Worsening Fuel Economy
#1
Worsening Fuel Economy
2000 F250 V10. 149.5k miles. Fresh plugs at about 110k. I used Motorcraft plugs.
So my fuel economy has dropped to under 9 mpg from about 12.5 combined and 9 towing. I have seen this gradually with a dramatic drop in the last year. I used a scan tool and no codes came up. It starts and runs fine. I towed with it last week and it worked out fine. I run a K&N intake kit with Gibson cat back system and have since it was pretty new.
I am leaving on a short trip next week and want to try to avoid 6.2 MPG I got on my last towing trip, about 240 mi.
Without any obvious signs or symptoms showing, what would you guys here recommend looking at to try and get some of my mpg back?
Thanks,
Steve
So my fuel economy has dropped to under 9 mpg from about 12.5 combined and 9 towing. I have seen this gradually with a dramatic drop in the last year. I used a scan tool and no codes came up. It starts and runs fine. I towed with it last week and it worked out fine. I run a K&N intake kit with Gibson cat back system and have since it was pretty new.
I am leaving on a short trip next week and want to try to avoid 6.2 MPG I got on my last towing trip, about 240 mi.
Without any obvious signs or symptoms showing, what would you guys here recommend looking at to try and get some of my mpg back?
Thanks,
Steve
#4
#6
I agree, those K&N filters pass as much dirt as they do air (combined with the oil you spray on them), partly fouling the MAF sensor. I'd check for vacuum leaks, PCV valve and clean the MAF sensor with some of the CRC spray specially designed for MAP and MAF sensors, before you throw parts at this issue. K&N air filters cause more problems than they ever solve.
#7
I agree, those K&N filters pass as much dirt as they do air (combined with the oil you spray on them), partly fouling the MAF sensor. I'd check for vacuum leaks, PCV valve and clean the MAF sensor with some of the CRC spray specially designed for MAP and MAF sensors, before you throw parts at this issue. K&N air filters cause more problems than they ever solve.
I did clean the MAF. No filter oil on it. I have been cleaning and oiling foam filters since 1972.
I will change the fuel filter just because.
I will check the brakes but I think they're OK, no pull or anything like that.
PCV is loose and rattling good. Aside from that,whats to check? I will replace the PCV elbow though mine seems OK. I will check a couple plugs too.
I have heard that alcohol in gas affects economy and the requirements in California are always changing.
I did see the other threads where people are going through he same thing I am but don't see any common problems or fixes.
Thanks all.
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#8
Well, I haven't had any problems with my truck. $300 in shop fees, the rest I do myself and that's all maintenance.
I did clean the MAF. No filter oil on it. I have been cleaning and oiling foam filters since 1972.
I will change the fuel filter just because.
I will check the brakes but I think they're OK, no pull or anything like that.
PCV is loose and rattling good. Aside from that,whats to check? I will replace the PCV elbow though mine seems OK. I will check a couple plugs too.
I have heard that alcohol in gas affects economy and the requirements in California are always changing.
I did see the other threads where people are going through he same thing I am but don't see any common problems or fixes.
Thanks all.
I did clean the MAF. No filter oil on it. I have been cleaning and oiling foam filters since 1972.
I will change the fuel filter just because.
I will check the brakes but I think they're OK, no pull or anything like that.
PCV is loose and rattling good. Aside from that,whats to check? I will replace the PCV elbow though mine seems OK. I will check a couple plugs too.
I have heard that alcohol in gas affects economy and the requirements in California are always changing.
I did see the other threads where people are going through he same thing I am but don't see any common problems or fixes.
Thanks all.
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