Ok, thanks to your help, I think I may be making some progress!! I started the car from stone cold this morning, and this is the result:
1. First key turn, ran for 1-2 seconds, then stalled.
2. Second key turn, struggled for a second or two, then settled into its typical 1,400rpm idle.
3. Idled at 1,400rpm for 30-45 seconds, and then started running extremely rough, nearly stalling, at which time I lifted the sensor plate slightly, and the motor straightened out. Letting the sensor plate return to its original position caused the motor to run very rough and nearly stall again.
4. I could only find one vacuum hose connected to the WUR, originating from the small thermovalve. I disconnected the vacuum hose from the WUR, and the engines rough running was not affected at all.
Now, a couple of questions please:
1. Does this indicate a defective WUR?
2. During the struggling process, there is a heavy fuel odor coming from the exhaust, along with puffs of whitish smoke. It seems counter-intuitive to me that the motor would be running lean. You would think that a rich running motor would smell of fuel, so how does a lean running condition cause the heavy fuel odor?
Thanks very much for you thoughtful insight!!!
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