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  1. Indiana80

    Fuel Trim

    Yep, cleaned old MAF w/ no change. Tried a new OEM MAF and no change. Today, she’s idling around 8% LTFT and about the same / maybe a little higher on the higway. She’s happy today.
  2. Indiana80

    Fuel Trim

    Gotcha. Thank you. Would you keep digging to try to figure out why LTFT is always around +10 or call it good?
  3. Indiana80

    Fuel Trim

    Thanks, Landtank. So you see +10% LTFT as normal on these trucks with 33” tires and heavy aftermarket bumpers?
  4. Indiana80

    Fuel Trim

    In partsouq diagram lookup looks like it’s called a fuel vent hose, which makes sense to me since it runs to charcoal canister. Wondering if this old vent hose could cause a fuel starvation problem or a vac leak?
  5. Indiana80

    Fuel Trim

    I did find what looks like a thicker vacuum line under the upper intake that looks original and crusty. Pretty disappointed b/c I paid a mechanic to pull intake about a year ago and he agreed to replace all the vacuum lines while under there. I’ll post a pic of the vac line- it runs off the...
  6. Indiana80

    Fuel Trim

    Not sure. It’s been like this quite awhile.
  7. Indiana80

    Fuel Trim

    Thanks. Also, I know ethanol blended fuel (which I use) plays a part in the LTFT. Maybe also the 33” tires I’m running?
  8. Indiana80

    Fuel Trim

    Maybe…I had an OTRAMM exhaust system installed by a local independent shop about a year ago. They struggled with it. They installed a new Magnaflow y-pipe then installed the OTRAMM cat back system. It was hitting the frame in several spots. Long story short, I pulled the OTRAMM system off and...
  9. Indiana80

    Fuel Trim

    Fuel trim question: I’ve got a 97 1FZFE. Set my Ultra Gauge to monitor fuel trims. Long term fuel trim is ALWAYS +8 to +11%. Short term fuel trim is always +/-5%, and typically less than +/-3%. If I had a vacuum issue, I’d suspect the LTFT would drop significantly when I hit the gas pedal...
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