Top Issue- 02-05 Ford Thunderbird Ignition Coils COP

baileysdad

Active Member
Joined
Oct 3, 2020
Thunderbird Year
2002
Original replacement parts number begin on page 216 of the owner’s manual. (I have original manual but I’m taking that page number from the pdf version.). Original motorcraft number is AGSP-32F. Years ago, Before platinum and iridium plugs, I remember having to change them, and the distributor points, pretty often. But you could access them pretty easily then too. Nothing like the nightmare packaging under hoods today.
 
Joined
Dec 6, 2020
Thunderbird Year
2005
I would definitely replace all the coils and all the the plugs too. Make sure you use never-seize on the plug threads and di-electric grease on the coil end that slips on the plugs. I usually watch you-tube videos on any project that I'm about do myself. It saves a lot of of grief.
I'd also like to say even if a spark plug looks fine there can be something wrong or weak on the inside. It happened to me on a one cylinder Kohler motor and cost me weeks of useless work and replacement parts I didn't need. I took the motor to an expert and he did everything he knew and couldn't get it started. Baffled, he just put a plug in as a last resort and it ran perfect.
That plug probably cost me a grand or so. It must have come apart inside with no signs of trouble.
Needing to replace coils on my 05. Any recommendations for a decent coil would be appreciated. Have seen them priced all over the place and am at a loss ..... Thanks!
 

Gus Gutz

Active Member
Joined
May 9, 2017
Thunderbird Year
2002
I heard that a few aftermarket coils are too tall and the cover won't properly fit. Maybe pull one of the new coils and compare it to one of the old ones. When I pulled mine, that's the first think I checked.
 

biddle

Forum Moderator
Staff member
Joined
Mar 9, 2003
Thunderbird Year
2005
Needing to replace coils on my 05. Any recommendations for a decent coil would be appreciated. Have seen them priced all over the place and am at a loss ..... Thanks!
The bold type words are links that go to the recommended products.

 
Joined
Aug 4, 2020
Thunderbird Year
2002
Thank you for the heads up. I have a 2002 and will save a big bill when I need them. Just bought then. Thanks
Hi what do the coils do that you would know that’s the problem?
My car, 2002 Tbird, it doesn’t smoothly transition into next gear, by that I mean when starting from a stop sign it jerks as it goes faster. Did, does anyone else experience this? Car is at 76,000 miles
 
Joined
Jun 9, 2021
Thunderbird Year
2002
Hi guys ! What is the difference between coil and COPS ?

Also, the link for the coils that fits ''better'' (the AD Autoparts I think), showed that they are not in stock anymore ? Anyone as another link to order those coils ? Thank you !!!
 
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Joined
May 25, 2017
Thunderbird Year
2002
My 2002 with 21K miles has developed a very noticeable hesitation under load (going up a hill) at about 1500 - 2000 rpm’s @ 35 - 50 mph. I took it to a non dealer mechanic who scanned for codes (none found). He replaced the plugs (original plugs) one was found with oil coating in the plug well from the valve cover gasket.. He suggested replacement of the valve cover gasket in the next year. He said it would take a long time for the oil to seep down into the new plug. The valve cover leak is very small. The COPS / Coils are all the original Motorcraft.. Again no check engine light or any codes stored. First question, if it was a bad coil on plug (COP) would it always trigger the check engine light or set a drive-ability code?

The mechanic seems to think it could be a clogged exhaust system on the passenger side after checking the temperature of the two catalytic converters. So down the rabbit hole we go with Cataclean trying to eliminate carbon buildup and a possible clogged catalytic converter. I just put the first bottle as directed into the tank with about < 1/4 tank of gas in the tank. I drove the bird for about 20 miles then refilled the tank. It seemed to help the hesitation some but it is still there. He also suggested it my take two application.. So I am in between the first and second application trying to burn off a tank of gas. If the Cataclean doesn’t work, then it my be a pair of catalytic converters at a very expensive price tag. They are nearly 20 years old catalytic converters. I do not smell any rotten egg smell from the engine exhaust which I think would be a sign if a failed converter.

I decided to do the second application of the Cataclean and if that doesn’t work head to the dealer who may have more experience with the T-Bird design COP’s, plugs, valve cover gaskets and possibility of no codes if no codes could be a possibility with a single coil / COP failure.

I guess driving it like you didn’t steal it could be bad for it too..

Any thoughts and thanks in advance..
 
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biddle

Forum Moderator
Staff member
Joined
Mar 9, 2003
Thunderbird Year
2005
He suggested replacement of the valve cover gasket in the next year.
I think you answered your own question here. Best case scenario, when it was discovered oil was getting into your plugs, everything in post #1 should have been addressed- https://forums.fordthunderbirdforum...-05-ford-thunderbird-ignition-coils-cop.5040/

Rather than going down rabbit holes and waiting for computer codes, why not fix what was already discovered? As my post says " Just by replacing these components, you may be able to bring new life to your engine!" If it was my car I would have already replaced all the plugs, coils and valve cover gasket which can all be done at once.
 
Joined
Jan 17, 2018
Thunderbird Year
2005
I took my 2005 T-Bird to my Ford dealership to have it checked out, the results were 3 bad coils. I had them replace all coils and spark plugs. It was expensive but I got a 24 month guarantee good at any Ford or Lincoln dealer. They gave me the 5 good coils and spark plugs for spares. MY BIRD RUNS LIKE NEW!
 
Joined
May 25, 2017
Thunderbird Year
2002
I think you answered your own question here. Best case scenario, when it was discovered oil was getting into your plugs, everything in post #1 should have been addressed- https://forums.fordthunderbirdforum...-05-ford-thunderbird-ignition-coils-cop.5040/

Rather than going down rabbit holes and waiting for computer codes, why not fix what was already discovered? As my post says " Just by replacing these components, you may be able to bring new life to your engine!" If it was my car I would have already replaced all the plugs, coils and valve cover gasket which can all be done at once.<

I wish I was mechanically inclined for such work like this... I know enough to be very dangerous! There is one thing I learned here, if you buy one of these cars or any older vintage car be prepared to work on them yourself to save money / or satisfy a need for a hobby that involves hard work and keen knowledge, or be prepared to support your cool ride and have someone else work on it.. The biggest issue is who and how do you find someone to work on it.. In some cases you can work on it yourself but are you the most qualified to do so.. I have seen another 2004 Tbird at this independent shop that I been using just recently.. They are honest and reasonable. They took care of my power steering pump when that died, and also my A/C when that just needed a charge. They are right around the corner from my house which is also a plus. But after telling the mechanic about the coil issue / valve cover issue etc. from the forum, , he said if they were bad they should trigger a code. That is the main reason he went down stream to the exhausts side. He said he would put his faith in the older Motorcraft coil-pack than a cheaper aftermarket set.

As Hawkeye said, Ford gives a 24 month warranty. I will give my Ford dealer a call and see what they say.. I had a few Mercury's over my life time and had a great Lincoln Mercury dealership whos service department was excellent. When Ford dropped Mercury, I couldn't see me driving a Lincoln at that point of my life. I may give them a call also.. I guess I am shopping around for a honest service center who can fix the issues. I will let you know how it all goes..
 
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