94 idi mileage: HELP!! - Ford Powerstroke Diesel Forum
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post #1 of 13 Old 08-27-2007, 07:19 AM Thread Starter
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Post 94 idi mileage: HELP!!

Gentlemen, why would a '94 turbo 7.3 with reconditioned inj.'s and 180K get 8 to 9 mpg empty, when my 84 6.9 with 289K got about 11 towing a 16 foot enclosed trailer. One garage says its about all I can expect, another wants to do a compression check. I had the timing checked and he says he turned it way up. One guy on this page claims 16 to 17 mpg. what's the deal???
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post #2 of 13 Old 08-27-2007, 08:01 AM
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Welcome!!

Bumping this back up for ya!! Someone should be along soon to help you out!

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post #3 of 13 Old 09-07-2007, 09:06 AM
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Does it smoke? Was the timing turned up to specs or just played with? Also, are the air and fuel filters in good shape?

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'97 F-350 "FORDOR" 4X4 (Dually Conversion, Shackle Reversal, Technicooler , Auto Meter Gauges, 4" DIY Dual Exhaust w/ '08 tips, 4" DIY intake w/ AEM filter, Wicked Wheel 2, 360 thrust bearing, Homemade E-fuel conversion, Wildman Chip, 160cc DIY injectors , DIY IDM mod) 230K and counting...
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post #4 of 13 Old 09-07-2007, 05:25 PM Thread Starter
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If you're thinking the pump has been turned up alot, I would doubt that. The guy I bought it from just didn't seem like a tinkerer- everything on it is stock. It has good power, but it only smokes a little when I get on it, which is a lot less than my '84 6.9. Seems to me the mechanic only played with the timing seeing as he only charged $60.00. I changed the air filter before bringing it in, but you can be sure I am changing the fuel filter this weekend. Thanks for the input!
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post #5 of 13 Old 09-07-2007, 05:41 PM
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my 94 PSD gets 20/22 on the open road, (me nad dog in it)15 towing !! I dont understand how the injectors woul do it but who am i Bill

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post #6 of 13 Old 09-08-2007, 04:38 AM
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With 180k miles, I would think the drivetrain is not as free rolling as it was new. I would go through and change the gear fluids and make sure I hit every grease point I could find. Also take a look at the wheel bearings, pick up each front wheel one at a time and spin the tire to see if you hear a slight grinding noise.

Is it 2wd or 4wd? How are the tires? Are they aligned good, does it track straight? Exhaust leak?

Many different things will cause bad gas mileage.
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post #7 of 13 Old 09-09-2007, 10:55 AM Thread Starter
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It's a 4x4, so I wasn't expecting miraculous mileage, and the rear tires have worn suspiciously worse than the front, though I've only owned the truck for two months. The prev. owner could have put the nice meats on the front. He used it for towing a fifth wheel which could explain rear tire wear, too. I am planning on changing the 33 x 12.5's on it now to 275 8.5 street radials. No exhaust leak either. Thanks for the tip on the drive train.
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post #8 of 13 Old 11-30-2007, 04:23 AM
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Quote:
Originally Posted by nopowerstroke94 View Post
It's a 4x4, so I wasn't expecting miraculous mileage, and the rear tires have worn suspiciously worse than the front, though I've only owned the truck for two months. The prev. owner could have put the nice meats on the front. He used it for towing a fifth wheel which could explain rear tire wear, too. I am planning on changing the 33 x 12.5's on it now to 275 8.5 street radials. No exhaust leak either. Thanks for the tip on the drive train.
Hey there have you ever figured out your milage problem? I just bought a '94 turbo with 288,000 miles and I am super impressed. It has good power and the one tank of fuel that I got to check the milage on was great, 15.8 with about 50 miles of heavy trailer pulling( my 40' flatbed with about 10,000 lbs. of pipe on it)! I was way surprised it got that good with that trailer pulling and the rest of it pretty much town driving with a whole lot of hot-rodding! Let me know what you ended up finding out, I would be interested in any info. I can read up on with these trucks. Thanks!

Fletcher
'90 F250 Supercab IDI 7.3
Banks Sidewinder Turbo
4'' straight pipe
116,000 miles

'94 F250 single cab IDI Factory Turbo 7.3
3'' banks down pipe
Banks pyrometer
3 1/2'' straight pipe
K&N Air filter
Hypermax air intake
Hydrogen Generator
Pump turned up
Timing advanced
315,000 miles!



'89 F250 4x4 supercab 7.3 IDI
4'' exhaust
pump turned way up!!!
297,000 miles
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post #9 of 13 Old 11-30-2007, 04:33 AM
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injection timing plays a big part i fuel mileage on that engine

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post #10 of 13 Old 11-30-2007, 04:45 AM
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OK guy's: I have ne of these 94 powerstroks ,the thumbnail is up in hte left corner. I get 22 mpg on the I state with me an the dog.. I pull a 36' Montaniana 5th wheel i get anywhere from 13 to 15 mpg (which way is the wind blowing), I got 12 mpg while on I44 across the Ozarks. While driving around town (joliet ,IL) i get 15 mpg.. I have kept records and am sure of this.. The truck has 4' exh,K&N, So Bend con"O" Clutch, Edge evo, coolant filter, and the blue CPS from.International.... BILL>>>>>>>>

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