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Quoted From dreamer2355:
The job of the LTFT is to keep the STFT to as close to zero as possible.
Your STFT numbers will be varying during vehicle operation. However, if you have negative LTFT numbers, that usually means the vehicle is taking away fuel due to a rich condition. If the numbers are positive, the vehicle is adding fuel to compensate for a lean condition.
is there a easy fix for that like cleaning the injectors?
As long as your fuel trim numbers are +/- 10 of each other, you should be fine.
Here is a video by Scanner Danner that explains fuel trim –
http://www.youtube.com/watch?v=oRX2V6_a … re=g-all-c
Quoted From dreamer2355:
As long as your fuel trim numbers are +/- 10 of each other, you should be fine.
Here is a video by Scanner Danner that explains fuel trim –
http://www.youtube.com/watch?v=oRX2V6_a … re=g-all-c
i drove the truck to the store about 5 miles round trip and when i pulled on the gas pedal it has a hesitation and lass of power to go and sound sort a like a knocking sound and the truck starts to shimmy, shake if the rpm go higher then 1500.. could that be bad injectors? when can i do to fix the problem
With the addition of the ‘knocking sound’ you might want to be checking the timing, you may have a misfire or a timing issue.
i think your right i checked the timing to day and its 4 degrees off so im gonna reset it .. the repart book tells me to set it at 10 degrees BTDC
Quoted From F150guy82:
i think your right i checked the timing to day and its 4 degrees off so im gonna reset it .. the repart book tells me to set it at 10 degrees BTDC
Make sure that you disable the spark advance that the computer will try to compensate for when you adjust the timing.
Quoted From dreamer2355:
Make sure that you disable the spark advance that the computer will try to compensate for when you adjust the timing.
how do you disable the spark advance?.. and about where would i find it?
I did some quick research on this and apparently you can’t adjust the ignition timing on that vehicle all you can do is make sure everything is lined up mechanically.
i lined up everything just like the repair manual say to im just waiting for my new spark plugs and wires to to here from fedex
is this the spark advance i found one just like it by the ecm/pcm.. do i just unplug it and start the truck?
if i put out the SPOUT connector will it mess up the truck or no i dont know what it is or what it dose ?
That’s just used for diagnostic purposes and takes the PCM out of the picture when doing adjustments, it’s not recommended you run the engine without it connected.
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