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#1
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1987 Mercedes 560SL Fuse 7 keeps blowing causing no/low acceleration
New informaiton: Happened again tonight and the best way to describe it is that the brakes completely lock up and then if I sit and wait long enough with the car off, it seems to clear itself.
Hello- I have a new (used) 1987 Mercedes 560SL Automatic, with 78k miles on her. The other day, I was driving down the street and she started slowing down and it became harder to accelerate altogether. I pulled over and turned the car off. After a few minutes, I started her up and put her into drive - she wouldn't move. It was as if the brakes were on. I waited about 5 more minutes and tried driving in 3rd and 2nd gears and she finally picked up again as if nothing had happened. The guy I bought her from said that he knew the fuse blew when the fan was turned on, but I bought it anyway for a price reduction. I didn't even look to see if the fuse was blown. After the incident above, I looked and fuse 7 was shot. It continued to drive well after that until today when I finally replaced the fuse. It drove normally for about 5 minutes and then I noticed the power coming down again just like before. By the time I got to a place where I could pull over, it would barely go. Turned the engine off and waited like last time. I noticed the fuse I had just put in was blown. This time it took several tries to get her back to moving easier. A few starts and stops, with trying it in different gears got her going a little better each time until she finally felt like something freed up and she was fine again. One thing I did notice during all of this, at some point, is that my break pad sensor light came on for a few minutes, but I don't know if that's related or not. Anyone have any ideas about what this could be? I know fuse 7 controls a lot of things, most of which an amateur like me sounds like it could be the cause, which gets me nowhere. Help for a newbie, guys? Last edited by britain817; 05-12-2010 at 02:36 AM. Reason: New information |
#2
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Fuse # 7 has nothing to do with your problem!
Sounds like a mechanical brake problem. Most likely a master clyinder OR booster issue. The most common reason fuse #7 blows are the heaters on the washer nozzles. Just un-plug them.
__________________
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 |
#3
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Nice! Thanks! Now, how to troubleshoot brake issue?
Thanks for the information. Tomorrow I will disengage the washer heaters and see if that helps fuse #7 stop blowing.
Back to the brake issue, though... how do I begin testing for the issue? If the brake issue is most likely due to the master cylinder or booster, where do I start? Thanks very much, by the way. |
#4
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Fuse #7 still blows after disconnecting washer fluid heaters. Any other culprits?
]Fuse # 7 has nothing to do with your problem!
Sounds like a mechanical brake problem. Most likely a master clyinder OR booster issue. The most common reason fuse #7 blows are the heaters on the washer nozzles. Just un-plug them.[/QUOTE] |
#5
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Master Cylinder or Booster Problem
How should I troubleshoot whether or not this is a master cylinder or booster issue?
Fuse # 7 has nothing to do with your problem! Sounds like a mechanical brake problem. Most likely a master clyinder OR booster issue. The most common reason fuse #7 blows are the heaters on the washer nozzles. Just un-plug them.[/QUOTE] |
#6
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You were right about the brakes
You were right. I needed a new booster - breaks are great now.
Fuse #7 does keep blowing, though. I took it to a place that only does wires, and they haven't been able to find it yet. I unplugged the heaters on the washer nozzles before I took it and that didn't solve the problem either. One thing that did happen was that the guys at this place took out the master relay fuse and the fuse #7 related issues seemed to go away as far as I could tell. The fan and air seemed to be working - Does that mean the problem is not related to the blower? Thanks for your advise! |
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