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The car runs for five seconds then stalls

1248 Views 30 Replies 5 Participants Last post by  MBGraham
I have a 1974 Mercedes 450 SL that runs for exactly 2 to 5 seconds and then stalls consistently… Any thoughts?
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I believe car would act as you describe if it was running for a few seconds off of cold start valve/injector then stall because fuel injectors aren't firing. You mentioned checking vacuum at MPS. The 4-prong fuel injection harness plug on MPS must be plugged into MPS for car to run; otherwise, car will fire up for a few seconds on cold start valve then die because ecu won't send signal to injectors with MPS unplugged. Perhaps you knocked MPS plug loose when messing with vacuum hose?
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