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This past week suddenly I have this problem:
As normal, I turn the ignition on without pressing on the accelerator. Starts but then immediately dies. Only when I restart then hold down the accelerator at a somewhat high rpm for at least 2-4 minutes, then the car will idle fine.
Subsequent starting works fine, until the car sits for several hours. Then same problem. BTW- it's pretty warm here in central PA this week :-)
I've had an intermittent problem with the car stalling (in the past) while sitting at a traffic light. I haven't driven the car at all this week for fear it will die on me in traffic.
Because I happened to have a new gas filter on hand, I decided to install it yesterday. Hasn't seemed to have had any impact on the problem.
As per Bentley, I measured the voltage at battery terminals (while running) = 14.64 volts. Voltage at the main fuel pump terminals is 13.46.
I then measured the output of gas from the fuel pressure regulator (return), using the procedure in Bentley for running the pumps without starting the engine (page 230-2). I got 20 ounces (600ml) in exactly 30 seconds.
I can hear and confirm that both main fuel pump and transfer pump are working (With my poor hearing I need to take the gas cap off and stick my ear right on it to hear the transfer pump).
Two months ago I did a bunch of maintenance on the breather side of things- new flametrap, new oil separator, cleaned TB, new breather hose, new intake mainfold gasket, etc.
No unusual noises or smells. The only other thing I can think of that might be relevant- when replacing the old fuel filter I got some pretty dirty gas flowing out it. However, the gas I got from the return (off the fuel pressure regulator) was clean (this was after fuel filter replacement).
I don't own a tach or pressure gauges/related.
Don't know what to try next. If I need to inspect the transfer pump, what parts should I have on hand prior? What to use as a replacement gasket/adhesive under the access plate? I've been looking at the FAQ, but unsure how appropriate those details are to my 1991 240- seems much more complicated than Bentley suggests.
Could this be a fuel pressure regulator or the fuel pump check valve?
Thanks,
Keith Ostertag
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1991 240 Sedan B230F LH3.1 M47 300K miles
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