Wicked46

Anyone see a decrease in fuel mileage after installing a catch can on there ecoboost?? It doesn't make sense to me. I also cleaned both MAP sensors at the same time since they were coated in oil... I'm seeing a 1.2 MPG drop in fuel economy.

GetYaFordOn

Blocked PCV lines will do that.

scott.0691

What type of catch can did you install...

CJS F-1

I installed a catch can on my 2014 5.0 and my buddy has one on his 3.5 Eco.. No change in mpg for us.

Daniejw

Check your rubber lines. If they collapse. It'll cause a blockage...
Upgrade to braided lines.

Wicked46

It's a UPR Mega-can with all braided lines. It's brand new also.

scott.0691

Does it have check valves in the lines? Make sure the arrows point towards the engine...if not you will not vent and cause a drop in MPG...the instructions do not say this and can be misleading.....I have a UPR Dual valve catch can with the CSS...

Wicked46

Yeah, I made sure of that. They're definitely hooked up correctly

Dautz

Try unplugging the battery (10 Minutes) and letting the computer re-map the new dynamic of air flow. You cleaning the map sensors may have caused the engine to over adjust for A/f Mixture.

beaker80

You installed the check valves in the correct direction but are they working properly? Remove them and blow against the direction of the arrows. Are they closed? Try the other side and suck on them. Do they open? Verify all hose routings.