2005 running rough

biddle

Forum Moderator
Staff member
Joined
Mar 9, 2003
First, you need an OBDII reader to read any pending codes, some of the advanced readers may also have suggestions.

Next, you should have noticed when you were creating this thread, there are a number of posts about this. Check out similar threads above and below and also use the search page for rough idle, running rough, etc. Could be all sorts of things causing the issue related to the throttle body area as noted in this post- https://forums.fordthunderbirdforum.com/threads/2005-rough-idle-reprogram-question.8580/post-54598


Also, how old are the COPS? Most people have to replace those, spark plugs and valve cover gaskets. The fact they said they "checked" the COPS makes me wonder about this.


Also, I removed "50th Anniversary Edition" from your subject. This isn't really relevant to your issue at hand.
 
Last edited:

Anewaltj

Active Member
Joined
Aug 17, 2017
Thunderbird Year
2005
My 2005 50th Anniversary Edition was been running rough and misfiring for a while now. I’ve had new spark plugs put in, the coils checked. One garage said they repaired a crack in the driver’s side valve cover, that didn’t fix the problem. The check engine light has not come on. I would appreciate any suggestions. Thank you.
Happy New Year!
I have a 50th anniversary which I've had for 4-1/2 years, 47k miles.
It ran fine... mid last year I bought new plugs and coils and boy what a difference. If you search the site, there is a listing for the latest coils found on Amazon. I had mine put in for about 3 hrs. of labor. definitely worth it. I also replaced the struts with KYB's and they made a big difference in the ride and handeling.
As you read this blog, you will see that most all engine misses are cured by new coils.
These cars are getting to the age where they need a little maintenance but, they are worth the investment if you enjoy driving them.
Jim from Asheville
 
Joined
Apr 2, 2021
Thunderbird Year
2005
First, you need an OBDII reader to read any pending codes, some of the advanced readers may also have suggestions.

Next, you should have noticed when you were creating this thread, there are a number of posts about this. Check out similar threads above and below and also use the search page for rough idle, running rough, etc. Could be all sorts of things causing the issue related to the throttle body area as noted in this post- https://forums.fordthunderbirdforum.com/threads/2005-rough-idle-reprogram-question.8580/post-54598


Also, how old are the COPS? Most people have to replace those, spark plugs and valve cover gaskets. The fact they said they "checked" the COPS makes me wonder about this.


Also, I removed "50th Anniversary Edition" from your subject. This isn't really relevant to your issue at hand.
The COPS were replaced 6 years ago when I bought the car.
 
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