silverbeast

iTrader: (16)

Hey guys, well i have a problem with my car. I installed a ported fast about a month ago and just had a chance to get to the dyno and check it out. I want to say i do not think anything is wrong with the intake. It looked awesome but i have something going on we cant figure it out. My car made 423 rwhp and like 396 rwtq before the intake was taken off and ported. On the first pull today it made 382 rwhp 340 rwtq. The AFR was off the charts rich, like 9.5. What would make the car run this damn rich? Anyway Jeff checked everything out and couldnt find any problems so he leaned it out and got it back up to 410 rwhp and 378 rwtq. The AFR is on 13.5 but it is still down on power. Could my MAF sensor be dirty and not reading correctly? I went ahead and picked some new plugs up and im going to clean my MAF sensor. Now if i clean it will i have to go get it retuned? Im worried it will run lean since we had to adjust the tune that much. Anyway guys thanks for any help or suggestions. Charles

YellowToy/A

iTrader: (1)

13.5 is to lean. 12.9 would be better. It sounds like what ever was done to your intake did not help it flow better. As long as the a/f is what is requested the MAF is working. Is there some new restriction in your air intake system. Air filter? Like that

MNR-0

Did you plug the intake air temp back in?

beaSSt

Have you scanned the car and looked at your STFT and LTFTs?

If these are commanding lots more fuel (high positives) you may have a vacuum leak somewhere and you are getting unmetered air (after the MAF) that is being sensed by the front O2s perhaps?

I had an intake leak and I could reset the PCM and the car would run fine. Then over a short period the fuel trims would go to +25 and the car would hardly idle it was so rich.

silverbeast

iTrader: (16)

yes, everything is pluged in. What would make the car run that rich? Any ideas? Even if the intake wasnt ported right i dont see how that would make it run off the chart rich. I think i have a problem somewhere else. On the way home from work it gave me an ses light so something is up.

Shallow Bay

iTrader: (3)

Can you get the car scanned? It would be very helpful to know what DTC(s) is/are being thrown.

edcmat-l1

iTrader: (10)

If your MAF was dirty, it would go lean. Always. They way they function, if you insulate the hot wire, it cant do any but go lean.
Something is telling it to add fuel. Take a good look at the MAP. If you didnt get it in good, that could cause it.

silverbeast

iTrader: (16)

i got the car scanned today because a code came up. It was a p701 i think. it said it was lean. And something about one of the 02 sensors. I am going to replace both of them just to be safe. I was wondering if a leak would cause this... i will pull the intake this weekend and reinstall it and i will check the map. thanks for the help guys. If it is coming from an intake leak and i get it sealed then the tune will be very lean right? Because he adjusted the tune and leaned it out or will it be fine? Damn i need a wideband.well thanks guys.

myfast70

iTrader: (38)

Umm, did you install the button head bolts that were supplied by FAST? If not, you more than likely cracked your lower intake and caused a major air leak. Some people have had success JB welding them back together. Although expensive you can always order just a lower intake and have your porter re-port it to match the upper. You can also order just a hardware kit if you do not have the proper boltd.

silverbeast

iTrader: (16)

The intake has been on the car for over a year and a half and was taken off and sent off to be ported. So i dont think that is the problem unless the shop that installed the intake the first time didnt change the hardware. I am going to take it off this weekend and check everything out. thanks for the help. Charles

408z28

iTrader: (44)

Mine did that with a ls2 intake. We smoke tested the intake and found a 2 vacume leaks. It got so lean that the pcm was over compensating and maxing out my injectors to make it run way rich. Loosen up your intake, then re-torque it...you should be fine.

silverbeast

iTrader: (16)

thanks i will try that. I wonder if i'll have to get it retuned. Jeff at Mayhem adjusted the tune because we couldnt figure out what was going on. It makes me wonder if it will be way to lean where we leaned it out so much. any idea?

2QUIK4U

iTrader: (7)

I know it sounds stupid but check to see if the TB is opening all the way. When I first put my Fast intake on I didnt adjust the throttle cable length and it was only opening 60%. The Dyno graph was way rich. It had the same affect my numbers went from 422 to 380. Once I got it to open 100% the numbers went up to 450.

silverbeast

iTrader: (16)

Jeff checked it but i will double check it. thanks

myfast70

iTrader: (38)

What revision intake do you have? It will be very hard to see it, but there is a revision letter stamped on the back of the FAST. With the J revision they changed the mold design and caused the ports on cylinders 2 & 7 to shift causing a thin area when porting. If someone ports that area to heavily it will go thru the runner.

silverbeast

iTrader: (16)

hmmm, im not sure which one i have. I will check for this if i still have this problem after i reseat the intake. thanks for the heads up.

The Alchemist

iTrader: (19)

Any update on your situation? Did you figure out what the problem was?

silverbeast

iTrader: (16)

Yes i think i did,lol. I unbolted the intake and was going to reseat it and while i was doing this i checked my throttle body and every bolt was so loose i could turn them by hand. I tightened everything up but i havent went back to the dyno yet. I am going to get that done in the next couple of weeks and see if it is still down on power. I'll post up when i get the results.

The Alchemist

iTrader: (19)

Cool, so it sounds like you had unmetered air being introduced as well as the turbulance that it could have created.