hi i did a h22a into a 92 civic hatch. i am not getting vtec. i am pulling 2 codes. one is the knock sensor(23) and the other is the o2 sensor(41). my knock sensor is broken and the o2 is not hooked up. but i should still be getting vtec. what happens is, is that when the car is just started up and is cold it runs vtec. when it warms up to normal temps or if u drive it for more than 15 min the vtec stops running and i notice a big change in the performance. also i am not hitting rev limiter early and i have enough oil in the car. the oil is a little above the second dot on the stick. i don't know what the prob is if someone can help it would be great thanks

 

From what I have heard the ECU will not allow VTEC without a working Knock sensor.

 

i was told that it would work.

 

not true. it works w/o knock sensor. so your saying VTEC only works when the motor is cold? when it warms up it stops working? hmm, maybe VTEC is working and the loss in power that you're feeling is the ecu running it rich cuz the O2 sensor isn't hooked up. hook it up and see what happens. hook the knock up too.

 

na i don't think its that. the vtec doesn't kick in. i sure of that thanks

 

please i need some help thanks

 

oh ok well usually when your motor warms up your oil pressure goes down. maybe you have too low oil pressure at normal temp that's why your getting vtec when cold but not when hot. what year is this motor?

 

i have a 92 h22a the oil level is good do u think i should switch to a thicker oil.

 

for the knock sensor and o2 codes -- get your P13 chipped to the Spoon Specs (which is like $30-$60) this disables most sensors, if not all. and you won't be throwing any codes

for VTEC you probably don't have it wired up right. I also have wiring charts for that specifically on what pin-outs it goes to as well, and you can check direct connections to the ECU.

just let me know.


[Modified by poison, 6:26 PM 8/20/2002]

 

the vtec is hooked up right. when i disconect the vtec lines it throws the right codes

 

I forgot to say that I took the distributor off and put it back quick and di not set the timing on it.

 

what I don't get is VTEC doesn't usually when oil temp/engine temp is cold and how yours is engaging when cold and NOT when it's at normal temp. you are sure they are on the right pin-outs correct?

make sure the oil pressure sensor is grounded and tied to the D6 terminal (blue/black wire at the firewall and leads to an orange/blue wire at the ECU connector which goes to D6.

also make sure the spool solenoid valve is connected to the Green/Yellow wire at the firewall leading to a orange/white stripe at the ECU connector harness, i believe.

hth