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#1
08-20-2009, 07:00 PM
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MAS SWITCH,W126,300SE
I am still inspecting my newly aquired 1990 300se,almandine red!,that I just got for next to nothing(940$,1 owner car) and found the MAS next to the brake fluid reservoir with a 0-1 switch on top...whats that gona trigger if I turn it,better ask first.
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#2
08-20-2009, 09:18 PM
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mas switch
HaHA turning that knob detaches the mas from its connector , go ahead it wont explode!TURN THEN LIFT , if its stuck be careful. lou
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#3
08-21-2009, 09:05 AM
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MAS is a relay module that turns on the fuel pump, air injection pump, a/c compressor, trans kickdown, & the O2 sensor heater. Also processes the RPM signal from the EZL.
__________________
MERCEDES Benz Master Guild Technician (6 TIMES) ASE Master Technician Mercedes Benz Star Technician (2 times) 44 years foreign automotive repair 27 Years M.B. Shop foreman (dealer) MB technical information Specialist (15 years) 190E 2.3 16V ITS SCCA race car (sold) 1986 190E 2.3 16V 2.5 (sold) Retired Moderator
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#4
12-22-2009, 10:32 AM
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hi guys
found this thread when searching for info on mas. whenever i start my car, the engine will rev very high (>3k rpm) for a few seconds before settling down to normal. this happens all the time, irrespective of cold/warm start. finally found the cause to be the mas unit. it's quite an expensive part! now that i got a faulty one, wondering where could i get this repaired? anyone? thx! yeo
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#5
12-22-2009, 01:02 PM
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Quote:
__________________
08 W251 R350 97 W210 E320 91 W124 300E 86 W126 560SEL 85 W126 380SE Silver 85 W126 380SE Cranberry 79 W123 250 78 W123 280E 75 W114 280
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#6
12-22-2009, 04:46 PM
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In case you need a m.a.s unit,give me the part number and i most likely have the part.make me an offer
Thanks Rich
__________________
88 300E White, sold 9-04  88 190E Black 2.3 sold 90 300CE White, Grey sold 12-24-04  92 400E White,Grey Sold 5-06  90 300CE 91K Signal Red,Black Sold 2007 1989 300CE Smoke silver,Tan Sold 1-08 1993 300E 3.2 M104 motor  1991 300CE White,Grey  1994 E420 beautiful car,gone to new home 1994 E320 Smoke an Parchment.Beautiful car 
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#7
12-22-2009, 06:33 PM
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how did i figure it was the mas?
swapped with a good unit from another 300ce. but of course, before that, almost everything have been checked by at least 2 workshops! mine is a 008 xxxxx and i replaced with a 011 xxx but i'm just wondering if i could just repair my faulty unit and keep it as spare in case this problem crops up again. yeo
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#8
12-22-2009, 06:50 PM
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It sounds like you got a good deal. When I got mine I changed all the fluids. If you have the service records check to see if the head gasket was done if not keep a close eye on your coolant reservoir for oil contamination. If you see any oil in the coolant you will need a head gasket. These are excellent cars; in the short time I have owned mine (since September) I only have had to replace the voltage reg., one lower ball joint, and the brakes. It needs a head gasket but still runs very good. I paid 200.00 for mine; it just goes to prove "you don't have to pay a lot to get a lot."
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