A friend of mine has a LS/vtec, that will not engage vtec. The block has a GSR crank, gsr rods, and ctr pistons. the oil pump is from a gsr as well. He is using a 91' B16 cylinder head. His ECU is obd0 pr3.

We went through and re-did his vtec wiring, and the rest of his harness is brand new from the dealer. The vtec wiring is wired correctly, and their are no breaks in the lines. This has been triple checked.

We just hooked up a oil pressure gauge today, to monitor oil pressure. At idle it sits between 20-30 psi. Under full throttle, it rises to 75-80 psi, and roughly between 5k-6k the oil pressure drops to 65 psi. Is this common when vtec engages? You can not hear a audible crossover during the time that the oil psi drops. So I am not sure what is causing this.

We checked to make sure all the cam caps were installed correctly, and that the dowel pin, and o ring was in the center cam cap. All of which is done correctly.

Any ideas on what else to check?

Thanks in advance.

 

this might be obvious but, is your speedo working?

 

Yeah, it is. Speedo, tach, coolant temp, all that is working. There are no CEL's either.

 

try a different ecu.

 

Tried that as well. We used another known good PR3.

 

u can take a 12volt switch and wire it to ur vtec selonoid go down the road and turn it on after 5K rpms if it works then ur plugs might not be all the way in the ecu, but if it doesnt come on then ur selnoid is bad, i have an h22 swap in my 90 accord ive got my vtec on a push button on my gear shift so anytime after 5k i can hit my vtec and when u mash it its like a shot of gas, it works realy great.

 

I figured we would probably try that today. We have put on a different selonoid. I would rather have the crossover wired correctly though.

 

My vtech isnt working either and my tach is spazzing out which it has done in the past, but now its different. Also, sometimes my vtech will work when the car is cold and when it warms up it craps out. Any ideas at all????

 

I hope you get a good answer to this one. It sounds like what mines doing. B20vtec obd0 pr3 as well.

 

i had the same problem n it came to be that the vtec selonoid screen was clogged up, we cleaned it out n bam there it was!

 

I'll do that this evening.