Fuel trim help?, short and sweet Options

[treydawgs4g63T]

Ok guys , i need to know what you guys know about fuel trims. My car is running way lean and i cant figure it out . All my fuel trims ( no matter if at idle or WOT ) are well over 100%. I have a walbro pump and the rest is stock. ALthough i do have a new fuel filter. I have switched the injectors twice now and that did nothing. The O2-R reading fluctuates between .3 to .9 all the time.

I just need some of your ideas since im not very educated on the hole tuning part yet. So just gimme some info on things to check. Oh, and ive also changed the FPR a few times also, my brother has my aeromotive on his car but i will get it back very soon.

thanks

[treydawgs4g63T]

What exactly are your trim numbers?  If you're injectors are stock your FPR is stock and you are running a Walbro 255 then you need to get an AFPR and bring the fuel pressure back down to stock levels.  That should take care of your problem.

so if im running a stock fpr and injectors the walbro pump will cause it to run lean? I thought that it would make it run rich as hell and its definetly not that case.

Also, im not using the AFCII anymore. So i guess im not actually tuning my car but making sure everything is in decent runing order.

Most of the time, the trims are as follows:
FTRL-120% on average
FTRM-110% on average
FTRH-111% on average
FTO2-100/103% at idle then anywhere from 143-54.6% while driving

the O2-R:
at idle its usually between 0.65-0.85 then veries from 0.00 al the way to 0.00-0.75

the INJD:
usually around 1.5% but has peaked at 14% during driving conditions