One of my friends has a 2002 civic si...he bought it used. After he bought it the check engine light came on and it threw the o2 censor code. The guys who had it before him put Crane cams in it and it also has a header cat back exhaust. He has been having problems cause it wont hit vtec, someone told him if he fixes the o2 senor that will solve the problem i no that wont fix it though. I really dont know very much about the i-vtec does anyone have any ideas what could be wrong with it?

 

Does anyone have any idea at all?

 

I've got the same car, and without mods, it truly isn't that noticeable unless you know when it engages and what it sounds like. It isn't as "abrupt" as their other VTEC systems.

 

if there are check engine lights on then the engine wont engage into vtec untill u fix the problem witch is the 02 senser

 

Well thats what he thought but the o2 sensor has nothing to do with vtec i have a b16 and my o2 sensor is going bad and th check engine light will come on when i am driving but it still changes over

 

Wait... When the hell did the K20A3s have a vtec crossover?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FutureITR &raquo;</TD></TR><TR><TD CLASS="quote">Wait... When the hell did the K20A3s have a vtec crossover?</TD></TR></TABLE>

yea vtec on our k20a3 engines comes at like 2200 rpms and its only on the intake cam.

 

a3's dont have OHH **** VTEC that hits at 5k rpm..its kicks in at like 2500 rpm .. its not noticble except for a little sound you really have to listen for..

-Navid

 

si vtec changesover at 2500 rpm and the power band run til the rev limiter? the worst part is not knowing much at all about these motors. im not used to the i-vtec

 

so vtec changesover at 2500 rpm and the power band run til the rev limiter? the worst part is not knowing much at all about these motors. im not used to the i-vtec