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  • Engine runs rough - vibration at idle

    I've got an '05 EB with 44K miles that I drive almost every day. About a week ago I noticed I could feel a slight vibration in the steering wheel when stopped with the engine at normal idle. Moving the gear selector to neutral made the vibration disappear. The next thing to get my attention was a slight engine roughness on rollback from high to normal idle RPM on a cold startup.

    Well of course that set the Spidy Senses to high tingle and ramped up the paranoia level to +3 (normaly I'm only twice as paranoid as the average person.) The next fear factor generator was the realization that normal acceleration gear changes didn't always have that silky smooth (gotta love it) Thunderbird feel. Now I'm really worried! I'm not paranoid, there really is something wrong with my beautiful Thunderbird. (I shudda' been so attentive to my ex-wife, maybe I'd still be married - - but that's another story best shared over cold beer and hot spicy nachos.)

    I called a friend who is a certified card carrying lifetime designation gearhead to see if he had any ideas. He asked if I regularly used a fuel injector cleaner - you know, the little bottle of stuff you add to an almost empty fuel tank before gassing up. Me, "well, somethimes." Him, "idiot!" "You can use an injector cleaner every 3 thousand miles, or about, or you can have an injector or sensor problem." "You choose."

    His recommendation was "Chevron Techron" because it contains polyeither amine (PEA) rather than simply a fuel solvent like the others.
    Well guess what folks! I used a bottle of Techron per directions and 3 days later the vibration was gone and my beautiful black bird had that silky smooth Thunderbird feel again.

    I intend to keep using Techron - there's info on line if you are interested. And Autobarn has a 6 bottle special price of $6.49 - probably cost $9+ at gas stations.
    sigpicRIDGE TOP PERCH FOR A THUNDERBIRD

  • #2
    Re: Engine runs rough - vibration at idle

    Tom:

    Are you running with regular 87 octane or premium 93?

    I'm not certain but I think the premium already has that additive in it.

    I have 47,000 miles on my '05 and it has never run on anything other than 93 octane. Also, I have never experienced what you describe.

    Bronzebird
    2020 CanAm Spyder
    2021 Subaru Outback

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    • #3
      Re: Engine runs rough - vibration at idle

      Rick Rae,

      I usually run mid grade - guilty of sometimes buying off brand stuff in a pinch - and you are correct that some fuels, Texaco, Chevron, and Caltex, do have Techron. Others have something called DC, which didn't seem as good in what I read online. The bottled Techron is a 10x concentration.

      BTW, I have a sister living at Tara Estates in Loganville. Debbie Wallace - she's a Nurse Anestitist (sp?) at Gwinett Co. Hospital

      Tom
      sigpicRIDGE TOP PERCH FOR A THUNDERBIRD

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      • #4
        Re: Engine runs rough - vibration at idle

        Tom;
        Did you chech the COPS?

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        • #5
          Re: Engine runs rough - vibration at idle

          Originally posted by capete View Post
          Tom;
          Did you chech the COPS?
          Lots of opportunities here in the "hill country" to give her a kick on the incline - never noticed any roughness under load - just the low end problem, which seems to be gone now.

          Tom
          sigpicRIDGE TOP PERCH FOR A THUNDERBIRD

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          • #6
            Re: Engine runs rough - vibration at idle

            Tom:

            Just drove by Tara estates this morning. Here is a bit of trivia about that place.... I'm sure your sister has mentioned.

            Tara was the name given to a huge mansion with massive white pillars located on highway 81 just south of Loganville. Back in 1988 it was purchased by Burt Reynolds and was to be the home of he and his new bride, Loni Anderson. Apparently they only lived in it a short time before their marital woes began and the place was either sold or lost in one of Reynolds bankruptcies.

            The grounds then were cut up and a subdivision now surrounds the mansion.

            Bronzebird
            2020 CanAm Spyder
            2021 Subaru Outback

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            • #7
              Re: Engine runs rough - vibration at idle

              Tom, it's been a long time ago, but I seem to remember that the first time I noticed the slight shudder at a red light, it was the beginning of my COP problems. It became progressively worse, but was intermittant for several years. I finally got the code stored right before the extended warranty expired. They replaced #'s 3. 5 and 8.

