Air Intakes and MPG went somewhere, but not up

[mthayer]

I am looking at putting on a air intake (cold air box) on my 97, 7.3. I am kinda on a budget at this point, but I need to get better mileage. What type of box does this forum recommend using? I have used a K&N filter on another truck, but really didn't notice a difference on the mileage. Also my fuel mileage just went to hell and I cant figure out why. I was getting 16 on avg, but now I am getting about 12. Running the same brand fuel, from the same station, same pump (since they only have one pump). No problems with the truck, nothing changed but just the weather cooled down about 10 degrees. Any help or suggestions are appreciated.

[Raul@Stealth Automotive]

Originally Posted by mthayer

I am looking at putting on a air intake (cold air box) on my 97, 7.3. I am kinda on a budget at this point, but I need to get better mileage. What type of box does this forum recommend using? I have used a K&N filter on another truck, but really didn't notice a difference on the mileage. Also my fuel mileage just went to hell and I cant figure out why. I was getting 16 on avg, but now I am getting about 12. Running the same brand fuel, from the same station, same pump (since they only have one pump). No problems with the truck, nothing changed but just the weather cooled down about 10 degrees. Any help or suggestions are appreciated.

could it have been the switch from ULSD to LSD? everyone saw MPG decrease with the switch...

i would take off the K&N... if your on a budget do the DIY intake kit... if you want to spend a lil more do a S&B intake kit....

-Raul

[mthayer]

The drop in MPG happened just in the last month, so it cant be the switch from LSD to ULSD. I just cant figure out what happened to it. Kinda pisses me off since I was getting about 260 miles to 200 miles on my front tank of fuel. Also would it be worth while to go from a 4 inch exhaust to a 5 or 6 inch? The cons I can see would having to get a new muffler and catalytic converter. The local DOT officers can be real pricks about everything.

[95dieselsmoke]

checked your fuel filter lately?

[mthayer]

I change my fuel filter out every 3 months. I changed it out today, but the old one was not real dirty.

[mthayer]

I use NAPA Gold filters in every vehicle and every piece of equipment we own. I have never had a problem with them. Never had one come apart on me like other brands. BTW I only run chevron fuel and oil in this truck and Schaffer's Diesel Treat and every once in a while the Lucas fuel treatment.

[NTEpsd]

i am fixing to buy a banks monster exhaust kit for my 97 psd. does any one know if it hooks to the factory cat or does it have a delete pipe? if it has a delete pipe how do you get it to pass emissions?

[Tyler]

Originally Posted by mthayer

The drop in MPG happened just in the last month, so it cant be the switch from LSD to ULSD. I just cant figure out what happened to it. Kinda pisses me off since I was getting about 260 miles to 200 miles on my front tank of fuel. Also would it be worth while to go from a 4 inch exhaust to a 5 or 6 inch? The cons I can see would having to get a new muffler and catalytic converter. The local DOT officers can be real pricks about everything.

You have not Cat. cuold just be cold weather causing the bad MPGS

[Raul@Stealth Automotive]

Originally Posted by NTEpsd

i am fixing to buy a banks monster exhaust kit for my 97 psd. does any one know if it hooks to the factory cat or does it have a delete pipe? if it has a delete pipe how do you get it to pass emissions?

why buy a banks exhaust? they are overpriced IMO... you can get the same quality for less....

and most OBS exhaust kits do not have space for a factory cat....

-Raul

[SuperDuty73]

Originally Posted by NTEpsd

i am fixing to buy a banks monster exhaust kit for my 97 psd. does any one know if it hooks to the factory cat or does it have a delete pipe? if it has a delete pipe how do you get it to pass emissions?

Start your own thread.