one more question, does anybody has some references about fuel trim numbers? I have Fuel Trim Long term on both banks around 10 (with ST close to 0 of course), idle or higher RPM.
Seems to me a little high, I would expect LT around 5.

 

That sound a little high. Does it have a custom tune in it or just stock?

 

Just stock tune, K&N filter, gibson headers, Borla exhaust.

I made a smoke test, no vaccum leak (in any case with high RPM Fuel Trim remains around 10 so vaccum leak is not the prob). MAF sensor cleaned.

Will check again some sensors as MAP or ECT.

 

I would get it tuned if i were you.

 

I made some tests again and now my fuel trim is much better, ST+LT = 2 on both banks.... See file attached.

The only thing I did was to remove the stock PCM and to install a used one, in order to reprogram it with J2534 device (I wanted a spare one in case of failure). But no relation with the concern...

MAP is ok (1,34V @ idle = 10.4''Hg, BARO = 28,7''Hg, so vaccum is around 18''Hg).

I have a JET Performance Programmer for the LQ9, I will tune the PCM with it now.

 

Yup, that looks to be about right.