W202, C240 auto shifting problem?

[MotardMan]

Hi all,

My C240 seems to hold on to the revs far too long for my liking under hard acceleration. When it does change up, the car then surges forward with renewed vigour, but overtaking in this car is a lottery. Even if you floor the loud pedal (kick down engaged), the car winds up through the gears and as the engine nears the redline, rather than change, it holds onto the revs. The top end is as flat as witches t1t too. I put it down to the motor being a bit gutless compared to my 300 W124, and the 300-24v W124 and the E320, but surely a more modern motor in a lighter body should be as perky as the older 300 straight six, even if it is not as torquey?

Drive the car at a more leisurely pace and it shifts perfectly, very smooth, subtle shifts and on time.

I'm confused. I'm not expecting a performance car, but I am expecting "on time" shifts in the upper rev range when kicked down. It has got to the stage where I let it rev round to near red line, and then back off the throttle to make it change up, not ideal on an "automatic" box.

Suggestions?

 

[BlackC55]

Check the ATF level.

Have you considered an air mass problem?

 

[MotardMan]

I'm sure the ATF level is good, but will make certain, thanks.

Have removed the MAF sensor and examined it and it is spotless. I was disappointed to find it that way as I was sure it was the root of the issue. However, the car drives faultlessly unless you have your foot hard down.

 

[television]

I think that you must change the gearbox fluid before anything else

 

[BlackC55]

The air mass will nearly always look ok. It is impossible to tell visually.

 

[jibcl500]

I was going to suggest MAF but ive suggested MAF recently quite alot so I thought I'd keep it shut.

Unplug the MAF with the engine running, if the engine stalls the MAF is duff, if it runs lumpyish then its ok.

jib

 

[television]

I was going to suggest MAF but ive suggested MAF recently quite alot so I thought I'd keep it shut.

Unplug the MAF with the engine running, if the engine stalls the MAF is duff, if it runs lumpyish then its ok.

jib

I feel the same as you on this one, its does give the impression that one has a MAF on the brain

 

[jibcl500]

Mal

Ive had too many mercedes recently coming in with failed MAF's, well that is until a CL came in with failed coil packs.


jib