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  1. elripster

    Under 8 MPG

    That's a good point. I think I saw a reference to a 275, that might have been for the 15" wheel. Can't recall, too many years, too many beers. I apologize, I know we are getting off topic. Just maybe killing time until we hear what the shop has to say. Frank
  2. elripster

    Under 8 MPG

    I meant 4.56's and 35's resolve to the correct speed reading on the dash. Was typing too fast, didn't proofread. Yes 4.11 is the stock ratio for sure.
  3. elripster

    Under 8 MPG

    It was probably a 275/70 R16 which has a static diameter slightly over 31" so a 31X10.5 would have the speedo pretty much spot on. Frank
  4. elripster

    Under 8 MPG

    That makes sense. To get back to MPG's, bigger more aggressive tires definitely increase road load (more rolling resistance, wind resistance, mass, and inertia) but not to the tune of 8MPG. I could get 16 when my truck was stock and I gave up 2-3MPG most of that being tires but the roof rack...
  5. elripster

    Under 8 MPG

    I believe 4.56's and stock put you about spot on. 4.88's and 37's get you close but 35's should leave you undergeared. Frank
  6. elripster

    Under 8 MPG

    So, I like many have 4.88's and 35's. I find I am about 9% undergeared with some wear on my tires. Soooooo yeah, I go less far than indicated so MPG's are actually worse but no where near 8MPG. If I am easy on it I can still get 14 on the highway. I am rarely easy on it though. Frank
  7. elripster

    Under 8 MPG

    Makes sense. I usually fix my own stuff but kid #4 came along when my engine needed rebuilding and I punted. Owning old trucks seems to present us with two paths, we learn the trucks and trade our time for money, or we pay someone else and do the same in the other direction. If this shop...
  8. elripster

    Under 8 MPG

    Yes, a few possibilities actually. It would be very helpful if you noted the Vf1 and Vf2 voltages. It's a starting point as to what the controller is trying to do. You will need good O2 sensors for those readings to mean anything though. I really think you should check out that link I...
  9. elripster

    Under 8 MPG

    Sounds like a plan, let us know what you find. Frank
  10. elripster

    Under 8 MPG

    Can you see what the O2 voltages are, are they fluctuating? Also, can you see the Vf voltages? We really need a lot more information to solve this. There are a lot of potential causes. Keep in mind a rich engine leads to cool exhaust which means cool O2 sensors which will fail to fluctuate...
  11. elripster

    Under 8 MPG

    I meant unplug the O2's not remove them entirely. It forces the engine to run open loop and can help to point to different sensors as being an issue or not. What does the scan gauge report for those values? Frank
  12. elripster

    Under 8 MPG

    My trip odo doesn't work either. Key question then, was the drive between points where the distance aligns with the odo? Frank
  13. elripster

    Under 8 MPG

    So did you unplug the O2's and drive? Just want to make sure we understand the test. If you did we then need to look at the remaining sensors and see why the base injection duration is too long allowing for too much fuel (assuming you are sure you don't have a leak somewhere...). Let's get...
  14. elripster

    Under 8 MPG

    I have that RPM issue from time to time. You might try this. Unplug the O2 sensors and repeat the drive. See if the MPG's change. Also, do you have an OBDII scanner? You can get them on Amazon and use an app like Torque on your phone to read the O2 values realtime. It can be indispensable...
  15. elripster

    Cooper ST Maxx Tires Uneven Wear

    Is it the same on all 4 wheels? In that one picture it looks like you might want to run a slightly higher pressure. Typically balance, worn parts, or a bent rim would cause that cupping / scalloping, however, low pressure can cause the tread to squirm under load and also cause wear on the...
  16. elripster

    Fuel Pump Relay Pinout

    I couldn't agree more. I have this on my google drive set to access offline so it synchs to my phone, tablet, computer... etc.... It's the only way especially if you need it when out of cell range. Frank
  17. elripster

    Fuel Pump Relay Pinout

    I'd second getting the manuals. This is for OBD1, not sure what year your truck is.....
  18. elripster

    Fuel Pump Relay Pinout

    Did you check for continuity at the AFM? The flapper door has to move to enable power to the fuel pump (lower left...)
  19. elripster

    Fuel Pump Relay Pinout

    I'll check my schematics. You should have voltage on 2 of the plug side pins and ground. Frank
  20. elripster

    Failing SMOG, Bizarre VF1/2 and OX1/2 readings

    Kinda have to. Losing Rathtar would be like losing a family pet to the kids. It must get fixed.
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