P0304 Thought I Had a bad transmission??

[fishbone1]

My Cylinder 4 Coil on Plug is what was causing my car to shudder at 1700 rpm under a light load. Appaently it had been going bad for a while but wasn't bad enough to cause a CEL. The coil finally got so bad it tripped the CEL and I was able to find it. I then switched COP 4 with COP 1 and got a PO301 error. I installed a new COP and car runs and shifts smooth. Now if I can get rid of the ABS, TCS, and Brake warning lights I will be much happier. I swapped out the right front hub and speed sensor. I will do the left front in the next couple of days. This car`is a continuous ed class in auto maintenance.

 

[Redwingvksm]

2. Things come to mind.

First thing is that since one coil has went bad - get ready to replace all of them.

Second thing is that for the wheel speed sensor why not just pay for the dealer to do a scan on the ABS system and get to the exact problem instead of having to swap out parts n' stuff!

Good job on finding it though. All FORD missfire counts are sloppy at best. You can pull a spark plug and leave it for a few key starts - than you might get a check-engine code...

 

[fishbone1]

I swapped out the right front hub because the bearing was bad. Figured while I was doing one I may as well do the left one also. I talked to the local Ford dealer and they wanted $160 to diagnose my car. $80 per system. If the left one doesn't take car of the problem I will take it to Ford. I would really like to know the car is fixed before I sell it.