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1997 Buick Lesabre engine stumbles

Tiny
JILLA
  • MEMBER
  • 1997 BUICK LESABRE
  • 3.8L
  • V6
  • FWD
  • AUTOMATIC
  • 152,436 MILES
When I start and drive the engine stumbles sometimes not all the time though. No check engine light on. I think it might be the one of the coils or the wires and plugs. I need a second option or need to know if I'm correct on the problem before I start buying parts. Thank you
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Tuesday, December 17th, 2013 AT 8:31 AM

8 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
If the vehicle is due for a tune up, it won't hurt to do it. However, 99% of the time, an engine misfire due to a coil, plug, wire. Will set the check engine light which will indicate which cylinder is misfiring. I guess what I am saying is that I can't say for sure that is going to take care of the problem.

Have you checked fuel pump pressure? Have you checked for engine vacuum leaks?
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Tuesday, December 17th, 2013 AT 8:51 AM
Tiny
JILLA
  • MEMBER
  • 46 POSTS
Yea theres no check engine light on at all. But I just check the plugs and wires And when I pushed on the the #5 plug and wire on the engine and not the coil pack the engine stumbling stops so I believe its may be the plug because I changed that wire.
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Tuesday, December 17th, 2013 AT 10:27 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Pushing on the wire won't affect the plug. The problem is in the wire. Do you have one to switch it with? If so, try that and let me know what happens.
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Tuesday, December 17th, 2013 AT 10:36 AM
Tiny
JILLA
  • MEMBER
  • 46 POSTS
Yea I changed the wire but it still does the same thing
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Tuesday, December 17th, 2013 AT 12:08 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
So, when you push on the plug wire, it runs better, but the plug wire isn't the problem?
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Wednesday, December 18th, 2013 AT 6:36 AM
Tiny
JILLA
  • MEMBER
  • 46 POSTS
It was the wire, it was resting on the o2 sensor. Thank you for all the advise.
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Wednesday, December 18th, 2013 AT 3:25 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,747 POSTS
Glad you found the issue. Take care and let us know if you have questions in the future.

Have a great Christmas,

Joe
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Thursday, December 19th, 2013 AT 5:26 AM
Tiny
JILLA
  • MEMBER
  • 46 POSTS
Thank you and you have a beautiful holidays
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Thursday, December 19th, 2013 AT 7:54 AM

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