Rep Power: 350

Under load doesn't mean "in boost". Load means you are not at full vacuum. Load is bascially anytime you have your foot on the accelarator. Obviously 20 in/hg is less load than 20 gauge psi, but load is load.

Whether your at WOT or not is not relevant to what your AFR should be, load and rpm are what is relative for tuning purposes. Remember, when you're tuning, you're tuning based on load and rpm breakpoints, not necessarily throttle position.

Another thing people are failing to realize is that if you have a d17a2, you have a vtec-e motor. You are only running 3 valves per cylinder at certain times. This is a LEAN BURN ENGINE!! What does that mean? Well, if you're cruising at 2500 rpm and -15 in/hg and you see an a/f value of 15.5:1, you're probably only running on 3 cylinders. Your load is low and you aren't throttling hard, your a/f ratio is perfectly fine.

But, if you're running at say 2500 rpm and you're load is at 0 vac and you're foot is on the floor, you're probably going to want to be around low 13's-11's and as long as your load continues to climb, you should see your afr's remain in the 12.5-11.0 range as the load increases and you begin to see boost increase.

 
Rep Power: 321

I'm still tweaking my car as i threw a cel for misfire on cylinders 1-2-3-4 because I didn't have cold enough spark plugs and i was running too lean. We went with 2 step colder spark plugs added fuel and during the day when it was warmer i was running good. But as it got cooler i began to run lean, so i added just a little bit more fuel and retard the timing some more. I am also running 577cc injectors and the AEM F/IC.

 
Rep Power: 244

what does retard the timing mean ..?? also .. i went back to my tuner for partial throttle tuning just on the street.. and he played with my O2 settings. .. i think its btter then b4 .. but i just don't seem to understand why at different times, the car behaves differently .. is it better to be too rich or too lean?? basically sometimes the car is too rich .. i haven't understood why but say at a stop i put in first, partial throttle, it will be at 10.0 and i shift 10.0 and then i let go of the gas and let it lean out slowly .. but under WOT stops at 12.4 at most, and mostly under partial now she's b/w 11-13.5 -- sometimes she also leans out which doesn't make sense .. i feel like it leans out if i speed up with no load then partial throttle ... it tends to lean ... i dunno its confusing lol

 
Rep Power: 350

Retarding timing means you're causing the spark to occur later. That's it. Advancing timing means the spark occurs sooner.

With no load, there shouldn't be any fuel because you decel with no load (foot off of the gas) unless you're idling. 10.0:1 is too rich for any condition, that's way too much fuel for any load breakpoint and rpm. If you aren't satisfied with your tuner, find someone else.

 
Rep Power: 244

is too rich bad??? does it make the HG pop like if its too lean ??

 
Rep Power: 281

Yes too rich is bad, ever heard the term washing your cylinders? Being a lil rich is way better than lean; however you are too too rich.

 
Rep Power: 281

AEM gauge reads between 10-18:1....so you show 10:1, you might be below 10....and yes, it is waaay too rich. Running rich will cause you less problems then being lean...at the end, either is not good.

 
Rep Power: 327

This can be fixed by spending DAYS tunning it in spare time. Im guessing your tuner dont understand how to tune for short/long term fuel trim? To learn how to correct this follow the link in my signature. Im far from a pro at tuning , but i spent countless hours and $$$$ reading and learning and playing with short term and long term fuel trim. It takes an OBD2 scanner in conjuction with either a wideband that data logs or a LOT of luck.