Question about 1993 Ford Thunderbird

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1993 thunderbird just put new plugs in and had cat converter on one side replaced. car starts fine but seems like it is not running on all cylinders when in gear and does not have all the power it should and uses more fuel then before. check engine lite keeps coming on and staying on longer as the car starts running rougher. please help.

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  • danstbird Jun 26, 2008

    I was thinking about that but was wondering if there is anything els it could be I did not know why the sensor might have something to do with it I was just wondering if that could be the problems. If anyone els has suggestions I will take all I can get so I can write all of them down and go down the list if need be to get to the one that works. Thanks for all the info and thank you Scooby I wish I had a snack for you.

  • danstbird Jun 26, 2008

    OK sounds good do I wish the shop that did the cat would have suggested this to begin with. do you recommend the platinum ones or factory? And by the way thank Lee.

  • danstbird Jul 01, 2008

    I am showing two more Email on this problem but they are not showing on my account WHY

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The end of one of the spark plugs might be missing....... and also try to clean the head of cylinders it might have been rusted ........also check whether fuel filter was rusty ..........this all may be the cause for consumption of more fuel

Posted on Jun 26, 2008

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Also keep in mind the PCV valve. If the cat had to be replaced, chances are the PCV valve is plugged. This can make the car run terribly also.

Posted on Jun 26, 2008

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Definetly try O2 sensor, if you replace a cat you want to replace that sensor as they usually are suppose to be replaced about every 60,000 miles or so, your car would run horrible/ not even start and would consume more fuel.
Try this first as it is inexpensive and not hard to replace.
Then go from there.
Keep me posted.
Thanks,
Lee

Posted on Jun 26, 2008

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  • Lee A.
    Lee A. Jun 26, 2008

    just your standard one will do as long as it's new it should be a great improvement. How many miles on the vehicle? I hope you found this helpful and if so I would greatly appreciate you accept and rate the solution accordingly. If you ever need anything you can go to my expert profile page and use the Ask me feature. Just Click Here for my profile page.
    Thanks and keep me updated,
    Lee


  • Lee A.
    Lee A. Jun 26, 2008

    Ya, i'm not sure I have seen this a couple times on here already. The cat getting changed without it. Especially if you don't know the history of the car you have to assume it is bad as well. The cat lasts a lot longer then an 02 sensor most of the time so... Most shops just want to get it done and go. They don't worry about letting you know of other things that should be changed or stuff like that. Sometimes they also assume that most people won't want to spend any extra money as well.
    Keep me posted.
    Thanks,
    Lee


  • Lee A.
    Lee A. Jun 28, 2008

    Hi again,
    I noticed you rate me thanks for trying. Is there something else you needed assistance with? I would think you would have found something in my posts helpful.
    Thanks again and keep me updated.
    Lee


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Was the Oxygen sensor replaced?

It could have developed a cable fault with being moved about.

Posted on Jun 26, 2008

  • Richard Perkins
    Richard Perkins Jun 26, 2008

    This would result in the ECU staying in the "cold start" mode - and ignoring the sensor untill it starts giving readings.

  • Richard Perkins
    Richard Perkins Jun 26, 2008

    If you can get to a garage that is able to do a diagnostic check - it will show no reading from there if it is.

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