Hey guys,
My 2004 s2k is having some problems.

This doesn't happen all the time I hit vtec, but only sometimes. Anyways, after I hit vtec, it revs till 7k rpm and then bogs down/loses power. It came with an engine code, which is P2646. Anyone have any experience with it?

 

No experience really, but in case you haven't looked it up, it's "P2646 VTEC Oil Pressure Switch Circuit Low Voltage"

I'm unsure why you'd have low voltage. Bad alternator? Bad battery? Bad Gound?

 

Have you checked the VTEC Solenoid plug? Unplug and plug it back in, make sure everything is tight.

I had a similar problem but much worse where I would hit VTEC, and then it would disengage instantly. I replugged my VTEC plug back in and she was as good as new.

 

Thats been checked already. Oil checked too. Not sure what I can do next.

 

Is the car warmed up when this happens? Say 10-15 minutes of driving.

If it's cold the ECU is killing the fuel.