Installed intake pipe; now running rich?

[tim_korn_99]

I just installed an intake pipe and now the car is running way too rich. Fuel smoke was blowing out of the exhaust. My AFC settings were at -24% and i had to take them to -30% so it wouldnt blow smoke out. It pulls hard and gained a pound of boost from upgrading the pipe, but why would it be overly rich now? I didnt mess with any pressurized pipe, so there i didnt gain a boost leak from doing this.
This pretty much sums up what i did:
Drove car this morning, it was fine.
Parked car, popped hood, removed the entire air intake.
made my own hard intake pipe to replace the rubber accordian piece.
put everything on, tightened clamps, plugged in MAF sensor, and connect BOV recirculation tube
started car, A/F guage showed rich, when it never had before. I revved it a few times, and everything seemed fine, A/F guage was going from left to right like normal.
Went up the road, sound was definately louder, but WOT it was blowing black smoke and going slow.
Leaned it out some, and it got better.
Leaned it out more, and better yet.
Thats when i decided to ask what is wrong with it before i screw something up. leaning it out 6% so that it doesnt blow black smoke seems kinda drastic for just replacing an intake pipe, right?
-Tim

 

[I-luv-em-all]

maybe your old one had a leak or two in in, and you set ur AFC according to the leaks. now that this one has no leaks you have to retune it.

 

[tim_korn_99]

maybe your old one had a leak or two in in, and you set ur AFC according to the leaks. now that this one has no leaks you have to retune it.

Im pretty sure that it didnt have any leaks. I examined the accordian tube and it was fine.
I had to completely re-tune my car tonight. My settings now are ~ -34% in the HI throttle settings. They were -24% last night. I'm also flowing more air now, and i have no boost leaks. At around 6000rpms in 3rd gear, im flowing ~2250 hz on the AFC now, which is over 100 more than i used to. I know that the air tube free'd up a lot of restriction, because i can get 15psi in 5th gear at 2000rpm. Here's what i dont understand...
Installed tube = more airflow into the engine. More airflow SHOULD cause a lean condition with the same amount of fuel as i had, correct? But no, it caused an extremely rich condition, and i had to lean it out 10%.
On a side note, the car feels much stronger now, and seems to be running great, other than needed to be tuned on the LO settings.
I would think that an air leak would cause a rich condition, but i have -20vac at idle, and -23-24vac on decel. That's what its always had, plus, it pulls smoothly.
Anyone have an idea?
-Tim

 

[suicidal2af]

Im pretty sure that it didnt have any leaks. I examined the accordian tube and it was fine.
I had to completely re-tune my car tonight. My settings now are ~ -34% in the HI throttle settings. They were -24% last night. I'm also flowing more air now, and i have no boost leaks. At around 6000rpms in 3rd gear, im flowing ~2250 hz on the AFC now, which is over 100 more than i used to. I know that the air tube free'd up a lot of restriction, because i can get 15psi in 5th gear at 2000rpm. Here's what i dont understand...
Installed tube = more airflow into the engine. More airflow SHOULD cause a lean condition with the same amount of fuel as i had, correct? But no, it caused an extremely rich condition, and i had to lean it out 10%.
On a side note, the car feels much stronger now, and seems to be running great, other than needed to be tuned on the LO settings.
I would think that an air leak would cause a rich condition, but i have -20vac at idle, and -23-24vac on decel. That's what its always had, plus, it pulls smoothly.
Anyone have an idea?
-Tim

But if your accordian hose was leaking, you would be drawing in unmetered air, which would cause you to run lean. As a result, your tune probably would have accomodated for this...and then once those leaks are eliminated, you would run rich.

Just my 2 cents.

 

[tim_korn_99]

But if your accordian hose was leaking, you would be drawing in unmetered air, which would cause you to run lean. As a result, your tune probably would have accomodated for this...and then once those leaks are eliminated, you would run rich.

Just my 2 cents.

That makes sense now. Thank you. I don't know why i couldn't seem to grasp that last night....
Ya know, come to think of it, that accordian hose clamp never did get very tight... I bet that was the problem all along.
Thanks for the help guys.
-Tim

 

[97gstmr7]

check air temp sensor