whats up everyone! I have a 13 ecoboost super crew,and have three problems. 1 I have a click in either the rear end, or u joint. I can really hear it when I put it in reverse. does anyone have this problem? 2 I started to lose mpg and im not driving hard I don't have my foot in it ever . I know its not a lot but I went from 18.6 to 18 ,and is still going down. 3 I have a studder low rpms going from 3rd to 4th . anyone can help, what I could do different that would be great thanks.

 

slack in the driveline, probably nothing, maybe slip joint to be greased. cold weather is why your mileage is slipping, my truck mpg is lower till the transmission temp gets up to normal. usually takes a good 15 minutes, engine comes up pretty quickly. this also may have something to do with the shudder. where are you located, colder states have a winter blend fuel.

 

Usually greasing the teeth where the drive shaft inserts into the transfer case fixes the click, but wares off after time!

Mpgs will dropp in the winter, thats normal winter blend gas does this.

Shudder may be caused by bad plugs, or incorrect gap on them!

 

TODDMAN Speaks the truth.

My mileage sucks in the winter time too. Its down to 14.2 average while it sits around 17 in the summer.

 

i live in new hampshire. also im running the stock plugs with 26,000 on it should i change them

 

I'd pull them and get new plugs installed. Make sure they are gaped correctly.

 

My ford truck and van with efi use more fuel during the cold months due to the increased density of the colder air.

 

should i replace with stock plugs, or something different .anyone know what the gap should be? when i get my oil changed i do lube,oil,filter, and air filte.r should i have them do anything else ?

 

No, it's because of winter blend fuels. Denser (colder) air actually increases engine efficiency.

But people also sometimes forget that the colder air causes the ECU to keep the fuel mixture richer during warm up, which takes longer in colder climes/months. All the "little things" can add up to lower mpgs, like a bit of spinning tire syndrome on ice/snow/etc.

Sounds like you're about normal OP...

 

Motorcraft SP-534 they come gapped at .030. I'd check them to make sure before installing them.