Well I installed my new AEM CAI on my 99 tiburon FX 5 spd on monday. When I first turned it on, it was running realllly rough and black gunk was spitting out of the exhaust and it was just chugging at idle. I took it to my friend who is a mechanic and he said to just wait a week for the computer to adjust. Now, 4 days later my ecu still has not adjusted yet?? It's especially the worst when I first turn it on and it gets warmed up. I'll be driving along, come to a stoplight, then it will be idling so low that it dies. Or, I'll be in first gear, pressing the pedal down, and it's not geting hardly any power, and then all of a sudden a huge surge of power comes and I'm almost redlining it. About every other day the check engine light has come on. What's the deal? Has anyone else had these type of problems, how long does it take for the computer to get used to the new air???

 

Rather than wait for your ECU to adjust, force it to by disconnecting your battery and holding the brake down for about 30 seconds. Another thing to make sure of is that your MAF is installed the proper way, there should be an arrow on it, and you want that pointing towards your throttle body.

 

I'm pretty new to engine stuff and all, so I just disconnect the negative terminal, and press the brakes down? And what is the MAF?

 

Yeah, disconnect the negative and hold the break pedal down. MAF is the Mass Air Flow Sensor. The picture below is of my engine. Follow the CAI up towards the throttle body, see the black plastic assembly just past the foam (water bypass filter)? That is your MAF. If it is all installed properly, take it back apart and make sure there is nothing damaged on it, like the grid.

 

If that is the maf, the one that came with my AEM is larger than that and rubbery. I don't remember seeing an arrow on it. What year is your tibby, the engine is just like mine. And after you installed your CAI was your exhaust spitting out black gunk?? I'm going to take a pic of my engine tomorrow for you to check out..

 

The MAF is not included with any CAI. It is a few hundred dollars I think to get a new one. This is a 1999 engine, but they all are the same setup (as far as I know). The part I am talking about is directly after the bypass valve. I labeled the parts for you on the picture above.

 

The bypass valve is foam or rubber flaps. He's got the arrow pointing right at it. The MAF, or "Mass AirFlow sensor" is the piece behind the Bypass that has wiring going into it. If you look in it with the CAI disconnected you'll see a honeycomb grate in there. That's the MAF. Do not remove that honeycomb, and do NOT remove your MAF. If you had to disconnect any wires or wiring harness connectors to install your CAI, you did something wrong. There was also a air temperature sensor that was in your stock airbox, make sure you put that into the hole in your CAI also. If you didn't do that, or you installed your MAF backwards (There is an arrow on the MAF, that arrow should be pointing in the direction of airflow, or towards the THROTTLE BODY as posted in the picture), your car will run VERY bad and you will have unburnt fuel dripping from your tailpipe. So check all of those things. Then, disconnect your negative cable on your battery and leave for 15 minutes, pump the brakes a few times to get any residual electricity out of the system, then reconnect the cable. Your ECU is now reset. It will take 12 to 20 driving cycles (Starting the car, driving around for 5 or so minutes, shutting off = 1 cycle) to adjust to the new settings.

 

He should be fixing it this morning and getting back with us.

 

black gunk from the tail pipe sounds like unburnt hydrocarbons to me...

 

BluShark :READ THIS

http://www.hyundaiaftermarket.com/cgi-bin/...c;f=29;t=001042

If you need the pic I'll dump it back onto my webspace.
100% SURE YOU HAVE YOUR MAF BACKWARDS