Tom-Guy

If oil pressure were the problem you'd get a code 22 for the pressure switch, not a code for the solenoid.

If the VTEC assembly was hogged out/worn so there wasn't enough actual pressure to maintain VTEC, but the pressure at the switch was still >50-55 psi so the ECU thinks there's good pressure, then you would pop in and out of VTEC with no codes.

You really need to triple check your wiring, and test with another solenoid, test with another ECU. Start with the VTEC solenoid, and check the screen for bearing debris. Any VTEC performance engine you should pull the VTEC solenoid every oil change (or anytime there's a wierd problem) and check for debris, it will save your a$$. Buying rods/blocks/cranks gets expensive.

I've seen a few odd P06-->VTEC conversions where VTEC works fine but throws a code 21 the instant you let off the gas pedal, I typically disable the CEL. Doesn't sound like an issue here, I mention it only for trivia since I've covered just about every other VTEC problem possible.

Oscar

Did you guys end up installing that o-ring right under the center cam holder?

91lsvtec

We have tried the P28, and a stock P13. Both ecu's result in the same thing.

Also tried another solenoid and another new screen. Still nothing.

Added a couple more gorunds to the motor/vc/head tonight to see if that might be a factor. NOPE.

and Yes, we installed the proper o-rings in the head. (2 of them).

one here..


and onother one on top..