be functioning properly. What else should I be looking at??? Your suggestions will be greatly appreciated.
Thanks!
Adam

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Current Stable:
01 ML55 AMG
92 500E (a few mods)
87 300E (lots of mods)
00 Chevy 3500HD Diesel Box Truck
68 18' Donzi Marine
06 GT i-Drive7 1.0 Mountain Bike (with GPS!)

PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320