Hi, I am new to the list - thanks for helping me out. I searched the archives and found some valuable hints. Have been facing an increasing problem with my 88 Vanagon (106 kmiles) over several months now: Symptoms: Very little power, sluggish when below 2000 rpm, especially in warm climate and/or with AC on Very high idle emissions (HC close to 1000 - CO 1%), prev. years <100 No performance problems with O2 sensor disconnected (HC close to 1000) Steps taken: clean and reseat all connections: ECU, sensors, Idle control... new sparks, wires, distributor, air filter - timing tuneup new temp sensor, O2 sensor check for vacuum leaks, check idle control valve Suspects: The resistive layer of the air mass sensor shows wear by the wiper. The 'over-all' impedance is about 300 Ohms (as defined by the individual resistors), when measured on the wiper (analog meter) I see the values between 25 (closed) and 300 (open) vary all over the place - not monotonously increasing. Is this because of the high impedance of the black conductor or is the unit faulty? What should the reading be for the idle position (1/3 open)? Will a new unit require major adjustment - have not seen anything on a how-to What is the correct procedure to adjust timing for the Digifant system? - engine warm up - disconnect temp sensor - adjust at 900 rpm? I appreciate your help - need to get through inspection soon. Wolfgang Ziegler |
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