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Open Roads Forum  >  Class C Motorhomes  >  Class C

 > Ford V10 gradual reduction in fuel economy

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whemme

Spencer, IA

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Posted: 08/04/19 06:51pm Link  |  Quote  |  Print  |  Notify Moderator

I have a 26' Class C on a 2000 Ford E450 chassis with V10 engine now with 115,000 mile on it. I used to average 8.5 mpg pulling a 3400 lb toad but over time the economy has deteriated to the 7.5 to 8.0 mpg range. My Ford dealer says that as long as I am not getting any check engine codes that my oxygen sensors are still OK and not causing the reduced mpg problem. But I still wonder if the oxygen sensors might be causing the problem. Anyone else with experience with this issue?


2002 Born Free 26' RSB Motorcoach
2005 Chevrolet Malibu LS Toad

PartyOf Five

Wheaton, IL

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Posted: 08/04/19 07:47pm Link  |  Quote  |  Print  |  Notify Moderator

We add a couple cans of seafoam periodically to clean the inserts but I'll be curious what you learn also.


Da Moose - 2001 Dutchman 31' on E450

whemme

Spencer, IA

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Posted: 08/04/19 08:08pm Link  |  Quote  |  Print  |  Notify Moderator

PartyOf Five wrote:

We add a couple cans of seafoam periodically to clean the inserts but I'll be curious what you learn also.

Not sure what you mean by inserts. Do you mean injectors?

ron.dittmer

North-East Illinois

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Posted: 08/04/19 08:21pm Link  |  Quote  |  Print  |  Notify Moderator

Hi whemme,

Check for this.......It is possible someone who worked on your rig made this easy mistake, causing poor fuel economy and poor performance. It is easy to check for.

Pop-off the oval air intake from above the radiator and pivot it upward. Look into the hole where it was snapped into. If you see a black plastic flap that interferes with the flow of air, you need to remove the black plastic shroud above the radiator and fold the flap back while resetting it into position.

There was a recall in 2010 on that flap. Apparently a new-bee line worker was not holding the flap back when installing the black plastic top radiator shroud. It is conceivable that an unsuspecting mechanic could make the same mistake. I almost made that mistake myself on our 2007 E350 when reinstalling the top shroud after removing a bird that died hitting and getting lodged into our front grille area.


2007 Phoenix Cruiser model 2350, with 2006 Jeep Liberty in-tow


DrewE

Vermont

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Posted: 08/04/19 09:36pm Link  |  Quote  |  Print  |  Notify Moderator

Have the spark plugs been replaced? If not, they're probably at (or beyond) the end of their useful life.

Oxygen sensors do age, and are relatively inexpensive and easy to replace. If they're only somewhat out of calibration they may not cause check engine lights but still affect mileage some (and possibly catalytic converter life), or so I've been led to believe. Replacing them might be a reasonable thing to try. For that matter, if the catalytic converters are getting plugged from soot or whatever, that can affect engine performance as well.





whemme

Spencer, IA

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Posted: 08/05/19 09:15am Link  |  Quote  |  Print  |  Notify Moderator

New spark plugs and all new coil overs were installed at 100,000 miles but that did not help the mileage problem.

T18skyguy

Eugene, OR

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Posted: 08/05/19 09:41am Link  |  Quote  |  Print  |  Notify Moderator

Try cleaning the MAF sensor. Easy to do, just buy the correct spray from the auto parts store. It's easy to check the O2 sensors, they should read out a certain ohm reading on your multimeter. Youtube has a video on it I'm sure.


Retired Anesthetist. LTP. Pilot with mechanic/inspection ratings. 2017 Jayco Greyhawk 31FS. Wife and daughter. Three cats which we must obey.

Rick Jay

Greater Springfield area, MA

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Posted: 08/05/19 11:22am Link  |  Quote  |  Print  |  Notify Moderator

whemme,

Ok, I'll probably take some flak for this, but over the years, have you been using less "real gas" (no alcohol) and more of the E10? On all of our vehicles, the miles per gallon drops just about 10% on the E10 gas we get all over the east coast.

When we first got our motorhome, our gas stations had real gas and that's what I uased. When the E10 was mandated and I had to use that, I noticed our mpg dropped from the ranges of 8-9 mpg with real gas (depending upon whether we were towing or not) down to 7-8 mpg when we used the ethanol stuff.

I wasn't sure what had happened, but about 5 years ago when we were travelling south, I apparently filled up at a station which had real gas. Once back on the road, I immediately noticed on my dash computer the average mpg numbers began climbing to almost a full 1 mpg more! Terrain had been the same, so it wasn't a "you're going downhill" reason. The next fill up was with E10 and down came the numbers.

You've got A LOT more miles on your rig than ours (about 40,000), so it is certainly possible you're having issues due to aging components.

Just a thought.

Good Luck,

~Rick

* This post was edited 08/05/19 11:35am by Rick Jay *


2005 Georgie Boy Cruise Master 3625 DS on a Workhorse W-22
Rick, Gail, 1 girl (22-Angel, Lexi96.org), 1 girl (17), 2 boys (19 & 16).
2001 Honda Odyssey, Demco Aluminator tow bar & tow plate, SMI Silent Partner brake controller.


carringb

Corvallis, OR

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Posted: 08/05/19 03:31pm Link  |  Quote  |  Print  |  Notify Moderator

whemme wrote:

New spark plugs and all new coil overs were installed at 100,000 miles but that did not help the mileage problem.


Have you verified they were actually done?


Bryan

2000 Ford E450 V10 VAN! 450,000+ miles
2014 ORV really big trailer
2015 Ford Focus ST


time2roll

Southern California

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Posted: 08/05/19 03:36pm Link  |  Quote  |  Print  |  Notify Moderator

My plugs on my 5.4 were changed at 120,000 with no change to economy, smoothness of running or power. It ran exactly the same. And yes I know the dealer actually changed them.

I also would lean on more E10 and possibly some loss of compression.


2001 F150 SuperCrew
2006 Keystone Springdale 249FWBHLS
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