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I bought a 92 745 non-turbo, 220K about a month ago. Regina system. I've driven it a couple thousand miles already, and the car runs great, gets around 23 mpg.
It failed emissions, though, and the O2 sensor looks ancient, so I thought I'd give it a new one. I installed the new sensor tonight, not a universal, but the real thing, made by Walker. While I was at it, I removed and cleaned the oil breather box, and installed a new flame trap kit.
Now the car runs like a DOG. It has zero power unless the pedal is ALL the way on the floor. In retrospect, I wish I hadn't messed with anything but the O2 sensor, because now I don't know whether:
1. Something is bad in the FI system and the (presumably) bad old O2 sensor actually helped.
or
2. I broke something/knocked something loose when I did the whole oil breather box thing.
a. I had to remove the idle air valve, as well as the main air intake hose to get to the breather box. I'm PRETTY SURE I put it all back the way I found it.
b. The vacuum line for the flame trap was routed to a tiny little nipple, while another vacuum line, which runs over to what looks like a sensor on the the fender well near the diagnostics port, was connected to a larger nipple. I thought the flame trap needs the larger nipple, so I switched them. Do I have that backwards?
Sorry for the long post. I know I can step through the engine performance section of the FAQ. But I hoped someone may recognize something in my story and be able to shed some light on the situation.
Any ideas or input are welcome.
Thanks in advance,
Bob
'92 745
'99 S70
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New O2 sensor and flame trap = LOST ALL POWER! [700]
New O2 sensor and flame trap = LOST ALL POWER! [700]