Yup Yup... I experienced this first hand before... I had almost the same problems!

 

I'm about 80% sure my intake is 2.5".

 

because ur boosted! and tuned.. non tuned factory comp... NO good

 

OP is boosted too.

 

the same problems? hmm ill get it tuned and see if that helps, thanks alot

 

is it safe to drive this car at 17-18 a/f ratio?

will it cause damage, ive been watching for overheating problems and it keeps cool, i think that would be the only issue, right?

 

absolutely not. 17-18 is way too lean

 

check the o2 sensor

 

First things first. Did you reset your ecu yet?? If you have not then do that FIRST! I had very similar conditions that you had before but the only difference was I was turbo'd. It was not until it got really bad that I had a code that said my front o2 sensor was dead. One thing I did notice was it got better if I reset the ecu but only for a little bit. It would idle at 14 AFR for awhile but then suddenly it would idle at 10 or less AFR. After that it would always idle at 10 until I reset the ecu again. Anyways I would try and change your front o2 with a known working one.

 

no, ill reset the ecu tomorrow before the drive to work, didnt think of that, good idea. but thats only a temp fix

the o2 sensor i have is nearly brand new, it only has 700-800 miles on it...

have an appointment with shawn church this saturday, aem fic and harness should be here wed. or thurs.

 

im going to agree with ace on this one but as always check the small stuff first. i wanna say it could be vac leak or a leak at the tb, if not those look to tuning to fix this problem.

 

you will not most likely see any overheating problem since out stock cooling system can manage a lot of heat.. but those afrs absolutely arent good, you will lose a good amount of power with those especially on boost and will raise up your EGTs..

 

reset the ecu this morning by pulling out the glove box and pulling all the harnesses for the ecu, then plugging them back in a few minutes later (could not find tool to remove batt terminal)

afrs were tons better, way easier to drive. cruising in 5th resulted in about 14.5-16 instead of the prev. 18-20

i doubt its anything under the hood, i checked all vac lines, they are all fine. regapped the spark plugs already to .028

getting tuned this sat.

staying out of boost hoping my car will make it to saturday

still dying at every red light just about, all CEL codes are cleared and gone

thanks guys

 

i bet it has something to do with your maf! BUT once you do get tuned shawn will clean it up and ull be fine!

Put some water/meth in that car and tune it!

 

Why not just get a rental for the week? It'll be like $150 for a full week...which is thousands cheaper than replacing a motor.

 

Well the 07-08 maf is different than the 05. So if your using that engine with an 05 ecu i'd imagine there would be come calibration problems etc.

p.s. my 05 has a 2.5" intake at the maf, i know that for a fact cause i got one of those maf adapters that was 2.75" and didn't realize it made a difference untill i saw it was running lean.

 

Im using the '05 MAF.

 

oh ok, maybe spray some maf cleaner on it? Make sure the maf sensor o-ring got seated properly.

 

any update on this?

 

He has a Scion tc ecu on an XB thats the problem the Tc ecu runs diffrent for the scion tc setup even thnough they share same engine. wiring is more different.