Question about BMW 323

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Hi i have a 1998 bmw 323i and about a month ago i put in a xp performance chip into my car that i bought off the internet that said it would give me 40 more horsepower and change the gear shifts ect. the directions said to hook it up to my IAT sensor i hooked it up and drove it around. in about 5 minutes of driving, my cylinder was misfiring , my catylitic converter smell horrible like burning and there was black smoke coming out of my tailpipe. I then turned it off turned it back on, it fixed itself until i floored it. it then misfired. So i changed the chips power to 1 which it did nothing. I then called up the company in which they said to disconnect the battery cable for about a day to reset the computer i did this and it didnt work. i then was so upset that it deystroyed my car that i returned it. It now doesnt misfire but now the car will not go out of 2nd gear unless i slow down or push the gas hard. it also smells horrible and my check engine light is on which says the 2 o2 sensors. it also has black smoke coming out of the tailpipe when i start it up as well as a little blue smoke. when it warms up , i floor it and black smoke comes out. i floor it again and there is none. also the car when i give it gas the idle drops down hesitates and then goes. when i put it in reverse, i give it gas and the car stalls. about 2 months ago, i put on 2 ram airs into the car (cold air intake). when i start it up, it has jumpy idle and if you give it gas when its cold it putts like its misfiring and the exaust pressure that comes out of the car when its cold is incredible. it also has no high idle. the engine light also shows the 2 o2 sensors P1188 and 2 air codes P0170 which could be from the ram airs. i would just like to know if you know what could be wrong. do i need a new IAT sensor because of the chip that messed it up. thanks

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I think you will need to return car to BMW and ask for a reset of the management system ,i hvae no idea as to what this weekend boy racer gizmo could have done to your car but i suspect that the change in fuel mixture caused it to burn the O2 sensors out and also this has burnt the cat out so its going to be an expensive sort out job,i was taught at college 40+years that if you want a faster car buy a jaguar or a ferrai thats built with power in the design not try to add it later as the braking and chassis is not designed for this sort of increase in power ,

Posted on Mar 20, 2011


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