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Bad Coil Pack? S70 1999

posted by  someone claiming to be Andrew Chung on  Sun Aug 28 15:40 CST 2005 [RELATED]

I have a S70 GLT 99 model and recently i noticed the car was idling as if i was missing here and there but it got much worse. Then the check engine light went on. It idles rough almost like its going to die but it never does. I thought maybe a plug was bad. I checked the oil but there is no dead plug and there is no gas smell in my oil. The plugs are only 9,000 miles old. Oil level is at max and i use mobil 1 synthetic.

I was thinking that with only 45,000 maybe a coil pack is bad? Any ideas? I have to take it in as soon as i can get an appointment.

Andrew








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    Bad Coil Pack? S70 1999

    posted by  someone claiming to be ksg on  Mon Aug 29 02:44 CST 2005 [RELATED]

    I would look carefully for a vacuum leak, particularly in the air hose that goes between the air filter and the throttle body.








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      Bad Coil Pack? S70 1999

      posted by  Newbie on  Mon Aug 29 05:03 CST 2005
      Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
      last visit: Wed Jun 11 19:55 CST 2014
      [RELATED]

      Hey, thanks for the idea. I got a call from the dealer, it was a bad coil, i thought it might be but 45k miles is very low so i was surprised. But ur right about the vaccum. Is that a normal problem to look for?

      I feel aside from being built like a tank, this is the most unreliable car i have ever owned, except for my parents, Fords of the past. I am always fixing this thing.

      Appreciate ur help by the way....thanks for sharing ur knowlege!

      Andrew








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        Bad Coil Pack? S70 1999

        posted by  someone claiming to be ksg on  Mon Aug 29 05:53 CST 2005 [RELATED]

        Vacuum leaks are a common problem and have been since time immemorial on cars. Sometimes a hose works loose, or it ages and cracks, or a check valve is present that sticks. Sometimes a hose gets blocked with crud and then vacuum will not get where needed.

        With modern fuel systems that derive the amount of fuel injected from some measure of the intake air flow, air that gets in via an abnormal route is not going to be measured by the air flow sensor(s). Then the air/fuel mixture will not be right. If bad enough the engine managment system will not be able to compensate and some symptoms will develop and/or you will see a malfunction (check engine) light.

        A visual inspection under the hood once in a while can be a good preventive measure.








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          Bad Coil Pack? S70 1999

          posted by  Newbie on  Mon Aug 29 06:13 CST 2005
          Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
          last visit: Wed Jun 11 19:55 CST 2014
          [RELATED]

          Thanks for the info. Now that i know that coil packs can go bad at, 45k miles how do i figure out which one it might be in the future ...quickly? Will an OBDII device tell me which plug is not working?
          Otherwise i would have to pull each plug and check it. Or is the a cheap easy way to find which coil pack is bad?

          Does anyone know when coil packs normally go bad? 45k miles seems short....any ideas?

          Andrew








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    Bad Coil Pack? S70 1999

    posted by  someone claiming to be Andrew Chung on  Sun Aug 28 15:43 CST 2005 [RELATED]

    I forgot to add that once i get out of idling and up to speed there is no more rough idling and i dont notice anything wrong with the car.

    Andrew







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