2004 - wrench and engine light on dash

The last time I was out for a drive the Tbird kept slowing down until it was almost stopped. There was a wrench lit up on the dash. I pulled over, shut it of, restarted it. The wrench light was not on. I drove about 10 miles and the same thing happened. It drove fine in between. This time when I restarted it, the engine light on the dash came on and stayed on. I drove the 20 miles home. Parked it. Light was still on. I seem to remember it shifting a bit rough before the first incident but ran and shifted smooth otherwise.
 

Issyro

Well-Known Member
Need to put the scanner on it, easiest
The last time I was out for a drive the Tbird kept slowing down until it was almost stopped. There was a wrench lit up on the dash. I pulled over, shut it of, restarted it. The wrench light was not on. I drove about 10 miles and the same thing happened. It drove fine in between. This time when I restarted it, the engine light on the dash came on and stayed on. I drove the 20 miles home. Parked it. Light was still on. I seem to remember it shifting a bit rough before the first incident but ran and shifted smooth otherwise.
Use. A scanner to pin down the issue.....
 
Your problem is a result of one or possibly more than coil- on-plug failure creating mid- firing which the Powertrain Control Module keeps track of. When the mis-firing exceeds a threshold the wrench light comes on & the car goes into limp mode to get you to service.
 

cdbintexas

Passed away 11/09/2020
The last time I was out for a drive the Tbird kept slowing down until it was almost stopped. There was a wrench lit up on the dash. I pulled over, shut it of, restarted it. The wrench light was not on. I drove about 10 miles and the same thing happened. It drove fine in between. This time when I restarted it, the engine light on the dash came on and stayed on. I drove the 20 miles home. Parked it. Light was still on. I seem to remember it shifting a bit rough before the first incident but ran and shifted smooth otherwise.
The onboard computer will tell you what it thinks is wrong. Go to an auto parts place like Autozone and ask them to read the code and their understanding of what it means. (Free Service) Then report results here. You will get plenty of experienced advice.
 

ChairMan

Active Member
The last time I was out for a drive the Tbird kept slowing down until it was almost stopped. There was a wrench lit up on the dash. I pulled over, shut it of, restarted it. The wrench light was not on. I drove about 10 miles and the same thing happened. It drove fine in between. This time when I restarted it, the engine light on the dash came on and stayed on. I drove the 20 miles home. Parked it. Light was still on. I seem to remember it shifting a bit rough before the first incident but ran and shifted smooth otherwise.

Paul, I just went through the same thing as many others on this forum have gone through. The code it gave was throttle body control and control module. After taking it to my independent garage twice and them test driving and not getting the check engine light or wrench light to illuminate I took it home. On the way home the lights came back!! I followed many recommendations from this forum and installed new COPS and Autolite Iridium spark plugs. So far, so good. Runs better than when I bought it. It has 35k miles. BTW, the COPS, recommended by our moderator are great for the price through Amazon.
 
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WesTxStoner425

2004 Platinum over Sand interior
You should go ahead and change the valve cover gaskets, too.COPs can fail because of oil leak allowing oil to pool beneath them. Water could also be getting in, too, possibly from leakage from the wiper gasket, or from diving through deep puddles.TBH, I still need to change the wiper gasket,too. Anything pooling around the plugs is bad. Then make sure the COPs covers are secured/sealed properly. Snug them down. Oh, and put the top down, winter's over, at least in El Paso! 82° today, bright and sunny.
 

PCR59

Active Member
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