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67SS509
February 20th, 2008, 01:51 PM
Been tuning on a 408 this week. Dialed in the VE table then the MAF. AFR's are 12.8 at WOT and the l-trims 0 out. Problem is that when it sits and idles (in closed loop) the bank 2 l-trims climbs to +25 while bank 1 stays about -1 to -2. With the wide band on bank 2 it shows the afr dropping to 13.1-13.2 which says the pcm is actually adding fuel. Put a new sensor in and it did the same thing. Voltage from the O2 sensor is low so it's seeing a lean condition but the pcm is trying to add fuel. Anybody got an idea what is going on?

jfpilla
February 20th, 2008, 02:41 PM
Vacuum leak or header leak on that side?

67SS509
February 20th, 2008, 02:46 PM
I thought about that too but if it was a leak of some kind then the wideband would also show it as lean. I have double checked for leaks also.

67SS509
February 22nd, 2008, 03:45 AM
Turns out the new sensor was bad too. Replaced it :bash: with another new one and now everything is dead nuts.