              After that, CARTOY ran better than she ever had. Of course, she'd had her computer updates, too.

              Now, within the last two days I'm feeling that slight shudder at red lights again. I'm sure it's at least one bad COP.

              I have two full sets of COP's and the correct gaskets for one of them. I'll try your suggestion of the additive, and hope that takes care of it.

              Regardless, I always use at least 91 octane. If I have the time, and the pump shows 93, I split it between 93 and 89. I drive a lot, so I'm sure it saves me a significant amount of cash over the year.

              Redbirdsal
              sigpic
              Native Texan
              IRISH THRU & THRU!

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              • #8
                Re: Engine runs rough - vibration at idle

                Sally,
                The fuel octane is probably less important than the quality of the cleaning additives in the fuel - they all have something, but there is a difference between brands. The onboard computer will adjust the spark timing to match the fuel octane and prevent detonation (engine knock). And unless you put your car on a dynamo you would not likely notice a difference in power / response. But fuel injector system deposits and sulphur build-up on oxygen sensors are very noticable. Volvo and Mercades Benz have service bulletins for engine roughness detailing Techron as a possible remedy.

                Tom
                sigpicRIDGE TOP PERCH FOR A THUNDERBIRD

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                • #9
                  Re: Engine runs rough - vibration at idle

                  I started to have the same problem .Slight miss at idle and a slight miss at 45mph under load.My thinking more electric so a COP problem.Stopped at L/M service and the service writer said the same.I'll bring it in next week.Premium or regular ,just read an article today while getting an oil change on the Caddy.At $2.05 for reg. and $2.25 pre. at 15,000 mi. per yr . the savings is about $172. per yr. Is it worth it ??? Article was written when gas was at that price.
                  sigpic

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                  • #10
                    Re: Engine runs rough - vibration at idle

                    Ed,
                    I don't have research based knowledge on the fuel octane vs. price and value question, but a long time friend I flew with at USAirways told me that with over 80K miles on his '06 Jag, he has tested and not been able to verify any power / response difference between regular and premium fuels. He didn't think the MPG justified the cost of premium either. He said the fuel /power chart differences are so concentrated at the extreme high end of performance that it very unlikely that any driver who is not on a race track would notice a difference between regular and premium.

                    That all I have on the subject - my choice is "buy regular" and save money.
                    sigpicRIDGE TOP PERCH FOR A THUNDERBIRD

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                    • #11
                      Re: Engine runs rough - vibration at idle

                      cops problem, it will get worse...

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                      • #12
                        Re: Engine runs rough - vibration at idle

                        COPS problem for sure. I just went down that road, #4 failed, replaced it, then # three, replaced all on the right bank. Less than a week later #8 went, replaced all on the left bank. Problem solved, lucky for me I have a mechanic friend that got them for me at cost.

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                        • #13
                          Re: Engine runs rough - vibration at idle

                          dbsupercrew, what brand of COP are you using?

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                          • #14
                            Re: Engine runs rough - vibration at idle

                            Originally posted by austx View Post
                            Sally,
                            The fuel octane is probably less important than the quality of the cleaning additives in the fuel - they all have something, but there is a difference between brands.
                            Tom
                            I agree, and and am sorry for not mentioning that. I use Chevron,Shell and Conoco for the most part. If I'm in an E TX country area that has a Brookshire's Grocery, I always fill up. My Lincoln gets more miles per gal on it.

                            Redbirdsal
                            sigpic
                            Native Texan
                            IRISH THRU & THRU!

                            Comment


                            • #15
                              Re: Engine runs rough - vibration at idle

                              I, too am starting to get a rough idle after 57,000 miles on my 2002. So far, no check engine light has come on. I hate to take it to the dealer and have them say that there is no code registered. Can the error codes show up in the computer if the engine light doesn't come on?

                              This is an intermittent problem--maybe every second or third time I drive the car. Accelerating up hills doesn't provoke the miss, but once on a long uphill grade, I noticed a miss or two. I'm going to try a bottle of Chevron fuel system cleaner as soon as my tank gets a little lower. I guess it can't hurt.

                              Do you think this is the beginning of a COPs problem? Interesting that this started happening just as my 7 year warranty ran out. BUT, I put another 4 year/48K policy on it, so I should be covered (except for the inconvenience). Rats!

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