PeachParts Mercedes-Benz Forum - View Single Post - Replace fuel injectors and air intake boot, cannot get stable idle.

Rahulio1989300E · #11 01-17-2011, 08:31 PM

I am not able to get the duty cycle to stop working its way to 92.3%.

Nothing I do with the 3mm hex screw at the tower is changing anything.
(I push down with the hex key, feel it hit the screw underneath, engage it and then turn.)

The car runs decent now, but the idle quality is crappy.

I retested the oxygen sensor.
Results:

Heat coil resistance: 6.1 ohms.
(Tested by plugging in the red probe of DMM into one side of heater wire connector and black probe into other side of heater wire connector.)

Sensor signal at key position 2: 0.498V
(Tested by putting red probe into oxygen sensor signal wire connector, black probe to lightly sanded seat bolt for ground.)

Sensor signal at engine start: starts at around 0.5, works its way to near 0V.
I started the car, engine was in open loop as it was cold, oxygen sensor almost immediately started working its way lower in voltage reading. Took about 1 full minute to hit about 0V. (0.05ish) What I found to be weird is that even if I revved the engine, it would not budge much from 0V, maybe went to 0.1V once. Either this sensor is bad already (10K miles) or my car is running EXTREMELY lean.