Hi to all member,

My H22A4 is acting weird since break in period finished after rebuild. When the car is warm after start-up, my vtec engages normally @ 5500rmp. At next vtec engagement, kick is felt at 6000rpm and increase again to 7000rpm for next kick. When the engine is all warmed up, I have no VTEC at all.

I am using neptune (P28 ECU) to map the engine and my afr is all good. I have no error codes on neptune and TPS is set up right. I have tested the solenoid and it is clicking/working as should when 5500 is achieved. There is no dent in my oil pan also. I have ruled out the pressure orifice as vtec is activated as explained above.

Can anyone help/suggest or have experienced same issue?

Thanks for any input

 

How's oil pressure when cold and hot?
Cold oil = thick oil = more pressure
Hot oil =thinner Oil = less pressure.

Sounds like maybe something to do with oil pressure at the vtec solenoid or downstream of it. Possible that the locking pins aren't all engaging correctly.

 

Was planning to run the oil pressure test later today. Suspecting there is a problem with the oil pressure. Will keep you all posted.