8.7mpg
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Joined: Nov 2003
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From: Utah County, UT
Originally Posted by foodog2
I was getting milage like that and my mechanic tightened up every hose clamp on the turbo and I got about 1 MPG per clamp. I also needed a map sensor. The mechanic did not just run the computer he actually was reading voltages and levels of a bunch of stuff.
Does the truck roll pretty easy when in Neutral? On flat to very slight decline, I can push mine myself at the door. Also, what about tires, inflated properly? Are they the right size? if not has the speedo been re-cal'd to show proper speeds? I use the mile markers on the interstate and get a 5 marker average, i.e. if on 3 at the post, look down again in about 4-5 minutes to see if the posts are still at 3. It would have to be quite a ways off to error calculations that much though.
Last edited by cangim; Mar 27, 2006 at 11:35 PM.
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Senior User
Joined: Feb 2006
Posts: 348
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From: Central, NY
Ya, I should really check tirepressure. I had new tires installed after tank #2. Hmm...
Truck will coast pretty far once I let off the gas. I don't think theres any real resistance there.
Map sensor eh? That might be tough to diagnose...
Truck will coast pretty far once I let off the gas. I don't think theres any real resistance there.
Map sensor eh? That might be tough to diagnose...
Fleet Owner
Joined: Jun 2004
Posts: 25,090
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From: Rio Rico, AZ.
Originally Posted by BowDown
Should I have a cat on my 2000 CC Dually SB? I dont remember seeing one.
Maybe the muffler is stopped up?
Maybe the muffler is stopped up?
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Joined: Feb 2006
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From: Central, NY
Originally Posted by wolftan
I would try an additive.....maybe bad gas too?
I put an additive every time. I just tried a new kind on the 4th fillup. No change. If anything worse.
Last edited by BowDown; Mar 28, 2006 at 10:48 AM.
Senior User
Joined: Feb 2006
Posts: 141
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what about that icp fuel sensor....not sure what happens when those things go out....you can buy those from ebay for about $40
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Of the next Riffraff East
Joined: Oct 2004
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From: Concord NC
What kind of RPMs are you showing at highway speeds? Say 60 and 70mph. Do you know what gears you have? I just went to 315s on my truck and my speedo is off around 10%. I would guess that my odometer is also off that much. That still wouldn't account for that much differance in you mileage. What about your front hubs? Are you sure their not locked?
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Senior User
Joined: Feb 2006
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From: Central, NY
4 rear tires were 55lbs... front passenger was 52lbs.. front driver was 42lbs!
Wow, hope I dont have a leak. New tires were mounted like 3 weeks ago at ford.
I filled all to 70lbs per mechanics suggestion.
Wow, hope I dont have a leak. New tires were mounted like 3 weeks ago at ford.
I filled all to 70lbs per mechanics suggestion.
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Joined: Nov 2003
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From: Utah County, UT
Depending on tire, I would stay at 55 if you are not loaded, you can check the hubs for sure by turning the front driveline by hand when not engaged. If on is engaged, it will be difficult to turn and you can see which one doesn't rotate with the drive line.
I am doing right at 70 @ 2000 rpm, haven't really driven 55 mph lately, I have 3:73 gearing. Your 2000 probably doesn't have a Cat, but the stock muffler really restricts the flow. Have you disconnected batteries to reset the PCM. Probably won't make any difference though.
I am doing right at 70 @ 2000 rpm, haven't really driven 55 mph lately, I have 3:73 gearing. Your 2000 probably doesn't have a Cat, but the stock muffler really restricts the flow. Have you disconnected batteries to reset the PCM. Probably won't make any difference though.
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From: Central, NY
I know the hubs are in AUTO mode. They were locked when I first got it, and I had to take the handle of a pair of channel locks to use as a key to turn em. I couldn't turn em with my hands.