Changed battery, super bad idle now won't stay running, Can't drive it - PeachParts Mercedes-Benz Forum

batterykilledit · #1 01-10-2007, 11:39 AM

OMG please help. I was having problems the other day with my battery. I had to jump it a few times and then got it home and bought a new battery. Everything at this point ran fine except the battery. I changed out the battery. Now My car won't even run. It starts up.. revs high for about 20 sec then drop out and stalls. I try to press on the gas and there is no/late response and the rpms are all over the place. I'm driving 99 SLK230 with 56,000 miles. I have tried resetting the ECU by disconnection the battery but have no luck.. What could this be? What can I do? Any ideas?

Ethan · #2 01-10-2007, 03:09 PM

1) what kind of replacement battery did you get? specs? could it be faulty?

2) have you checked the POSITIVE terminal on your car to make sure all the wires are secure? The fact that you jumped the car a few times then replaced the battery - maybe a wire or connection was pulled apart - pay particular attention to the positive cable.

3) I don't even know where the battery is in an SLK, trunk or engine compartment? But before you freak - make sure no connections were knocked off while doing the battery change.

4) just a guess and do a search on this - but isn't there a resetting or warm start resetting if you start the car with the gas peddle pressed all the way to the floor?

#3 01-10-2007, 04:25 PM

You might need to reset the adaptation values, noting the age of the car.
If the fuel trim and maf was way out, losing battery power can cause this. The car needs to re-learn it's parameters.

batterykilledit · #4 01-10-2007, 04:39 PM

Quote:

Originally Posted by John Holmes III

You might need to reset the adaptation values, noting the age of the car.
If the fuel trim and maf was way out, losing battery power can cause this. The car needs to re-learn it's parameters.

I am looking into this now. sounds like it might be it.. Do I need have a dealer do this or is this something I can do myself? what I'm finding so far requires a tool from snap on or the likes.. any more info would be a huge help.. thanks in advance!

#5 01-10-2007, 05:28 PM

Try this:http://www.continentalimports.com/ser_ic60442.html

The author is a moderator here, and is a factory trained shop owner.

#6 01-10-2007, 05:32 PM

It's probably best to let someone who knows, use a scanner and relearn the car. The scanner costs a fortune, and it takes a bit of know how to do it right. IMHO.

batterykilledit · #7 01-10-2007, 04:37 PM

Quote:

Originally Posted by Ethan

1) what kind of replacement battery did you get? specs? could it be faulty?

2) have you checked the POSITIVE terminal on your car to make sure all the wires are secure? The fact that you jumped the car a few times then replaced the battery - maybe a wire or connection was pulled apart - pay particular attention to the positive cable.

3) I don't even know where the battery is in an SLK, trunk or engine compartment? But before you freak - make sure no connections were knocked off while doing the battery change.

4) just a guess and do a search on this - but isn't there a resetting or warm start resetting if you start the car with the gas peddle pressed all the way to the floor?

1. same battery specs brand new from costco. (car does start up without any problems) just won't stay running

2. yes check a million times so far :-(

3. engine compartment.

4. I tried to do that. Not sure If i did it right.. if anyone has more info on this that would be great.