[W126 Coupe] Strange Fault (& fix)

[Vance Rowley]

Ronny,
 
  I also have an after market alarm and immobilizer fitted. A few times in the past, I have had exactly the same symptoms as you describe (as far as the starting is concerned). To correct it, I needed to disconnect the battery for a few minutes, then reconnect again. This has reset the immobilizer/alarm system enabling the car to start first turn of the key.
Maybe when you pressed the button to silence the alarm, maybe it managed to reset the system and therefore having the same effect.
 
Regards,
 
Vance.
 


From: ronny.geenen at verizon.net
To: mbcoupes at mbcoupes.com
Date: Sat, 11 Jun 2011 21:15:25 -0700
Subject: Re: [W126 Coupe] Strange Fault (& fix)





You guys are good in solving problems. Two weeks ago I was doing a Real Estate job. I parked the car and get out taking the key with me.
About 10 minutes later I got in my 87 560 SEC and want to start the engine. But no nothing happened, nada. Totally dead. I took the key and open the drivers door to get out.
The car has an after market Clifford alarm system that started making noise. I pushed the button and the alarm went off. I did not know why this happened and decided to try to start again. The car started at the turn of the key and has done it every day. No repeat problem. Why?
 
Ronny


 

From: Jay Febish 
Sent: Saturday, June 11, 2011 8:30 PM
To: Mercedes Coupes Mailing Lists 
Subject: Re: [W126 Coupe] Strange Fault (& fix)
 
When the wiper/brake problem happened did you happen to notice if the ABS light came on? My '91 did the same thing once. I replaced the OVP relay and never had the problem again. These cars are very quirky when there is the least bit of voltage problems, either over or under the optimum. (12.5v at the battery with car not running, 13.3 to 13.5v at the battery with the engine running.) 

 

On Jun 11, 2011, at 10:56 PM, Attila wrote:


                There is no co-relation between the two.  Check the vacuum line from the
brake-booster to the intake manifold (lower plenum).  Great big plastic
thingy.  If that is good, put vacuum gauge on main vacuum line and see if
it holds.  Yours very drunk in Florida.  If the car was here, I could find it in
no time flat. Sayonara.
 


From: mbcoupes-bounces at mbcoupes.com [mailto:mbcoupes-bounces at mbcoupes.com] On Behalf Of Vance Rowley
Sent: Saturday, June 11, 2011 10:33 PM
To: mbcoupes at mbcoupes.com
Subject: [W126 Coupe] Strange Fault (& fix)
 
Over the years, I have had (and heard of) some strange faults on these wonderful cars. But I can't work this one out.
Here is what happened.
I was driving into town one night (about 8 miles from home) when it started to rain. As you would expect, I turned on the wipers. They worked for about 30 seconds, then "poof" they stopped just as I was coming up to a red light. I hit the brake pedal, and it just sank to the floor. Luckily, I had already slowed down considerably before braking, so with a few pumps on the pedal I managed to stop OK.
To cut a long story short. Driving very carefully and quite a bit of pumping of the brakes, I managed to get to my destination and was also lucky the rain stopped for my return journey home.
Next day, I checked the fuses, and as expected, the fuse that powers the wipers had gone. I replaced it with a new one, and hey presto, they worked perfectly. (Nothing strange there I hear you say). I then thought, now to get to the brake problem. So jumped in the car and set off to my local garage I use for service and repairs (when I can't be bothered to do it myself). As I came up to the first junction at the end of my road, I hit the brake pedal and nearly went through the windscreen. I then did a few tests up and down my own street and managed to stop on a dime every time. The brakes worked perfectly with no sign of the pedal sinking to the floor. So I cancelled my visit to my local garage and nearly 3 months later everything is still perfect.
Now I can understand the fuse for the wipers going on a 1991 car, especially as I don't use it that much these days, but can anyone explain to me how the hell can replacing the fuse for the wipers fix my brake problem as well at the same time. I just can't work this one out.
If anyone has any ideas or recommendations, I would love to hear from you.
Yours very confused,
Vance
1991 560 SEC Euro.The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.

 


The MB Coupes Website!
W126 SEC Mailing List
Postings remain property of MB Coupes, L.L.C.

The MB Coupes Website! W126 SEC Mailing List Postings remain property of MB Coupes, L.L.C. 		 	   		  
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