I have a CRX with a B20 block and a B16 Head, DH Racing Intake and BBK 70MM Throttle Body and DC Sports Header, through Borla Exhaust. We bought the cams and a whole Ferrea Valve train upgrade ,from valves to springs. Now we installed the cams (Stage III Comp Cams) and the Vtec won't engage. We put the Vtec solenoid from another one of out B16's to see if the solenoid was bad and it still will not engage. We are using a PR3 ECU that has a Mugen chip to engage the Vtec at 3800 RPM. What could be the problem?

 

maybe its your ecu...who chipped it?any CEL's?

 

yeah there is a check engine light, its a Mugen chip, it is off a CRX we have running 12.5's on a B16 with a 75 shot

 

have you run that ecu on another b16a crx to make sure vtec is working on their car?

 

was vtec working before you put the new cams in?
do you have enough oil in the engine?
how do you know for sure that vtec is not engaging? check to see that the signal is coming from the computer.

 

damm running 12.5 compression and 75 shot

yikes!!

I thought I was crazy running 11:8 compression with a 50 shot set up

but I guess

and well check oil this was a p[roblem for me not engauging vtec

make sure before u try to rev it to many times
cuz I made this mistake and messed up the main caps

 

First of all...Why are setting your vtec so low... bad idea. Its not going to do anything but hurt you. I recommend setting it at 4900 because my revs really never drop below that.