Fuel trim problem?
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Fuel trim problem?
Started new thread continued from:
https://www.ford-trucks.com/forums/1...then-dies.html
OK heres is where I'm at now with 600 miles on engine, @ idle the STFT and LTFT stay arount 0 +/- 3 but at highway speeds 2.5k rpm @ 60 mph STFT is around 0 +/- 5% but LTFT is around 10 +/- 5%, engine sounds ok power is there have new 02 sensors installed also noticed MPG (16.5) is down from original engine about 3 MPG less . No codes.
Thanks
Ed
2005 Ranger 4.0
https://www.ford-trucks.com/forums/1...then-dies.html
OK heres is where I'm at now with 600 miles on engine, @ idle the STFT and LTFT stay arount 0 +/- 3 but at highway speeds 2.5k rpm @ 60 mph STFT is around 0 +/- 5% but LTFT is around 10 +/- 5%, engine sounds ok power is there have new 02 sensors installed also noticed MPG (16.5) is down from original engine about 3 MPG less . No codes.
Thanks
Ed
2005 Ranger 4.0
Last edited by mred3; Jul 12, 2016 at 08:12 PM. Reason: update
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From: SW Va
Have a read here http://www.aa1car.com/library/fuel_trim_wellsmfg.pdf about fuel trim & if you don't have any set or pending trouble codes, at the articles end is a suspect list. Let us know what you find.
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Thanks for the article, I also noticed the engine load is high at idle its 20% plus at highway speeds its around 60 -70% give it a little gas and it burries to almost 100% quickly thought that strange.
Ed
Ed
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From: SW Va
I can't open the file for some reason, but if you've spotted, or suspect something isn't right, hook up your Analog multimeter on the 1K ohms scale & measure the TPS resistance across the full range of travel, while looking for any drop outs, or unsteady regions. Resistance changes should be smooth.
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