this is my headache my car is ok until it hits vtec. when it goes into vtec the car starts stumbling like its hitting the rev limiter. i had a CEL and its o2 bank 1 o2 bank 2 low voltage i changed the sensor with NGK's.the 3rd CEL is system to lean im running premium fuel new fuel filter new spark plugs.the motor is a B16A2 if anyone has any ideas please let me know.

 

im confused...did you change the o2 sensor or replace the spark plugs with NGK's? and also what exactly were your codes because the code you said was more of a run-on of two similar codes.

 

do you have oil? well enough oil that is

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bkmc24 &raquo;</TD></TR><TR><TD CLASS="quote">do you have oil? well enough oil that is</TD></TR></TABLE>

yeah that could also cause it, wouldn't cause your engine light but would cause vtec to feel weak due to lack of oil pressure.

 

replaced both o2 senors with ngk and also changed the spark plugs with ngk's. the car has the right amount of oil i checked that first.

 

did your CEL light come back? maybe your cat is toast (if you have one) see if you have a catalyst efficiency code.

 

the code isnt back. i fixed that part. just cant seem to find the problem with Vtec stumbling

 

im having the same issue with my 99 si sounds like vtec turns on when it wants, now my car redlines at 6700 rpm could be the silanoid but i havent checked it out yet