Intake mods

They still read it.

Have you cleaned your injectors? Sorry that just randomly came to me and I forgot exactly what the issue was lol.

you still got p0171? LOL maybe time to change the MAF?

I know it sounds like a pain in the ass but have you tried switching back to the stock air box? i remember when i had my SRI 9th gen it gave me the CEL but switched it back to stock and off it came..
Added: Jun 24, 2012 4:44 AM

Pepboys does it for free, just walk up to the counter...or buy the $15 bluetooth adapter and check everything on your laptop from volume to codes

No way!?!

Ya still p0171, it's done it since way before the intake mods.

...................so i changed the exhaust manifold gasket and donut gasket, light came back on, took it to a retired mechanic friend, he couldn't figure it out, just did compression test and fuel pressure test yesterday. Heres the results.

Compression
DRY 175 174 165 178
WET 182 180 173 180


Fuel Pressure: Ok so heres whats weird about it, i know when you turn the key over it's supposed to snap right up to pressure. I got nothing. Only when i turned the key over to actually start it did i get pressure, and even then it didn't snap right up, but instead raised to pressure over the course of about a second and a half. (I have been noticing rougher starts). Once running the fuel pressure stays at 48 which is good and doesn't fluctuate, and when i shut it off it stays at pressure and slowly comes down.

Is this normal? The fact that it wasn't snapping right up has me worried.

Again i have the P0171 P0420 codes. Im ordering a MAF as we speak.

did you change both o2 sensor? over time they get very burnt and start acting up...changed both on mine, MPG went up and idle nice.

the post cat sensor is just to measure the change in Ox levels. I don't think it really does much as far as how the engine runs? This is just what I've been told before. I know the pre cat can make a difference.

New MAF and Fuel pump, running smoother, fingers crossed

FUCK MY LIFE!!! What am i missing here? This is getting fucking ridiculous.

do you still have both codes? maybe check to see if one doesn't pop up anymore...

if you read he said he had the code way before any intake mods

Neither can i haha

I tried the swap too. it runs alright but it idles at like 1,500.

Car show bro

Isent that what windows are for?

You need to try putting the stock air tube and air box in there. This is most likely going to fix your problem..

You've got too much air going through that aftermarket intake and Now upgraded manifold and tb. The MAF sensor will not pickup all that extra air properly.
Added: Aug 9, 2012 6:58 PM
If you come EARLY Sunday morning to Modesto. I can help you diagnose your car for a few hours with my scanner Maybe we can figure this out.

Dmmit! Im going to be in Santa Barbara. Thanks for the offer though, i might have to take you up on that if my mechanic cant figure it out. It ran better after a new MAF fuel pump filter and plugs.

CorollaGT did you get a lean code?
Added: Aug 10, 2012 4:09 AM
Oh and could i request a picture of your grill from the inside/backside?

I got a lean code three times after the swap but after fixing my exhaust and tweaking everything so the exhaust didnt leak i was good. this was after the exhaust manifold swap though. and i'll take one later.

So got my car back from the mechanic, while doing diagnostics it was showing that when you gave it more gas, it would take gas away from the mixture instead of adding......Dafuq!? Like it was running backwards. Also, after disconnecting the battery and reconnecting the long term fuel trim was registering, (i think 18 if that matters) when it shouldn't be registering at all, 30 seconds after reconnecting the battery and not even starting. So we figured it was my ECU. Whatever i wanted to do a celica swap anyway.

You're not suppose to take account fuel trim values for snap and decel values. The MIL will only come on if the LTFT (Long term fuel trim) is out of range during steady driving and or idle.

Makes sense. Ok, what about the reversed fuel mixture? Less fuel when more throttle?

When you say less fuel, you mean LTFT or O2 values?