i just recently swapped a 94 usdm b18c1 into my 92 vx for about a week my vtec would kick in at around 4700rpm now after about a week in the morning when i start the car up vtec doesnt doesnt work until after the car has been driven around for about 20 min. then it kicks in at 5200 rpm. and also after the car is warmed up, if i shut the car off it wont start again, or it will start then it will shut off quick then i can start it again and turn it off and then try to start it again and it will start then shut off again i'v checked all my grounds and my fuel pump and everything seems to be ok. i have no idea what the hell it is ??? please let me know if you have anyideas on any of the symptons.

 

vtec wont pop when your engine is cold,it has to warm up.

 

i kno. but when i would start my car when it was cold before any of this happend it always worked, it just recently stopped running good..

 

man i couldnt tell you,never experienced that,good luck