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W210 Wont rev over 1k

8972 Views 20 Replies 6 Participants Last post by  icy75
I went to start my car yesterday and all I got was a single click, I presumed it was a dead battery (battery is about 3 months old) car is not used much, when I took the battery off the earth terminal was wet and rusty, in fact the nut has rotted away the terminal pulls on and off the pole with slight force, I dried the pole charged the battery overnight, I put the battery on this morning and I still just get a click, I know the battery is fully charged and is healthy, if the battery was faulty my charger would tell me.

Where is the moisture coming from on the negative terminal nothing else is wet?

I have replaced the earth strap, the old one was a mess, there is nothing else under the seat that was damp just the earth terminal.

The car now starts perfectly fine with the first turn of the key since changing the earth strap, however a new problem has manifested in that I have absolutely no power whether it be forward reverse 1 or 2, on tick-over it isn't steady and rapidly rises and falls, if I put my foot on the accelerator I get a miniscule response, I do have a 38 pin fault code reader which didn't pick up anything.
When I last moved the car about a week ago it was running very smooth it seems strange that suddenly after the battery incident the car has thrown its teddy out of the pram and stubbornly refuses to move.

I have had BAS/ESP & SRS lights on for a while which I was going to get reset this week or see if there's any problems if it wont reset, but today since putting the battery back on I suddenly have anti skid warning flash up on dash as well as the ABS warning on screen (the car wasn't moving )

The car wont accelerate past 1k revs which made it interesting as I had already rolled off the drive ok in reverse before discovering this fault and was then stuck across the middle of the road and the car could literally move a few milimetres on its own steam.

I have had lots of cars before in fact this is my 40th car and have never seen any with problems such as with this car, I will never buy another Mercedes again once I finally manage to get rid of this one.
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start the car up, keep it in Park. turn the steering wheel to the left all the way and hold for a second, then turn to the right all the way and hold for a second. your warning light on the dash will go off and it wont be in limp mode anymore.

to clean up your terminals, carefully apply a can of coca cola or a paste of baking soda and water. let it sit on there for a few minutes and rinse it off... once it dries. apply some anti corrosion grease to the exposed metal contacts.

I use this stuff all the time. It rocks! Sanchem NOOXID electrical grease & electrically conductive grease dielectric grease and contact lubricants
As you can see, it was in pretty sorry state, it certainly wasn't worth saving and putting new end connector on, I just replaced the entire strap, when I pulled the rear seat up and looked at it I was shocked to see it in such a bad condition.

I have tried lock to lock, but it didn't work, I wondered about disconnecting the battery overnight and trying again in the morning?

GNARLY dude! There should be a tube coming off of your battery like the stuff on a fish tank. It leads to a hole in the floor board and vents any gas out of that compartment. That should not happen inside the car! MB calls for a special type of battery that can be held upside down for 15 seconds or minutes.. I forget. They also have a nipple in the middle for the vent tube to be attached to.

Did yours have this vent tube on? There are a lot of electronics smashed into that box, you can't have vapors or moisture in there at all. Check the floor too and make sure it's sealed up.

Battery with tube attached, waiting to be installed. Tube slides into rubber grommet that goes to the outside of the car.
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