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Noted surge and bucking

Tiny
DODGEMAN58
  • MEMBER
  • 2000 DODGE AVENGER
  • 3.2L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 211,500 MILES
While driving at 45 mph on level road and a slight deceleration the motor will surge an buck. Why so?
Saturday, October 27th, 2018 AT 1:31 AM

11 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,513 POSTS
Hello,

It sounds like it could be misfiring. Can we run the codes to see what comes up? Here is a guide:

https://www.2carpros.com/articles/checking-a-service-engine-soon-or-check-engine-light-on-or-flashing

Please run down this guide and report back.

Cheers, Ken

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Sunday, October 28th, 2018 AT 5:17 PM
Tiny
DODGEMAN58
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  • 6 POSTS
Ken. I stopped by an auto shop and a code reader will not get codes as the check engine light is not on. No codes to get. Thoughts?
Thanks
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Wednesday, October 31st, 2018 AT 2:19 AM
Tiny
KEN L
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I would start with a good OEM part tune up and service the throttle bore as well. Here are two guides that will help you get started:
https://www.2carpros.com/articles/how-to-tune-up-a-car-engine

and

https://www.2carpros.com/articles/engine-hesitates

Please run down these guides and report back.

Cheers, Ken
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Wednesday, October 31st, 2018 AT 11:29 AM
Tiny
DODGEMAN58
  • MEMBER
  • 6 POSTS
Thanks Ken. Will take your advice. Let you know asap. Dodgeman58
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Wednesday, October 31st, 2018 AT 8:05 PM
Tiny
KEN L
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Please do :)
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Thursday, November 1st, 2018 AT 12:58 PM
Tiny
DODGEMAN58
  • MEMBER
  • 6 POSTS
Ken. I changed plugs and wires. Was not the solution. What do you think about the vehicle speed sensor casing the problem?
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Friday, December 21st, 2018 AT 1:43 AM
Tiny
KEN L
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It would through a code if the sensor was causing problems. It sounds like the MAP or clogged fuel filter. If the MAP becomes weak it will give a false reading to the computer without setting a code. Here are the locations for both below with a guide to walk you through the filter change:

https://www.2carpros.com/articles/how-to-change-a-fuel-filter

Check out the diagrams (below). Please let us know what happens.

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Saturday, December 22nd, 2018 AT 12:11 PM
Tiny
DODGEMAN58
  • MEMBER
  • 6 POSTS
Thanks Ken. Will change both and let you know.
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Saturday, December 22nd, 2018 AT 7:27 PM
Tiny
KEN L
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Please let us know what you find. We are interested to see what it is.
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Monday, December 24th, 2018 AT 11:31 AM
Tiny
DODGEMAN58
  • MEMBER
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Ken. I changed the fuel filter and MAP sensor. Still the same. The problem is when going down hill the car is bucking, no load on the motor. What mechanism slows the car down when on cruise control going down hill? Done does not increase. Does the transmission brake? That is what the symptom feels like. Thanks
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Tuesday, January 15th, 2019 AT 7:38 PM
Tiny
KEN L
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Yes, the transmission does hold the engine to the car when decelerating. Have you serviced the transmission recently? If not here is a guide to help walk you through the steps:

https://www.2carpros.com/articles/how-to-service-an-automatic-transmission

Can you please shoot a quick video with your phone so we can see what it is doing? that would be great. You can upload it here with your response.

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Wednesday, January 16th, 2019 AT 2:00 PM

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