waknight

I have a fairly happy 91 civic with a B16a engine, but my engine's computer does not seem to work right.

It's giving a throttle position code and the VTEC does not kick in. When I floor it there is a minor hesitation before it takes off... can anyone help?

I know where the computer is and I have a good working knowledge of general electronics (not automotive specifically). What kind of identifying markers will tell me if I have the right computer hooked up? I wanna nail this thing!

Jugglez

Get under the passenger footwell and look for the code on the ecu. it could be you're running a non-vtec computer. and check your tps sensor while you're at it. these things break fairly easily especially during a swap.

waknight

What code am I looking for and where? How do I check my TPS sensor?

I know electronics well, but I'm not brushed up on my automotive details... can a faulty TPS cause the VTEC to remain off?

Sassafrass

My friend just had a similar problem he was getting a code on his ECU and vtec was not working, it turned out it was a sensor that connects to the tranny, I can't remeber it for the life of me, something like VSS or something vechile something sensor, it had popped out, we shoved it back in and low and behold VTEC!

imported_gatherer

speed sensor maybe?

90ls

ecu code should say PR3 or PW0, if it says anything else its non-vtec

imported_nautica_t

how high can you rev too?
if your cutting off at 7300 or so that means your in reservation mode/vtec standby..check to see what code your getting, to check code, you'll see the red light flashing, a solid long red light means 10 and short flashes mean 1
so you can get 23 by having 2 long red flashes, and 3 quick flashes. i hoep you get what i mean....
good luck with that, and enjoy your vtec.

waknight

No tach on my car. If I find a code/model number on my computer can anyone verify it is the right piece? Maybe talk me through a check of this condition?

imported_nautica_t

sure, i can try to help ya out..
it shoudl say something like PR3 or PW0 if you have the right ecu