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My car will not go over 20mph unless I floor it.

Tiny
ANONYMOUS
  • MEMBER
  • 1993 MERCEDES BENZ 400SEL
  • 152,000 MILES
My car will not go over 20mph unless I floor it and once it gets over 40mph it drives normal but now it is running real bad and want pick up speed at all what could it be and I did change the spark plugs but not the wires
Thursday, February 14th, 2013 AT 11:17 PM

1 Reply

Tiny
RANDICO
  • MECHANIC
  • 174 POSTS
Something is not breathing right, from plugged air filter or pluggeg exhaust and this includes the catalytic, Here is what gets me when you get to 40MPH then it drives normal, you are describing a tranmission problem, check the transmission fluid condition if it is brownish or even blackish you truly have a transmission problem.
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Friday, February 15th, 2013 AT 4:29 AM

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