jdm-as-f@$k

ok so ive had my car for a year and a half and been through 2 motors an ls vtec turbo and now a b20 vtec turbo and on both motors vtec wouldnt cross over ive had it all re wired tried several ecu's it has plenty of oil pressure new oil pump and tried several solidnoids but nothing...runs just fine but after i cross 5500 rpms it throws a code any idea of what it might be?

importdreamer

"The ECM also looks at other inputs for VTEC operation - engine temp, engine oil pressure and vehicle speed (VTEC does not turn on unless the vehicle is moving). A separate oil pressure switch monitors the VTEC system. If a problem occurs, the ECM can turn off VTEC operation and will set a code, turning on the "check engine" light. In some cases, it can also cause a driveability problem."


Quoted from elsewhere. You might want to check a temperature sensor or the secondary oil sensor.

"The VTEC oil pressure switch is a normally closed switch. The ECM sends a voltage to the switch and expects the voltage to go through the switch to ground. If the ECM reads a voltage on that circuit when the VTEC system should not be operating, it will turn on the "check engine" light and set a code. This code will be a P1259 on a vehicle with OBD-II."

EJeff8

You sure you had a knock sensor on each engine?

jdm-as-f@$k

they told me i dont need 1 cuz i guess they eliminated it wen the chipped the ecu...so i still need 1?

jdm-as-f@$k

i think that it was throwing the pressure switch code but isnt that the 1 on the solinoid?

importdreamer

https://honda-tech.com/forums/all-motor-naturally-aspirated-44/not-gettign-oil-pressure-vtec-solenoid-port-2486207/

That's a fix for oil not getting to the solenoid. The pressure sensor is attached to the solenoid between the plug and the unit. Check the green wire on the plug for proper grounding.

EJeff8

I don't know if they have chips to just eliminate sensors. I know a P28 is very basic, tunable OBD - 1 ECU that won't look for it. But if you don't throw the Knock sensor code then I suppose you're okay.

jdm-as-f@$k

oh yea and i forgot 2 mention that wen i unplug the switch it sounds like it wants 2 cross over but it feels like a lack of gas wont let it but ill gocheck the wires right now

jdm-as-f@$k

i have a p06 but wait im gonna go see exacly what code it has but its definitly not the knock sensor

EJeff8

Facepalm.

A P06 isn't a vtec board. Is that why it's chipped?

jdm-as-f@$k

yea thats why its chipped i had a p28 but a resistor burned out and made the car act weird so i got this 1....but its code 21....vtec control solenoid

jdm-as-f@$k

but imentioned before that ive tried diffrent ecu's with my program and still nothing i dont even have a clue as 2 wat it is

EJeff8

Either it's a bad solenoid, the screen is clogged or the solenoid wiring is bad.

jdm-as-f@$k

chnged solenoid 3 times with 3 diffrent buddies whos vtec works and cleaned the screen with break cleaner

EJeff8

Then you have bad wiring.

importdreamer

Agreed.

99blackcivicSi

yes a p06 can be chipped for vtec yes you can take the knock senser and a few other sensors out of it i assure you i have one in my 4 door daily shitbox.

now as for your problem what vtec assembly are you using? usdm or jdm?

what kind of car is this? more info please

jdm-as-f@$k

usdm and its a 92 cx hatch

jdm-as-f@$k

you think it might be guides?