heffnerp97

i just put a d16z6 in a 95 civic coupe that came orginally non-vtec and i put the z6 in it and i wired the v-tec solenoid straight to the ecu(A4 pin) and the pressure switch to (D6 pin) and when it goes to kick in v-tec it will stumble a couple of times and then hit v-tec but by then its already hit the rev limiter and i was wondering what could possibly be my problem...?

I heard u had to run one of the wires from the pressure switch to the ecu and the other goes into the wiring harness but i thought that u had to ground the other one out and run the one to the ecu(D6)

any help is appreciated

Shawn C

iTrader: (1)

vtec solenoid wire goes to A4 (which you have done), vtec pressure switch wires- one goes to D6, and the other goes to chassis ground (a good spot is at the thermostat housing where all those grounds are. that is also where your ecu is grounded, so make 100% sure that it is tight. you also want to make sure you have a good path to ground from that point (stock is through the engine/trans/through trans ground to frame rail. make sure all your ground wires are in place, nice quality, and make sense (i see tons of people with their valvr cover grounded to the radiator support. this wire is meant to ground the head, where the spark plugs need a strong ground connection. so make sure that ground wire is connected to a stud that screws into the head, not just the valve cover. (honda grounded valve covers until ~1990, from then on they were electrically isolated by gaskets and grommets)

anyways, so just make sure all your grounds are hooked up right. vtec sol - A4, vtec press sw - D6 & gnd. doesn't matter which wire you ground, either, since it's a switch. you're just sending a ground signal to the ecu to let it know it has oil pressure in the head when the ecu wants to engage vtec.

but this is also a reason to ground it with the ecu on the thermostat housing, since it uses the gnd signal as a reference. basically, the gnd signal going to D6 needs to be the same as the ground wires the ecu uses to compare what the vehicle's gnd signal is.

heffnerp97

yeh but another question will i HAVE to have a OBD 1 p28 or will the OBD 1 p72 run it???

Shawn C

iTrader: (1)

p72 will run it, but you'll have to chip it with a D16Z6 program, and disable the IABs (intake air bypass, gsr & h22 intake manifolds only) and the knock sensor (not on a D16) in crome