Hello once again!
Thanks for the response to the fuel pump relay, now onto bigger and better things~my 240 went from getting 27mpg, to 14mpg in the last week and is spewing carbon from the exhaust. I am afraid to drive it as it is, although it starts right up...a bit rough running though and hesistation when I start. About 2 weeks ago I started hearing a very high pitched whistle from the front which is sporadic so I am unable to pinpoint the cause.
Thanking you in advance! I am so appreciative of this forum!

 

so preoccupied with my car I forgot to mention:
Happy New Year to all!

 

The whistle is very likely a vacuum leak, possibly a vacuum hose, intake hose or intake manifold gasket. This will also cause a fuel mixture problem.
An easy way to find a leak is to put a piece of hose up tightly to your ear, and move the hose around close to various gaskets, hoses etc when engine is running. You will hear a vacuum leak. Another way is to squirt WD40 at any suspect joints in gaskets, hose joins etc. The oil momentarily seals the gap and smooths out running.
As to why it just happened, I don't know. Sometimes things like this occur and you spend ages looking at what you've just replaced thinking it is the problem when it is not.

Regards, Andrew.

 

Make sure there isn't any gas in the vacuum line that goes from the throttle body to the fuel pressure regulator, and that the line isn't split.

Check for holes in the large platsic hose that goes from the air mass meter to the throttle body especially where wires have rubbed against it since that will allow un-metered in air in.

What year is the car?

 

It's a 9O. Yesterday I removed the amm, the air filter (clean as a whistle), and all hose up to the throttle body, which I cleaned. All appear to be fine...
today I will go out there with a hose and my ear :-)
thanks!!