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#1
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M104980 early revs cutoff
Hi everybody!
I got the 91 w124 300ce-24 (european), and have problems with early revs cutting off. At first my car had a automatical tranny , but i swapped 717450 mechannical getrag (dogleg ) one. With auto gearbox revs have been cut off at 7000 rpm (when i used kickdown) , but now it cutting off at 6000. For me it's a real problem nobody can solve. After reading a lot of forums i decided the reason is in MAS relay , because it cuts off fuel pumps. It would be great if somebody have a MAS box pin's diagram , or maybe somebody know what can i do with my problem? In advance Great Thanks to everybody and sorry for my awful english. Last edited by 300ce-24; 10-24-2012 at 12:59 PM. |
#2
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I wonder if you could just jump fused ignition power to the fuel pumps and bypass the relay? Only problem I can see is if there is emergency fuel cutoff (and unsure if there is anyways) that this would no longer work.
Otherwise, to answer your question, I don't know if I could come up with a socket assignment for a Euro car, do you tink a USA chart would work? You could probably jump pwer to the fuel pump outlet at the MAS connector.
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#3
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looking at a u.s car wiring diagram, i can't see an rpm input from any trans, auto or manual. rpm comes from the speed sensor from the flywheel, then td/rpm output goes to the mas relay. i would guess the manual flywheel MIGHT be at fault. the sensor reads the ring gear teeth. maybe the wrong rpm mas relay? seen it with earlier fuel pump relays. 4 cyl relays don't play well with 6 or 8 cyl motors. good luck, chuck.
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#4
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yeah ,now Iam thinkin about jumpin the MAS straight to fuel pumps, but MAS relay play enough big role , because it cuts off the fuel pumps when engine decays.
Last edited by 300ce-24; 10-24-2012 at 11:10 AM. |
#5
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At all i found 3 schemes , as a result i think pin 7 (kickdown cutoff) needs some work , on table i saw that when accelerator pedal on kickdown it takes 12VDC.
So , when i had automaticall tranny , car made 7000rpm on kickdown , and 5500 without. Following from this i think when a put 12VDC on 7 pin , my MAS relay will let the engine make 7000 ??? But really my opinion can be real silly What Guys do you think about it? MAS box costs from 99$ used and 400$ new , so Iam afraid to broke it. |
#6
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I think I would jump power to the fuel pumps (I think there is a connector under the rear seat bottom cushion which would make this easy to connect temporarily) and see what the result is. Again, for now I suggest trying this as a test to see if it solves the problem, then try for a proper repair.
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Click here to see the items I have up for auction at EBay Click here to see a photo album of my '62 Sprite Project Moneypit (Now Sold) |
#7
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DON'T put 12 V on pin 7. You WILL destroy the relay. It expects to see a solenoid hooked to pin 7 and not a voltage. Maybe it is checking for the resistance of the solenoid to increase the RPM.
Paul
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84 500 SEL (307,xxx miles) |
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