Need help with poor acceleration C240 4matic
06-06-2014, 01:30 PM
#1
Junior Member
Thread Starter
Need help with poor acceleration C240 4matic
My 2004 C240 4Matic has major problems accelerating from a stop. It does pick up relatively well (considering the anemic engine on it) when the weather is cold, but when is hot outside it is a matter of luck and patience to get it going (the hotter outside the slower the car). Once it goes above 30 miles the acceleration works a little better meaning that it only has a one second lag between the time you press the pedal and when it actually accelerates. I have no CEL on or any codes MAF and tranny fluid are new (same behavior trigger replacing the two).
Yes, I know it is a toy engine, but when I say slow acceleration it means the car starts as slow as one person would push it up to 10 mph then regardless if you press the gas 1/2 or floor it.
Any idea what could cause this odd behavior?
Thank you in advance for all your feedback!
P.S. Idling is a bit erratic but not too much more like when the gas is not a quality one I'll check today for vacuum leaks if in addition to any other ideas on where to look for the issue, you guys have any idea which vacuum hoses to focus on this engine that would be great
Yes, I know it is a toy engine, but when I say slow acceleration it means the car starts as slow as one person would push it up to 10 mph then regardless if you press the gas 1/2 or floor it.
Any idea what could cause this odd behavior?
Thank you in advance for all your feedback!
P.S. Idling is a bit erratic but not too much more like when the gas is not a quality one I'll check today for vacuum leaks if in addition to any other ideas on where to look for the issue, you guys have any idea which vacuum hoses to focus on this engine that would be great
Last edited by bdragomir; 06-06-2014 at 01:33 PM.
06-06-2014, 03:37 PM
#2
sounds like a transmission issue. Did you use the correct type/amount of ATF? Can you give more details on the servicing history of the transmission? did you check/replace the TCU plug that's known for leaking?
06-06-2014, 03:43 PM
#3
Junior Member
Thread Starter
I used the MB recommended fluid in the tranny the tranny fluid was serviced once at 60k then at 110k, I didn't replace the torque plug, but wouldn't a bad plug be bad in cold and hot weather as well? Same the tranny wouldn't be bad in any weather the car starts from a full stop and shifts within the normal parameters (I could say it is quite snappy) when the weather is between 0-75F and starts acting up at higher temps, the higher the crappier the lower the better it drives. In hot weather is shifting at probably 200rpm higher than in cold weather, but this happens only after it gets going which is the main issue. Thank you for the feedback, please keep it coming!
