I recently purchased a Renntech intake for my clk430 and had it on the car for about 2 days. Then someone suggested disconnecting the battery for 10 minutes and reconnecting it to reset the ECU to unleash its full potential. Well I did it and now the car is EXTREMELY sluggish, especially at full throttle. Does anyone know what went wrong or what I can do to fix the problem? Thanks in advance.

Resetting adaptations can be a benefit or it can be a bust.

If your car has been running with a positive fuel correction and you readapt you will at first remove the extra needed fuel. If this is noticable you probably are real close to needing an air mass meter. Whatever the aftermarket piece is that you installed it will have much less impact on performance than a proper working AMM.

The other possibility is that you have altered the throttle position adaptation and you are now not getting full throttle response.

Both adaptations will probably relearn shortly. The fule adaptation will be relearned in 20 miles unless you just happen to drive it wrong. It will happen soon in any case.

I'm not sure about the throttle. I would try this: turn the ignition on and let the car sit without the engine running for a minute (it only takes 30 secs with a tool but give it time), then shut off the key and wait atleast 10 seconds and try it.

Disconnecting the battery also looses many other adaptations, windows, sunroof, D2B ring, steering angle sensor, clock, and others. Have you straightened out those problems?

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician

Thanks for the quick response. I have driven the car about 40 miles and the car still has problems (what did u mean by if I happen to drive it wrong?). I tried the ignition thing you were talking about and there was no change. And in terms of the other problems, I fixed the window problem but don't know how to go about the rest of them. I should've never listened to the guy, the car was running great. Do you think this could be a tune up problem cuz the car has about 60k and I'm replacing the ignition setup soon to an evosport stage I ignition. Thanks for all your help, I really appreciate it.

Wrong, yea I guess that does need an explanation, except I don't even know right. On earlier, stupid systems like LH and HFM right was straight forward.

It took a load of 40 to 80 kg/hr held at a rpm of 1600 to 2200 rpms for around tens seconds to due an adaptation. The only way these systems could be relearned quickly was on a dyno where these conditions could be held. That load will accelerate a vehicle out of the rpm range on flat ground in about a second or two. The only way to stay in the range for ten seconds or whatever the time, was to find the right size hill. Those cars had to just be let out with instructions to bring them back in a couple weeks or more.

The ME system is so quick I have no idea what the criteria is. I know if you could drive 20 miles at less than 2000rpms you would not adapt. Maybe at altitude you might not adapt. If you don't drive in some relatively steady states you won't adapt. Its pretty hard to do it wrong but I can't exactly say what is right. I just calmly drive the car about 5 miles and it will usually get over 50% of the total long term adaptation done. By 20 miles you would have to know how not to adapt to keep it from adapting.

I'm not sure if the throttle ever will adapt on its own and as I was thinking about criteria I remembered one thing else. I have been trying to think of what you might could do with an aftermarket device to improve on MBs system (I do NO performance work on MBs Donnie would be the one to talk to about such). The ignition system is so smart and so overengineered that the only improvement I could think of would be programming. That is when I realized that if at any time some tech had decided to give you all there could be, he could have entered the correction program and altered the timing for high test gas! That correction would be erased by a computer reset.

I would guess that you probably should see someone capable of reading and making such a correction and have him readapt and relearn the system with the timing correction. If your car is up over 1.20 in its multiplicative adaptation numbers a new air mass meter is going to do more for you than anything short of a supercharger and you would really need one then.

That motor needs its first spark plug change usually to prevent the plugs from sticking in the heads. I have never seen a 112/113 with a bad spark plug, even at over 90k.. I have seen wire problems though. The test for wires is also done by the same guy. He will run the system on either the "A" coil bank or the "B" coil bank. Since the motor runs fine with only one coil, doing such should make no difference. If though you have a dead or arcing wire or coil pack the car will miss when the good coil bank is shut down.

__________________
Steve Brotherton
Continental Imports
Gainesville FL
Bosch Master, ASE Master, L1
33 years MB technician