02excursion73
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• Herndon, VA, USA |
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• Registered on 1/8/2007 |
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• 46 posts |
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 Posted:2/6/2007 19:13 |
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I am having a fuel mileage problem. My rig is a 2002 Excursion 4*4 with a 7.3PSD. I have 87700 miles on it. I have only owned this truck for only four months. During the first two months of ownership and before any mods I was getting 17-18 on the highway and 13-14 in the city.
I have performed the following to the truck:
Mods:
Pirrelli Scorpion ATR 285 tires
Oil crossover line mod.
New "Improved" blue International Harvester Cam Position Sensor.
Motorcraft Air Intake System
Repairs:
New Pinion bearings
Trans & Power Steering flush
Alignment
I know it is winter and MPG can go down but recently I am getting 11-12 in the city and a flat 14 on the highway. The engine never seems to warm up completely (always very loud) never seems to quiet down like it does in the warmer weather. The temp in my area is currently 10-30 degrees.
Could I have a thermostat problem? I know these motors run rich during warm up.
Could the new "Improved" CPS be the problem? -causing the the computer to read a false advanced position on the Cam.
The power has gone up since before the mods. The engine starts up quickly and seams to run ok. I have noticed a slight hissing noise at part throttle which sounds like a vacuum leak under the dash. Could this be a leak near the turbo?
Anyone have any ideas? Thanks for all the great info I have found on this site!!
2002 Excursion 4*4 Limited, Motorcraft AIS, Oil Crossover Tube, Zoodad Mod, Pirelli ATR 285's, Magnaflow 4" exhaust with 3.5" downpipe and twin mufflers,
V codes with mini spring packs, Modified F codes, Rancho steering stabilizer, Edelbrock shocks, 05 X rear anti sway bar, V10 Trans cooler, Diesel Site 203 Thermostat. |
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E. Long
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• Subscriber since 1/1/2001 |
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• Atlanta, GA, USA |
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• Registered on 1/23/2001 |
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• 2,186 posts |
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Posted:2/6/2007 19:23 |
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Your winter mileage woes are par for the course. Here's why:
- The hissing/whooshing sound is actually by design. This is the exhaust backpressure valve doing its job to make the engine warm up faster. If your daily commute never has your engine getting up to operating temp, then you'll always hear this. It's been rather chilly here in NC the past couple weeks and my 7-mile commute to the office is not enough to get to full operating temp during these colder days. Under a certain amount of load the valve will open up completely and you won't hear the whooshing sound. For me, it's about 2/3rds throttle off the line. It'll eventually disengage when the engine is at full operating temp.
- In your neck of the woods, they may be running a blended diesel for the winter months. I know this was true for when I lived in Minnesota. Fuel companies add an anti-gel agent to the diesel fuel and this blended formula will always drop your mileage. Diesel #2 is non-blended and what you'd run in the summer time. At the "big rig" truck stops you'll see a variety of blended diesels (#2, #2+1, and #1). Depending on how much diesel is in the tank and if you're running just Diesel #2 and the temp drops below freezing for an extended period, you run the risk of your fuel gelling. Just a natural property of diesel fuel.
Your mileage ratings are very much where I ran at during the winter months. I don't do nearly the amount of driving I did while in MN, so I'm lucky to fill up once a month nowadays. I put on 170,000+ miles while in MN and each winter, the MPG would drop significantly. Just the nature of the beast!
-Eric
'67 Galaxie 500 - 390 FE, .030" over, FE to AOD adapter, disc brake conversion. The Daily Driver.
'00 Excursion - 7.3L PSD, LANDYOT Gen-II Radius Rods, Factory Tech Valve Body, 200K+ miles and going |
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Jim_L
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• Northern Virginia, VA, USA |
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• Registered on 4/2/2003 |
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• 15 posts |
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Posted:2/6/2007 21:45 |
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Eric is right about the mileage dropping during the winter. Suppliers blend to try and alleviate the gelling problem during the winter. Still should be adding the anti-gel additive to your tank though. It;s been right chilly around NOVA the last couple days. Aside from the seasonal factor, I've also noticed a decrease in my mileage since the new Ultra Low Sulfur fuel hit the pumps back in October. Used to do a solid 15-16 around town, and 19+ on the highway. Now I'm seeing 14 around town, and not much more on the highway. Mine is a stock 2001 Limited 4x4 with the 7.3 PSD and 100k miles.
- Jim L
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02excursion73
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• Herndon, VA, USA |
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• Registered on 1/8/2007 |
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• 46 posts |
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Posted:2/7/2007 17:19 |
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Thanks Eric & Jim for the reply. It is very helpful to hear from experienced PSD owners.
The last Ford diesel I owned was a 1994 7.3 without a turbo - very simple engine.
I may go ahead and install the 203 degree thermostat from Dieselsite which I hope will help a bit.
Does anyone cover up the grills of their trucks to limit airflow to the radiator like I see on the big rigs in the winter?
2002 Excursion 4*4 Limited, Motorcraft AIS, Oil Crossover Tube, Zoodad Mod, Pirelli ATR 285's, Magnaflow 4" exhaust with 3.5" downpipe and twin mufflers,
V codes with mini spring packs, Modified F codes, Rancho steering stabilizer, Edelbrock shocks, 05 X rear anti sway bar, V10 Trans cooler, Diesel Site 203 Thermostat. |
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E. Long
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• Subscriber since 1/1/2001 |
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• Atlanta, GA, USA |
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• Registered on 1/23/2001 |
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• 2,186 posts |
• 1
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Posted:2/7/2007 22:41 |
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| Quote: | Thanks Eric & Jim for the reply. It is very helpful to hear from experienced PSD owners.
The last Ford diesel I owned was a 1994 7.3 without a turbo - very simple engine.
I may go ahead and install the 203 degree thermostat from Dieselsite which I hope will help a bit.
Does anyone cover up the grills of their trucks to limit airflow to the radiator like I see on the big rigs in the winter? |
You may consider it if you're not getting up to operating temps quickly enough for your commute. I never did, but then again, I had a 70-mile round trip each day, so there was ample time to get to operating temp. I would never plug mine in either, unless it was going to sit outside for a couple days. My X always did quite well in the cold. Those days where the temp was well below zero were interesting. 
-Eric
'67 Galaxie 500 - 390 FE, .030" over, FE to AOD adapter, disc brake conversion. The Daily Driver.
'00 Excursion - 7.3L PSD, LANDYOT Gen-II Radius Rods, Factory Tech Valve Body, 200K+ miles and going |
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ronbus1
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• Ft. Wayne, IN, USA |
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• Registered on 7/23/2006 |
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• 3 posts |
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Posted:2/11/2007 08:44 |
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I found a winter front for my EX In JC Whitney catalog,good investment . The EX heats up in half the time. |
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Pharmer
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• Mackinaw City, MI, USA |
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• Registered on 12/19/2002 |
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• 52 posts |
• 2
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Posted:2/11/2007 12:38 |
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My guess is the wrong CPS plus the cold. From reading info on the blue CPS the results are mixed. This year my cold weather mileage is better, no less than 15 in town and up to 18 + on highway. It may be more broken in. Fully stock, only use powerservice at fillups. The cold front is a good idea. |
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02excursion73
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• Herndon, VA, USA |
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• Registered on 1/8/2007 |
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• 46 posts |
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Posted:2/11/2007 20:48 |
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Thanks gentlemen. I will buy a front grill cover and go back to the stock Ford CPS and let you know of the results.
2002 Excursion 4*4 Limited, Motorcraft AIS, Oil Crossover Tube, Zoodad Mod, Pirelli ATR 285's, Magnaflow 4" exhaust with 3.5" downpipe and twin mufflers,
V codes with mini spring packs, Modified F codes, Rancho steering stabilizer, Edelbrock shocks, 05 X rear anti sway bar, V10 Trans cooler, Diesel Site 203 Thermostat. |
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shiepo
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• carson, CA, USA |
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• Registered on 6/23/2011 |
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• 75 posts |
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Posted:7/28/2011 21:24 |
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hi guys is there anyone know where to buy a grill? |
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summerscheifer
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• Carson, CA, USA |
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• Registered on 11/26/2010 |
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• 50 posts |
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Posted:7/28/2011 21:27 |
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| Quote: | Thanks Eric & Jim for the reply. It is very helpful to hear from experienced PSD owners.
The last Ford diesel I owned was a 1994 7.3 without a turbo - very simple engine.
I may go ahead and install the 203 degree thermostat from Dieselsite which I hope will help a bit.
Does anyone cover up the grills for trucks to limit airflow to the radiator like I see on the big rigs in the winter? |
yeah ive been usually done that. i always cover the grill to limit the airflow to the radiator.
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