Question about 1995 Mercedes-Benz C-Class

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Accelerates slowly and transmission shifts hard

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  • solid_heart0 Jul 30, 2009

    check engine light is on...the car idles really rough...specially when ac is on...you push the gas all the way and it will respond really slow. The tranny shifts really hard specially on first and second gear. the speedometer is way off as well...it doesnt go up... thank you for any input

  • Ryan Jasper
    Ryan Jasper May 11, 2010

    is the check engine light on. It sounds like a possible catalyst problem? Need more info.-

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  • Mercedes-Benz Expert
  • 489 Answers

Most probably you need to check the valve body

Posted on Aug 15, 2009

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1992 chevy 3500 wont shift unless under hard acceleration


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I have a 1998 ford contour 2.0 liter automatic transmission vehicle with 150,000 miles. It just recently began having trouble accelerating and shifting. If you hit the gas it slowly accelerates and...


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Transmission is fixed, has a new TPS and a new Oxygen sensor. After these last 2 things was install (past sunday). Vehicle now doesn't sound too accellerated but I still continue having problems with the...


Dont throw it off a cliff just yet :-) Just check the vacuum line from the inlet manifold back to the transmission, ensure that fittings are air tight and that there are no holes in the line.
Explanation for possible fix:- When the car is at idle the inlet manifold plenum has a reasonably high vacuum generated within it. The vacuum line to the transmission conveys this drop in pressure to the shift solenoid. When you accelerate slowly you hardly open the throttle and the vacuum remains high in the system. The solenoid allows early shifts through to the higher gears. If you accelerat hard the throttle is open wide and hardly any vacuum is maintained. The shift solenoid, in the absence of vacuum in the line, now holds each gear for much longer allowing the engine to use its full power band.
If the inlet plenum suffers from an air leak or the vacuum line to the transmission becomes loose or a leak develops in it the solenoid reads this as if the car is accelerating hard and wants to hold each gear for as long as possible. This situation sounds like your problem so check that everything is free of any possible leak. If you find a leak and cure it not only will the shift pattern be fixed but your engine idle will be much better too.

Mar 02, 2011 | 1997 Isuzu Trooper

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I have a 2001 2500 Dodge Ram Van with a 5.2 engine. If if do not accelerate hard, the transmission shifts fine. If I accelerate hard, the transmission seems to not want to shift until I relieve pressure...


On most of these type vehicles, with the heavy duty and lower geared transmissions this is normal, when accelerateing hard it will stay in lower gear longer...

Jan 12, 2011 | 2001 Dodge Ram 2500 Truck

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We a vac line on the top of the tranny.cant find where to attached it. the new motor is reall hard to start.it pops and smells like it flooding. it came with the trotle body on the motor should i replace...


The pops and the disconnected vac(uum) line and the smell of fuel may al be related. The vacuum line to the auto transmission is there to tell that gear shift about the level of load that the engine is under. When you first start the car and accelerate really slowly notice how quickly the gear box shifts up through the gears. However if you accelerate hard the transmission holds each gear for a long time to take advantage of the high power delivered by the high engine speed. The vacuum line conveys to the transmission the level of vacuum in the inlet plenum manifold. When you accelerate slowly the throttle plates only opens a small amount and maintains a strong vacuum level. This vacuum permits the transmission to shift up through the gears quickly. If hard acceleration is demanded the throttle plate is fully open and there is almost no vacuum. The lack of vacuum on the transmission restricts gear shifts. The vacuum lie usually makes connection with the transmission on the left (facing towards the front of the car) near the selector switch. The other end of this line must make connection with a port on the inlet manifold plenum or runner (on my car the port connection is actually very close to the injector on the inlet runner towards the back of the engine). The open connection port is causing the other problems. With un-metered air entering the plenum (not passing through the throttle) the engine computer is struggling to keep the injection times long enough to keep the fuel to air mix balanced. This gives rise to very uneven running and perhaps the 'pops' and smell of fuel that you are experiencing. Locate the connection and stick the vacuum line from the transmission on it. Make sure that there no further leaks compromising the inlet vacuum. Make sure the interior of your 'new' throttle is very clean. All of these things help and add up to a better running engine.

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Try some Lucas Transmission fix. that stuff has done wonders for almost all of my tranny problems

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Transmission won't shift fron 1st, 2nd or 3rd correctly!


Sorry to inform you that it sounds like your transmission needs servicing.
Check the fluid levels and replenish if level is down.
If after doing this,the car still wont shift properly or smoothly,,then you will have to take the car into a transmission mechanic.

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1 Answer

Hard shift and blinking overdrive


The blinking overdrive button is telling u that a serious fault has occurred in the electronic controls or a mechanical fault such as excess slippage is occurring.

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