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#1
01-26-2007, 03:20 PM
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What To Do Next
 MY 1991 190E 2.6 HAS GOT ME AT A LOSS. A COUPLE OF WEEKS AGO IT STOPS RUNNING. AFTER GETTING SOME ADVICE FROM ANOTHER FORUM MEMBER AND RUNNING A FEW SIMPLE TESTS WE FIGURE OUT THAT MY MAS CONTROL UNIT IS BAD(FUEL PUMP RELAY). I PURCHASE A UNIT AND INSTALL IT AND... STILL WILL NOT START. COULD ANYONE SHED A LITTLE LIGHT AS TO THE NEXT STEP I SHOULD TAKE? ALSO IS THERE ANY WAY TO TEST THE NEW UNIT(MAS CONTROL UNIT) TO SEE IF IT IS BAD? THANKS IN ADVANCE.
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#2
01-27-2007, 01:26 PM
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You mentioned MAS and the fuel pump relay in parentheses...unless I'm absolutely incorrect or you have a pretty exotic MAS unit, the fuel pump relay is a separate component having nothing to do with the MAS.
The MAS may affect performance and possibly set off a CE light, but wouldn't contribute to the no-start issue.
__________________
2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car
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#3
01-28-2007, 07:30 AM
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The Mas Control Unit (89-93models) Incorperates The Fuel Pump Relay Or So I Have Been Told. I Think My Fuel Pump Is Ok . I Can Here The Pump Ingage When I Turn The Key On. But That May Just Be It Priming The System And Then The Mas Control Unit Takes Over , I Don"t Know. I Have Not Been Able To Crank The Car Up In A Month Or So With The Exception Of Three Timmes. Twice When I Was Trying To Figure Out What Might Be Wrong And It Just Turned Over And Once When I Jumped The Fuel Pump Relay With A Piece Of Wire Between The Fuel Pump Relay Plugs. All Three Times It Went Back To Not Starting Again.
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