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Old 06-30-2011, 04:42 PM
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Join Date: Oct 2006
Location: Indian Waters, Florida
Posts: 136
Rough idle

'91 420 SEL. Was performing the trouble tree test and only got as far as the static test (engine off, switch on) for duty cycle.
At the X11 plug (pin 2 &3) mine reads 30% @ +3.4 Volts. I was expecting to see the 49 state 70%.
Nothing in the rest of the document says what to do if it isn't 70% at the git-go.
With the engine running it jumped around between 64-75% and within 10% at 2500 rpm. Which according to Landiss is what it should be and the O2 sensor is working.
Just curious about only seeing 30% static. Don't know what that is indicative of. Of course reversing the leads I get 70% @ -3.4V.

TIA, Dave

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