My extended factory warranty ends next week. I had the 7 year 100K premium warranty and thankfully never needed it. The only issues I had the dealer fix so far was the transmission at 57K for the shuttering TSB. The only issue I have now is that one of the rear window vent motors clicks when it closes. The A/C vent motor has made a few weird noises when switching modes but other than that all is good. Because of fuel costs, I picked up a smaller and cheaper car to wear out so I haven't driven the expedition as much as I planned on.
I haven't changed the spark plugs yet, but it sounds like no warranty will cover breakage anyway, so I'll either do it myself or have a trusted mechanic do it for far less. I have access to a scanner, but I'm not sure if it will show any ignition coil problems that could be developing.
Any advice on things to check before my warranty expires?Thanks

 

A scanner that shows pending codes will tell you if there are any misfires.

 

Good advice. Will check for pending codes. I was reading on the internet some and it seems that some people that have coil problems experience a shudder at highway speeds when letting off the gas. If no codes are pending, are their any tell-tale indicators?

 

The shudder is a misfire and will show up in the data log as a potential pending code - it is recorded as a misfire and added to the log for comparison to the limits to set the code. The shudder from a misfire doesn't usually show itself when you let off the gas, it happens while you are on the gas under slight load.

 

I did not extend the warranty. They wanted at least $1,400 for any plan and I didn't see it worth it. I didn't have any pending codes, so its all on me now. I will be changing the spark plugs in the next couple of thousand miles.