My sister's car died on her and after finding no compression in one cylinder, I am trying to decide what to do with it. I will part it out if there is a market for it. If there is not, I'm just gonna get a couple hundred bucks from a junk yard for it. So basically, if there is any part that you guys...

I finally got around to checking compression and the one cylinder has zero compression. Guess I'll just part it out or something.

Also, according to my research, a faulty RPM sensor should kill the spark. I have spark, so now I'm thoroughly confused.

Thanks. According to other websites, 312 should only come up in mode 1, which I was not it, however, I'm gonna try it. Do you know if (like the MAF) I can unplug it and temporarily bypassing the problem?

I can't figure out what's wrong with my sister's 850 non turbo. The code showing is 312 in mode 2. I can't find that code on the internet nor can my mechanic friend find it. Not in mode 2. Before this volvo quit totally, it was running rough but still going. A month later it quit completely. It will...