Running too Lean when Idling??

755hp

Goal - 755hp
Jul 19, 2012
164
0
0
Tri-State Area & MI
Hey guys, a buddy of mine just help me install my AEM UEGO Wideband afr. I've had it installed for a week now and when I'm idling my afr jumps back and forth between 14.8-16.5 (sometimes spikes to 17 and drops back down); on average I'd say it's around mid 15s. But when I'm at WOT, my afr is around 10.5. About two weeks before this another "Supra pal" sold me a used Bosch diverter valve off a Saab however, I've been backfiring a lot of lately; I think it may be leaking. I'm not sure of the type of Bosch this one is but I'm going to get another Bosch (but from Driftmotion; 110 type).

Question: What could be causing me to run so lean at idle?? Could this lead to engine damage even though its only when idling??

PS: I've been having knock sensors issues; throwing code 52. When my engine check light comes on I run even more lean at idle and rich at WOT; around 16.5 and below 10.

Any suggestions on how to tackle this?? Thanks.
 

755hp

Goal - 755hp
Jul 19, 2012
164
0
0
Tri-State Area & MI
IndigoMKII;2020144 said:
Lean at idle is fine.

Code 52 is knock sensors and it causes the ecu to pull timing and fully open injectors under wot

Ohh man, thanks!!

Sigh....holy shiet, I thought I was going to blow the f**k up.