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2004 Chrysler Concorde Question: What would cause the engine to "buck" when during sudden acceleration?

 

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bham311, Rincon, GA, April 24, 2013, 18:13
 Rookie

When passing or attempting to accelerate quickly the entire car "bucks", it's not a stutter or hesitation but rather it feels like the car is going to stop dead in its tracks. It only lasts a split second then resumes normal operation. I have recently had cam and crank sensors replaced with OE parts, water pump, timing belt and coil packs have also been replaced. The only other issue is that the car will stall frequently on start up or when in heavy traffic.

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  • Answer #1

    April 26, 2013, 18:27
     Master

    Any chance wiggling the key in the ignition switch aggravates the symptom? When it stalls , does it start right back up? When it 'bucks' on you out on the highway , do the guage lights all flicker?

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    04Concorde_owner, September 29, 2013, 18:38
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    Curious about your thoughts on the writer's problem. My '04 Chrysler Concorde bucks badly when going down the road. It usually doesn't do it at slow speeds. My dash lights have flickered a few times but haven't done that recently & I don't remember it being simultaneous to the bucking. We had a sensor replaced (cam I think?). A couple of times it has totally died while going about 55. It will also drive fine for 5 miles but after sitting 15 or 20 minutes it won't start. I sit and wait another 10 or 15 and it starts up. Usually it goes fine for the first 15 miles or so city and highway. Two mechanics have looked at it and can't figure it out.Yesterday it stalled while waiting for a train and then didn't start up immediately. It took 3 or 4 minutes and seemed fine after that. Any ideas?

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    tslater2, May 05, 2014, 17:15
     Rookie

    did you find the problem, i am having the same issue

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    04Concorde_owner, May 07, 2014, 06:01
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    No I didn't. I still own the car and hope to get it back on the road eventually. It has low mileage for its age and is in decent shape otherwise. Would love to hear how anyone else resolved this problem. Good luck with yours!

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    bham311, May 07, 2014, 06:31
     Rookie

    I've had several mechanics look at mine also. The latest "theory" is that the oil pick-ups at the bottom end of the motor are clogged? I'm still looking for an answer.

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    04Concorde_owner, May 07, 2014, 19:18
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    I wondered if it might be an electrical problem since mine did have unexplained flashing dash lights too. Maybe that's unrelated though as it didn't always happen, just intermittently. I wish there was a mechanic out there who could figure this out for us. I see online that it's a common complaint. Seems someone would know the cause by now. Good luck to you too bham311

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    bham311, May 08, 2014, 14:16
     Rookie

    One other thing that I forgot to mention in my list of thing that I've tried. I also had the timing belt replaced, and two different shop set the timing per specs. After the first shop set it and I drove the car for two weeks and the "bucking" started again, the second shop pulled the front cover and timing was off...the second shop set it and after about a week the problem reared it's ugly head again. Again the front cover was pulled and again the timing was off. Possible crankshaft issue??

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