W126 420 SEC Coupe Running fault + ABS light?? HELP!!

[DR1VER]

HI

I've had my 420 sec for about 3 weeks now. Its been running fine and i've done about 1000 miles in it. I jumped in it outside work before and as soon as I started it the revs rose to 1900 rpm and the ABS light remained illuminated. I checked all the throttle linkages, all the fuses (including the one by the ecu) and tried turning it off and on a few times.

Any ideas guys?

 

[jaymanek]

does it do it all the time?

 

[DR1VER]

well it only happened a few hours ago and stays on constantly. When driving along the car will accelerate by its self until it reaches 1900 rpm.

 

[Dieselman]

Will the OVP do this.?

 

[jaymanek]

hmm ABS, could well be the OVP but OVP is usually intermittent, at least at first...

There is a little relay on the bulk head which has one or two 10A fuses, i would check to see if these have blown?

 

[talbir]

Very likely to be the OVP relay or the fuse inside it.

A surge may have blown the 10 amp fuse in the relay.

On your car (i.e. post 85) the OVP is by the wiper motor, inthe centre of the engine bulkhead, between battery and brake booster.

On pre 86 models, it is inside the fuse box.

Silver relay with plastic lid on top housing the fuse.

Sometimes fuse is blown, but relay itself can be bad,....try tapping to see if symptom is intermittent.

Naturally check that loom connection beneath the relay is tight and making good contact. This is one of the flaws of the post 85 w126 models - the relay sits outside the fusebox exposed to the elements and the contact pins corrode through water ingress, causing bad contacts.


talbir

 

[DR1VER]

I think it is the OVP. The fuse is ok, i'm going to take the relay apart tonight and re-solder it. Fingers crossed . . .

Thanks for the help guys

 

[DR1VER]

Re-soldering was partially sucessful. Bought a new relay from Europarts and all is now good. Thanks for the help guys!