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OH MAN, I'd love to run up there, what a great area to be in. Until your Mercedes conks out on you, anyways ;-)
I would also be interested in what TOPGUN mentioned. the indication being that maybe it jumped time on you, mostly. But a 560 is a pretty tough engine and if those miles are true, would seem unlikely.
The shotgun approach to diagnosing has to stop, though, yeesh TWO fpr's? All you need to confirm a bad fpr is jump the input and output. And as far as the ovp, the car wil actually RUN without it, just not very well, not like it should. With a warm engine you'd hardly notice it.
Few questions:
If you put it all back together, will it run at this time?
How many miles have you driven it since you got it.
Are you SURE there is gas in it, and if so how long ago did you refuel it? (you could get gas out of it now as a test but low enough to stall if going up or down hill or when cornering is why I ask and YES the fuel gauge could be inoperative, I have seen this before!).
On a no-start, the BASICS need to be looked at first, not pointing fingers at things that are unknown, things like relays and OVPs. Remember it needs FUEL, SPARK and COMPRESSION. The spark has to happen at the correct time of course, usually if it is NOT in time to a great enough degree, you will get a backfire, either out the intake or the exhaust.
Remember this is NOT sequential injection, those injectors spray continuously, not in an order, although it very much looks like it would. One way to check for a failure in the injection system is to spray a bit of something combustible into the intake and seeing if the engine trys to run on it, something like a small shot of ether or even some carb cleaner.
Get bac on some of this, you have found a good source of information with this site.
Gilly
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