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1998 Chevy Lumina Stottering at 40-45 mph

Tiny
MAD KING
  • MEMBER
  • 1998 CHEVROLET LUMINA
  • 6 CYL
  • FWD
  • AUTOMATIC
  • 170,000 MILES
Hello,

My 1998 Lumina 3.1 runs great with its 170 000 mls on it except when I go to 40 mph the engine starts shaking and I can feel it on the gas pedal. When I go slowly over 45 up to 50 mph it disappears. That is a weird thing. What can it be?

Thank you

No error code and no engine light on
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Monday, November 1st, 2010 AT 12:15 PM

10 Replies

Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Steering or suspension, bad tire somewhere? Does rotating the tires make any difference? Thanks for the donate.
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Monday, November 1st, 2010 AT 12:27 PM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
Thank you for your response. There are new tires on it. Just 3 weeks old with balancing and alignment.
It doesn't feel like it is coming from the tires but from the engine.
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Monday, November 1st, 2010 AT 12:34 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Inspect the motor mounts. Did the problem start after the tires were replaced?
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Monday, November 1st, 2010 AT 1:23 PM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
Motor mounts are fine and it did start after we change the transmission fluid and filter. Using MaxLife from Valvoline
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Monday, November 1st, 2010 AT 1:59 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Did the problem start after you had the work done?
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Monday, November 1st, 2010 AT 2:07 PM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
No, about 2 weeks later.
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Monday, November 1st, 2010 AT 2:20 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Close enough, tires--suspension or steering is my only thought at the moment.
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Monday, November 1st, 2010 AT 2:47 PM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
It is def. Coming from the engine, because it is the most when I go over a steep bridge. It feels like the engine doesn't get much gasoline. Fuel filter is brand new too.
But why only at speed around 40?
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Monday, November 1st, 2010 AT 2:52 PM
Tiny
JDL
  • MECHANIC
  • 16,098 POSTS
Maybe a tranny issue, does it down-shift? If you downshift does the problem go away?
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Monday, November 1st, 2010 AT 3:04 PM
Tiny
MAD KING
  • MEMBER
  • 25 POSTS
Didn't try it, but I can down shift.
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Monday, November 1st, 2010 AT 3:05 PM

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