Washed engine, now car won't start
 

I washed my engine last night, I did use the hose but did not get too much water on there.

Car sat over night until this afternoon, I go to start it and nothing. Car doesnt turn over, or even make any noise for that matter.
Alternator is new.
The lights work and the key works to unlock the doors and stuff so I am assuming it is not the battery or the key.

Any one know what it could be? Could I have gotten water somewhere it shouldn't be somehow?

I'll be back tomorrow afternoon to try to start it again..

thats horrible

Never assume
 

it is not the battery mb's are high draw starters and even lights or doors are no indication of charge. When it drops below a set voltage it just won't turn over at all.
Charge the battery key out via the underhood charging post and a good clean negative connection to the chassis.
Then try to start.
If it starts you will most likely have abs esp warning lights but just turn the steering wheel all the way lock to lock and back a few times to reset the steering angle sensor.

:eek:

I never hose down my engines, I hope everything works tommorow.

my brother called me and said the alarm is now going off, I'm not going to be home for another 6 hours so I'm sure the battery will be dead by the time I get home since I have both sets of keys

Wet coil pack, grounding it out maybe ...

pull intake off, yank the plug wires and make sure all dry ... sounds like an ignition issue

You always start the engine right after you wash it to dry out the water. Trying using the air hose to blow out all water and moistures left over night.

Wet coil pack
 

or water in the plug recesses is not going to prevent a M112 from turning over not at all. Don't waste time pulling the intake and packs and drying plugs. They are not the issue. Charge the battery. Start there.

If the alarm is going off, it means the battery's dead

the grounds for the oem harness are in the valley of the engine where the intercooler is, so if theres a lot of water build up there, the car might not be turning on to prevent a short to the ecu. But try the battery but try to check for excess water in the valley. Its really easy for water to be trap there and there no real way of draining the water there short of letting the engine burn it off.

Thank you guys for all the help!! Much appreciated!

So I got home and the siren was going off, since the battery had died and the alarm stopped working. I charged the battery and jump started my car, and it worked. So far it's been good

So maybe the water wasn't the issue? I did start the car after I washed the engine, but then it sat after that....

Not sure how to battery could have died, I didn't leave anything on :nix: or why the alarm randomly went off

** Next time, don't wash your engine, I've heard this happening many a time **

Yeah, I've never had an issue with it before, but now I'm going to stick to wiping it down with a damp microfiber that's for sure!!

Make sure you charge your battery with a battery charger and not your alternator.
Trust me, if you overtax your alternator, it will die soon too.

i charged it by jumping it and letting it run. By letting it run is that charging it by using the alternator? My alternator is pretty new

the point is that alternators were never made to charge a deeply discharged
battery, but only to provide supplemental charging. one should determine
the degree of battery discharge before selecting the method needed to
recharge. if the battery is below ....mmm....12 vdc, you really should go
with a trickle or 10 amp charger.

NEVER JUMP YOUR CAR! it will blow your rear SAM. in the future, use a trickle charger

Urban myth. I've had MB roadside jump mine before and they confirmed that this is a myth. The C32 can be jumped with a proper jump system.

I jumped mine with regular jumper cables, it's been working fine ever since. Next time a trickle charger will be a better choice, but let's hope there is no next time

I did the exact same thing and now have intermittent battery failures. Any luck finding a proper diagnosis?

If you've ruled out the issues discussed above in this thread (and you know your battery is good), then it's time to think about battery-draining problems in this car: the first thing I'd look at is the seat control modules which are quite commonly defective.