Fuel Trims - light at the end of the tunnel
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Senior Member
Joined: Dec 2016
Posts: 401
Likes: 69
From: Tubac AZ
Fuel Trims - light at the end of the tunnel
at idle (730 rpm) :
Bank 1 stft -13.3 ltft +16.4
Bank 2 stft -14.2 ltft +14.1
at 2500 rpm:
Bank 1 stft -3.1 ltft -9.4
Bank 2 stft -1.6 ltft -8.6
Idle long terms are down from +19.5 on both banks, which of course logged the lean codes for both banks. They have dropped 1 to 2 % after each short run at 35 to 40 mph that I've been able to drive. MIL and CEL have not reappeared (fingers crossed). Once I get my new front tires, (steel actually showing on inside tread on both sides, did a garage realignment with two squares attached to a piece of angle iron) I'll take it out for a real drive cycle run. What, if any, response do you guys have for me regarding the fuel trims?
Bank 1 stft -13.3 ltft +16.4
Bank 2 stft -14.2 ltft +14.1
at 2500 rpm:
Bank 1 stft -3.1 ltft -9.4
Bank 2 stft -1.6 ltft -8.6
Idle long terms are down from +19.5 on both banks, which of course logged the lean codes for both banks. They have dropped 1 to 2 % after each short run at 35 to 40 mph that I've been able to drive. MIL and CEL have not reappeared (fingers crossed). Once I get my new front tires, (steel actually showing on inside tread on both sides, did a garage realignment with two squares attached to a piece of angle iron) I'll take it out for a real drive cycle run. What, if any, response do you guys have for me regarding the fuel trims?
Veteran Member
Joined: May 2009
Posts: 27,518
Likes: 4,910
From: Yorkshire, England
They should not be like those unless they were bad and you've fixed something relevant - have you / what?
You could zero them and cause a relearn from zero by disconnecting the battery (warning: it also unsets all the OBD monitors).
If (that's IF) all is OK it'll speed things up but if not it may be stuck with unset OBD monitors (smog fail in many places) and unable to flag codes to help.
If you leave as-is, relearning should continue (if fixed) so you'd need patience instead.
You could zero them and cause a relearn from zero by disconnecting the battery (warning: it also unsets all the OBD monitors).
If (that's IF) all is OK it'll speed things up but if not it may be stuck with unset OBD monitors (smog fail in many places) and unable to flag codes to help.
If you leave as-is, relearning should continue (if fixed) so you'd need patience instead.