Please help.kickdown hell.

[Tim Woollands]

I am in dire need of someone who has cured my cars problem. I have a 2002 s203 c200 1.8 kompressor auto. other than a fault on the lambda which I am currently in the process of curing as I just fitted a new one. after I accelerate hard or kickdown the car will be sluggish as if in limp mode until I turn it off and on again. I have replaced the maf and that checks perfectly, I have flushed and replaced the gear oil and filter with proper Mercedes oil to the correct levels. I have done and oil and filter and new plugs and a new air filter. everything seems fine and yet this still keeps happening, its terrifying if you try to overtake. please can anyone help me.

 

[gbjeppm]

First question, you say you replaced the MAF.

These in my experience are quite MAF sensitive, was it either a Bosch or MB part? If not, and you got it from ebay, I would start there again.

 

[Tim Woollands]

it was a reputable Maf from an mb specialist and seems to be working fine according to the diagnostics. I have tried two maf sensors and its the same for both. But I will try another one Matt if I cant find anything else. I was wondering if the kickdown has a relay?

 

[dozypillock]

it was a reputable Maf from an mb specialist and seems to be working fine according to the diagnostics. I have tried two maf sensors and its the same for both. But I will try another one Matt if I cant find anything else. I was wondering if the kickdown has a relay?

Different car to mine, but mine displays similar sometimes. Code reads as "unusual accelerator movement" or something similar. Have been advised that as there is no cable, but a Potentiometer running the throttle (bit like an old volume control that goes scratchy) it will be worth changing soon, as it will fail completely at some point, so no throttle at all.
On mine, I assumed previous owner may never have pushed pedal that hard, so sat for 5 minutes with ignition off, and pumped pedal to floor and back repeatedly to clean the track. Have not had problem since, but still in back of my mind that it may fail, so will get replacement just in case.
Like I say, different model, and maybe yours has cable? If not, may be worth a try.
Mine had a "lull" in that throttle would work again, but only if pressed for couple of seconds, then fine. Reset cured it instantly, and back to normal etc

Neil

 

[Tim Woollands]

that sounds a great idea Neil. thanks I will give that a try. mine belonged to an elderly gent prior to me so it would make sence.

 

[dozypillock]

that sounds a great idea Neil. thanks I will give that a try. mine belonged to an elderly gent prior to me so it would make sence.

Mine had a more recent 4K a year mileage so suspect nobody had ever booted it hard time. (still less than 90K even now, but then I have done only about 5k in last year in this car). Never had a problem until I got brave enough to try it.
Happy with results when it works though, and good enough for me.

Neil

 

[MancMike]

I have the same question about the lambda. Don't buy cheap ones. I replaced one on a car with a £35 one and it never worked right, the car just ran like a pig. (it was manual, nothing complicated). I was told instantly cheap lambda, and I replaced it with a proper part costing £120 and it instantly fixed it.

Not suggesting that's your issue as I've no idea, but if you bought a cheap lambda, i would think it likely.

 

[Tim Woollands]

I bought the better bosch lambda and fitted it, but I think I have a bad connection showing up intermittently.