fuel trim question

1iwilly · #1 08-31-2014, 12:01 PM

hello to all
when monitoring the fuel trims what are the good reading to look for.??still chasing a lean condition after a few more adjustments now at idle i see more + than - i was seen before LT-1 is down from 3.8 to 1.5 LT-2 is down from 3.8 to 2.5 as of today ST-1 is more in the 3.1 to 0.7 at idle compare to before -1.5 to -.07 ST-2 3.5 to -1.5 this is after changing 2 pre-cat 02 and bank-1 sensor 2 giving code po141 heater malfunction.next trip out i'll take pic of at ildle from start up then after warm and while cruising.thanks

upallnight · #2 08-31-2014, 05:59 PM

ideally the ST and FT should be as close to 0 (zero). But anything less than 3 should be fine. Anything over 10 +/- will set off the SES light. Do you have a SES and CEL light on right now?

1iwilly · #3 08-31-2014, 06:43 PM

yes it was reading p2096 bank-1 and p2098-bank-2 and p1093-bank 2 i've clear the codes but haven't drove it since then.

Quote:

Originally Posted by upallnight

ideally the ST and FT should be as close to 0 (zero). But anything less than 3 should be fine. Anything over 10 +/- will set off the SES light. Do you have a SES and CEL light on right now?

upallnight · #4 08-31-2014, 07:26 PM

When was the last time the fuel filter was changed? Filter might be clogged and that is why both banks are lean.

1iwilly · #5 08-31-2014, 08:47 PM

The filter was change 2 month ago fuel pressure with the key on only is 52 and running is 52 under load it is 46

QUOTE=upallnight;1006894]When was the last time the fuel filter was changed? Filter might be clogged and that is why both banks are lean.[/QUOTE]

1iwilly · #6 09-01-2014, 10:02 AM

ok light back on code p2096-bank1/2098-bank2 freeze frame reading still learning to read the fuel trim.
CALC LOAD%=35.2
COOLANT=208
ST FTRM1%=4.6
LT FTRM1%=1.5
ST FTRM2%=3.8
LT FTRM2%=3.1

upallnight · #7 09-01-2014, 12:28 PM

P2096 Post Catalyst Fuel Trim System Too Lean Bank 1

Did you also replace the 02 sensor after the converter?

1iwilly · #8 09-01-2014, 12:45 PM

yes all 4 02 were change after intensive search on fuel trims -means rich and +means lean. i found a trick to look for leaks but still working on it. because here in kissimmee fl dam heat index 100 to 103 each day. is hard to work out side,
with the truck running and the code reader set to fuel trim. while watching the readings spray carb or brake or starting fluid around disa valve while still looking at trim reading for big changes i found a small one around the disa valve took it out put some silicone around it waiting for it to dry to re test.all the seals are new when the intake was remove.but something simple sometimes can kick your ass .

Quote:

Originally Posted by upallnight

P2096 Post Catalyst Fuel Trim System Too Lean Bank 1

Did you also replace the 02 sensor after the converter?

1iwilly · #9 09-01-2014, 04:21 PM

well i finally found a simple home made smoke machine will test this week link=
MAKE YOUR OWN LEAK DETECTOR W/ A JAR, TIRE PUMP & CHARCOAL. HOW TO MAKE A HOME MADE LEAK TESTER - YouTube
made mine out a small metal paint can using my 12volt air pump
also found this link for how to read and understand fuel trim=
Fuel trim can be a valuable diagnostic tool - Eastern Manufacturing

upallnight · #10 09-01-2014, 05:31 PM

Quote:

Originally Posted by 1iwilly

well i finally found a simple home made smoke machine will test this week link=
MAKE YOUR OWN LEAK DETECTOR W/ A JAR, TIRE PUMP & CHARCOAL. HOW TO MAKE A HOME MADE LEAK TESTER - YouTube
made mine out a small metal paint can using my 12volt air pump
also found this link for how to read and understand fuel trim=
Fuel trim can be a valuable diagnostic tool - Eastern Manufacturing

This is a lot cheaper not unless you like Cuban Cigars.

https://www.youtube.com/watch?v=zMok2y05jNE