No VTEC after 10 minutes - a short date

[Accord_exR]

so heres the deal. ( SORRY for the long post )

it all started when my oil pressure unit ( low oil psi ((back of block)) snapped or something. not sure how it happened, but the entire wire got ripped from the unit and was no where to be found behind the intake manifold.

during this time my oil light would stay on.

car still drove perfect and vtec hit everytime.

time passes and gets to the point where vtec would work for 10 minutes of driving or so and then i would climb the tach and vtec would cut in and out. try hitting it again.. no vtec.. keep climbing tach and itll pop code 22

so i replaced my pressure switch

and it still was the same.
-----
now today i read that you can jump the solenoid and pressure switch wire together to fool the ecu into thinking it always has pressure. i did this because it was a easy way to "delete" the vtec control system.

once i did this it instead pop'd code 21 for the vtec solenoid....
so i call up a local shop and buy a vtec solenoid with the housing and it had the plug in the pressure switch spot.

now my car is tuned on chrome so i figured i could always disable my vtec pressure switch and the solenoid altogher.

so thats what ive done i put the new solenoid on and reburned my chip with the pressure switch and solenoid disabled, drove for about 15 minutes and go to hit vtec and it goes in and out of it.. try again and no vtec at all.

so this all leads me to believe that my problem isnt with my solenoid or pressure switch since it behaves the same with them disabled.

hoping the pros can chime in here as im really getting sick of this.

btw the vtp and vts delete was a temporary thing to test a theory, i wouldnt leave it like that. which is why im trying to figure out this damn puzzle.

hope some one can help.

[deevergote]

I really should know this, but I don't... does VTEC only rely on the oil pressure unit, or is there an reliance on actual oil pressure in order for it to work. My thinking is that maybe you actually DO have low oil pressure. As the oil heats up, it becomes thinner. If the oil pump has an internal leak (again, showing my ignorance, I don't know how the oil pump is designed!) then hot thin oil may result in lower pressure.

I'm reaching in multiple ways, but it's a theory...

[cb7rush]

You do have to have a good amount of oil pressure in order for vtec to engage. Simply having the switch there will not have vtec engage..and the sensor that makes vtec hit isnt the oil pressure switch its the vtec solenoid. Have you hecked your oil? Is it at the correct level?

[evil_demon_01]

If I read your post correct, you said you disabled the VTEC solenoid?
If thats the case VTEC will always be OFF.


As above have you checked the oil level, coolant level, and also cleaned the VTEC solenoid mesh filter?