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N2WET
New User
Mar 14, 2013, 8:46 PM
Post #1 of 6
(1488 views)
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I have a 1997 Chrysler Concorde 3.5 V6, that has been running great up until yesterday morning. When I started it up, I immediatley could tell it was ideling rough. Then after driving only a couple of miles it started cutting out very badly, shaking the entire car violently. If I accellerated more it would clear up and run fine. The problem seemed to be only when cruising at low rpm with a slight load on the engine. As soon as I start up a hill and it shifts down and raises the rpm a bit, it quits "chugging". That and the rough and low idle, (idles around 400-500 instead of the usual 900). It also threw a code during this initial drive which I checked and found to be a "cylinder 3 misfire". I checked the compression on that cylinder and it was at 145psi, which for an engine with 145,000 miles I thought was acceptable. So I figured it was probably a coil pack, which I replaced. I also replaced the spark plugs since they needed changing anyway. But when I drove it the only change was that it failed to throw a code this time. It still had the low rough idle and violent misfiring on low rpm with a load. One more thing that might be connected. It had the same idling issue once before about 6 weeks ago on a morning when it was around zero outside. But it cleard up after a few minutes and has been fine since until now. Anyone have any ideas??
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 15, 2013, 3:12 AM
Post #2 of 6
(1447 views)
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Re: Engine Misfiring
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Are you sure that you identified the correct cylinder?
What about the plug wires?
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
(This post was edited by Hammer Time on Mar 15, 2013, 3:12 AM)
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N2WET
New User
Mar 15, 2013, 7:02 AM
Post #3 of 6
(1427 views)
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Re: Engine Misfiring
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Interesting? I found, and used, that same diagram except the one I had showed the front of the engine being the opposite of yours. I thought at the time it was odd that they would have the front at the top. And no I have not changed out the wires yet. I am hoping to identify the part needed so I do not just keep throwing parts at it in an attempt to fix it. I know it could be the wires, the IAC valve, a fuel injector, or something I am not thinking of. My diagnostic skills are limited so I am hoping someone here with expertise in these areas can lead me to the part that is most likely the problem. Otherwise the wires will be next. Thanks for the reply. I will be checking the correct #3 cylinder now that you provided the right diagram.
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Hammer Time
Ultimate Carjunky
/ Moderator
Mar 15, 2013, 8:22 AM
Post #4 of 6
(1418 views)
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Re: Engine Misfiring
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Plugs and wires are normal maintenance and should have been done long before a problem appeared and long before you changed a coil as you already have.
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We offer help in answering questions, clarifying things or giving advice but we are not a substitute for an on-site inspection by a professional.
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N2WET
New User
Mar 15, 2013, 1:32 PM
Post #5 of 6
(1399 views)
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Re: Engine Misfiring
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Yes I realize that. I just recently inherited the vehicle from a relative that passed away. So I really do not have any idea what they kept up with other than oil changes. From the looks of the spark plugs, they have not been changed for awhile. That is why I went ahead and changed them when I changed the coil. When I got the car, I changed all the filters and fluids, as I routinely do with any used vehicle I get. Wires will be next on my list. But it is an older car with a lot of miles, so I do not want to dump a lot of new parts into it to try to fix this problem. If this problem turns out to be a major issue. It will be headed for Craigslist.
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