New Coil and Plug

[LSV8FAN]

Last weekend while driving on the interstate, the car was like hesitating/bucking/misfiring when accelerating from 55 mph or higher to a higher speed. Had it at the dealer this morning, they did a stress test on the coils and found #2 to be bad. Coil and plug were replaced; will need to check if that solved the problem. We couldn’t feel that there was a problem while in-town driving, speeds between 35-50 mph or when accelerating from like 30 to 40 mph; the issue showed itself at above 55 mph. There were no “Service Engine Soon” lights and apparently no codes set.

Car has now 58K miles; back in Sep. 2010, at 39K miles, coils and plugs #’s 4 & 8 were replaced. Work done under warranty (Ford covers those coils for 10 years or 100K miles – Programs 07M07 and 07N09).

 

[stugots]

Last weekend while driving on the interstate, the car was like hesitating/bucking/misfiring when accelerating from 55 mph or higher to a higher speed. Had it at the dealer this morning, they did a stress test on the coils and found #2 to be bad. Coil and plug were replaced; will need to check if that solved the problem. We couldn’t feel that there was a problem while in-town driving, speeds between 35-50 mph or when accelerating from like 30 to 40 mph; the issue showed itself at above 55 mph. There were no “Service Engine Soon” lights and apparently no codes set.

Car has now 58K miles; back in Sep. 2010, at 39K miles, coils and plugs #’s 4 & 8 were replaced. Work done under warranty (Ford covers those coils for 10 years or 100K miles – Programs 07M07 and 07N09).

It's really best to do all the coils and plugs at the same time. A weak one will put stress on the new ones resulting in a constant cycle of chasing marginal coils. I went through the dealer as well with this warranty. With enough pressure you can get them to change them all out.

 

[LSV8FAN]

It's really best to do all the coils and plugs at the same time. A weak one will put stress on the new ones resulting in a constant cycle of chasing marginal coils. I went through the dealer as well with this warranty. With enough pressure you can get them to change them all out.

Thanks for that input. I'll try to get the dealer to replace all next time one goes out.