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Certified Ford Tech Help Forum Got a mechanical problem or question about your Ford Truck? Post it here for answers.

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Old 03-06-2017, 02:12 PM
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Fuel Trim opinions, paging Vince and others

Vehicle desc is in the signature (and vehicle uses MAF) and presents no drivability, fuel consumption, performance or any other concerns. I got curious awhile back and pulled fuel trims and voltages on the upstream O2 sensors; the results are below. This data was taken on a fully warmed up engine, vehicle parked and revved to ~2,000RPM. However, the results are usually the same at idle and at cruise, 65MPH and ~2,300 RPM. I say usually because, there was one event at idle where the LTFT's hovered around +3%, and why that one time I cannot explain.

Here's my concern/thoughts/opinions....LTFT's should be close to (ideally) zero, despite vehicle aging, and as seen are adding fuel. It is also noted that whatever be the cause is affecting both banks equally, and to the point that if there is a variance between them, it's not readily seen. Varying engine speed doesn't affect LTFT's, thus and IMO lessening the likelyhood of a VAC leak (including EGR valve not fully seating). MAF sensor was cleaned maybe three years ago and has ~28K miles since then. I have NOT checked fuel pressure; I do make it a point to always run top tier fuel. Fuel filter (thinking volume here) is new, yet not near replacement time (and vehicle doesn't starve for fuel when floored and held on a highway, it revs freely ~5,500RPM then hits the next gear). Whatever it is equally affects both banks, thus ruling out some things. On the flipside, it's approaching the "off by 10% flag" too (but I don't have a LTFT history over the years either), and this bugs me.

Your thoughts? I ask because, it's half apart now and although I have my doubts I could replace the intake gasket. I just have my doubts that this will change anything.

Edit: FWIW I do have FORScan, thus giving me the ability to pull the extended PID's.




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-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

04 Ranger Fx4 Level II, 5R55E, Sonic Blue Pearl, loaded.


Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp

Last edited by CowboyBilly9Mile; 03-06-2017 at 02:31 PM.
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Old 03-08-2017, 01:35 PM
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just remember short fuel trim is the adjusting that the pcm is making immediately. long fuel trim is when the pcm can't make sufficient adjustments with short trims.the easiest demonstration of that is watch the long trims when you create a large vacuum leak.
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Old 03-10-2017, 10:35 AM
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Will work with that, thanks Vince!
__________________
-Bill

-Life is far too short to be serious all the time. So if you can't stop and laugh at yourself along the way, give me a call and I'll do it for you.

04 Ranger Fx4 Level II, 5R55E, Sonic Blue Pearl, loaded.


Useful Ford Vehicle Resources:

Owners Manuals >>> http://www.fleet.ford.com/partsandse...owner-manuals/
Build Information (click on "vehicle") >>> https://www.etis.ford.com/
Wiring schematics and TSB's (click on "technical information") >>> http://bbbind.com/
Repair guides, includes schematics w/connector pinouts >>> http://www.autozone.com/repairinfo/r...nfoLanding.jsp
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