Question about 1998 Mercedes-Benz C-Class

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After engine replacement all is fine except for durring passing attempts/full throttle situations at road speed. Upon backing off the throttle the RPM stays high while the car speed seems to slow.

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  • C Hamill Oct 14, 2009

    I'm an engine rebuilder/mechanic,but not familiar with Mercedes,so I had an associate run the scan,no codes..everything is original equipment,the engine was worked over and re-installed,in all other situations the car runs like a dream,it just seems to have a very delayed up shift after kicking down into a passing attempt.what else should I be looking at?

  • C Hamill Oct 16, 2009

    Everything is original equipment,only the engine was R&R'ed ,I did jet wash the plenum as a whole unit,is there any sensors in it that control tranny operation? The car runs like a dream,and up-shifts normaly from a stop...it only delays shifting after passing attempts.

  • C Hamill Oct 16, 2009

    No real help so far,need to know why up-shift is delayed after passing attempt.

  • C Hamill Oct 17, 2009

    The tranny worked perfectly before the engine rebuild,and works perfectly unless a kick-down/pass attempt is made...then its very slow to up-shift. From a standing start at full throttle it shifts fine,no codes at all. Very puzzling

  • C Hamill Oct 20, 2009

    The only thing changed was a rebuild of original engine,and it runs like a champ...from a dead stop and full throttle the car shifts normaly,but in a passing attempt it downshifts fine but when the pedal is lifted ther is a delay before it upshifts. Are there any vacuum over electric sensors or actuators I need to look at?

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5 Answers

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  • Master
  • 10,515 Answers

Hi,

It seems to be a bad Camshaft or Crankshaft sensor. The best way to narrow down this problem would be , take the car to the auto zone. Get it scanned for error codes. I am positive, you would get some codes, that would help us to fix the problem as i do not want you to troubleshoot everything from A to Z.

Let me know, if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Posted on Oct 20, 2009

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  • Mercedes-Benz Master
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This sounds like a transmission problem,not a engine problem.Have the fluid checked,to make sure the fluid was not lost in the changing of the transmission.The transmission is not pulling,have the fluid checked,if that is fine,it may need a filter,and fluid change.If there is a solenoid,or vacuum left off,this could cause the problem,but doubtful.I hope this was some help,if so,please let us know,thank you.

Posted on Oct 18, 2009

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  • Mercedes-Benz Master
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This sounds like you have a slipping transmission, 1st make sure the fluid id full, check it hot only the next thing to do is have a diagnostic trouble code test run on the engine and computer systems for any faults that may show up to explain this, and last but not least have a transmission repair shop road test the car and give u a report, most will do this for free in hopes they can get the job is something is wrong, but once again based on what u say the transmission is slipping, really nothing else can explain this symptom.

Posted on Oct 16, 2009

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  • Master
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Sounds more like a transmission issue to me , tell me more about it "youdoit"

Posted on Oct 15, 2009

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  • Master
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Did you take the computer from the parts vehicle also? You will need the computer that came with the engine. Also tranny has to be the same. Check actuator to make sure it is not leaking. I also recommend running an engine code scan to see if it comes up with anything.

Posted on Oct 14, 2009

  • Nate Stansfield
    Nate Stansfield Oct 16, 2009

    Throttle position sensor or tranny actuator is leaky. I would do a vacuum pressure test as well as test the electronical circuits as well with an ohmmeter.

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