Fuel Economy, Hypermiling, EcoModding News and Forum - EcoModder.com - View Single Post - What could cause lower than expected MPG [mechanically]?

roosterk0031 · 08-31-2019, 09:46 AM

My XFE had a evap solenoid go bad that was causing the Fuel Trims to max out taking it from 40 mpg down to low 30's, (essential a big vacuum leak) but it would run bad too, rich miss fire at low loads. Replaced $300 worth of other parts till unplugging the electrical connection to it and it returned to nomal. Replaced it yesterday for $32 CEL for it being disconnect hasn't cleared yet waiting to see if it will go away on it's own.

Edit: My CEL cleared it's self today.

08-31-2019, 09:46 AM	#5 (permalink)
roosterk0031 Master EcoModder Join Date: Jan 2011 Location: na Posts: 1,025 Thanks: 277 Thanked 218 Times in 185 Posts	My XFE had a evap solenoid go bad that was causing the Fuel Trims to max out taking it from 40 mpg down to low 30's, (essential a big vacuum leak) but it would run bad too, rich miss fire at low loads. Replaced $300 worth of other parts till unplugging the electrical connection to it and it returned to nomal. Replaced it yesterday for $32 CEL for it being disconnect hasn't cleared yet waiting to see if it will go away on it's own. Edit: My CEL cleared it's self today. Last edited by roosterk0031; 09-03-2019 at 11:21 AM..