Question about 1999 Buick LeSabre

2 Answers

My 1996 buick lesabre thumps when accelerating over around 50 mph, usually when entering the freeway. Already replaced all 3 coil packs, fuel, oil and air filters. Is it worth it to replace the spark

I'm almost sure its not a direct trans problem since the acceleration from 0-40mph is smooth and easy.

Posted by on

  • goldfish7898
    goldfish7898 Jan 23, 2013

    Replace spark plug wires?* i just recently replaced the actual spark plugs this year



2 Answers

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Top Expert:

    An expert who has finished #1 on the weekly Top 10 Fixya Experts Leaderboard.


    An expert that got 20 achievements.


    An expert that got 10 achievements.

  • Buick Master
  • 21,873 Answers

I would want to know where the noise is coming from first.
If you had a cylinder not firing, you should get a check engine light with a trouble code stored in the computer.
It could be something hitting the exhaust pipes, a weak motor mount, or any number of other things.
Does it feel like it involves the fact you are at that speed, or the fact the engine is working very hard ?

Posted on Jan 23, 2013

  • goldfish7898
    goldfish7898 Jan 24, 2013

    the thump can be heard and felt, coming from the front of the car. My check engine light hasn't come on. I think it has to due with then engine being under more pressure, but only at higher speeds. it has never happend under 40mph, but it has happened when going up hill over 40 mph


  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

Check the front motor mount bottom of engine.

Posted on Jan 26, 2013


4 Suggested Answers

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

  • 39 Answers

SOURCE: 1997 Buick LeSabre, 54,000 miles

remove plugs and check for carbon tracing . if found plugs and wires will fix problem

Posted on Oct 24, 2009

  • 731 Answers

SOURCE: 99 Buick LeSabre stutters on acceleration, any

First thing I would do is change the fuel filter and air filter

Posted on May 23, 2011

  • 21 Answers

SOURCE: I have a 1997 Buick Lesabre Limited with a slight problem..I've replaced all three coils, new plugs and wires..The engine is a 3.8 V-6 series II..Upon acceleration, mostly, it shakes and hesitate

try some lucas fuel injector/fuel stabiliser

Posted on Sep 30, 2012

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

Fuel reset button

there is no reset button on GM's, check for clogged fuel filter and or low fuel pressure/volume

Dec 12, 2013 | 1993 Buick LeSabre

1 Answer

Replaced ignition control module on 1994 buick lesabre, now it will start, but runs crappy also replaced crank sensor, cam sensor, all 3 coil packs, spaek plugs, and front 3 wires

check fuel pressure are fuel rail? Should be 40-47 psi. Also check filter at rear frame rail near RR tire, pull vacuum line off fuel pressure regulator at intake mainfold. Should have vac. and be dry, no gas at fitting.

Aug 21, 2011 | 1994 Buick LeSabre

1 Answer

1996 buick LeSabre runs rough at 50 mph

Sounds like low fuel pressure. i.e. fuel pump, fuel pressure regulator, or fuel filter.

Jun 02, 2009 | 1996 Buick LeSabre

1 Answer

1998 Buick Lesabre How do you test the coil packs?

the coils are one integrated block with 3 separate segments. the coil pack is mounted to the ignition module and can be unbolted from each other. one can test the coils from the underside of the coilpack with a dvom. having said that your car should still start if one paired coil fails, it would however miss on one or two cylinders. I would suggest to scan for codes, monitor live sensor data to see if you have a valid crank signal, check fuel pressure and spark voltage

Nov 12, 2008 | 1998 Buick LeSabre

2 Answers

1993 Buick LeSabre is missing at 50 to 60 mph

I think the fuel filter may be starting to plug up, also change the plugs and plug wires, they are due at 100,000 miles.

Sep 23, 2008 | 1993 Buick LeSabre

Not finding what you are looking for?
1999 Buick LeSabre Logo

154 people viewed this question

Ask a Question

Usually answered in minutes!

Top Buick Experts


Level 3 Expert

76649 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22219 Answers

Jeff Turcotte
Jeff Turcotte

Level 3 Expert

8522 Answers

Are you a Buick Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides