Compression Ignition Addict
Join Date: Mar 2011
Location: Reno NV
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Improving power and mileage
I have an E99 350 SD with a 7.3L. I'm getting really crappy mileage, with or without a load. Lately the truck is getting a little slower to start when it's cold, but always starts after the "Wait to start" light goes out. It's also begun to kick out a lot of black smoke when the engine is loaded or going up a hill. I can switch chip positions to make the black smoke somewhat better, but the EGT's can get upwards of 1700°, (briefly).
I don't get much boost either, about 8 PSI tops, 1-3 PSI while cruising. I am getting a trouble code that says I'm getting a boost over/under pressure.
I need to get this under control before I go broke. Fuel mileage has gone from a best of 14.5 to 8.2 now, so I know something's wrong. (I do have a fuel bowl leak so that doesn't help I'm sure.) I ordered a fuel bowl rebuild kit from Diesel O-Rings, (Thank you Bob for your help).
I don't have any boot leaks that I can see, and the boots are all upgraded, new last year. No visible signs of a leak anywhere in the system.
The motor only has about 40k miles on it, but the turbo could have about 225,000. I haven't taken it off to look at it to see what condition it's in. As far as I know, it's the stock turbo that's typical on an E99.
So what should I check? What should I replace? What should I modify? EBPV Delete? Turbo-Master wastegate actuator upgrade?
The way I see it right now, no matter what it costs, I'm still money ahead if I can get the fuel mileage back up to the 15-18 that it's supposed to be. We're still at $4.30 a gallon for diesel. I didn't even see an improvement when I switched to G-Diesel.
Desperate in Reno
Be gentle, it's my first PowerStroke.
E99 SD 7.3L CC DRW 4×4
PHP Phoenix 6 Position Chip
aFe Stage II Intake
Edge Insight CTS
Edge EAS EGT Probe
BD Exhaust Brake
Pierce 2T Dump Bed
PacBrake Air Bags (Rear)
Viair Onboard Air Compressor
Escort 9500ix Radar Detector (Worth it's weight in gold)
Cobra 29LX CB.
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