Hopefully someone will be able to help me with this, im about ready to set the car on fire!

Recently started having issues with the car running lumpy, noticed what i believe is an oil pressure switch that bolts into the vtec solenoid had broken, since noticing that i have the problem of getting up to 6000rpm and the nothing, feels like iv driven into a brick wall! but it doesnt happen all the time. Iv tried another switch in the solenoid and it seemed to work for about 10 mins then had the same problem.. It feels like what would happen if the engine was cold and you tried hitting vtec but this happens even when i have 3 bars on temp gauge. car is a 2001 ap1 so hopefully someone can point me in the right direction!

 

You have a solenoid electrical switch and oil pressure switch that are both part of the vtec switching system. The Pressure switch is the top part of the vtec unit and the solenoid is in the block. Make sure the wiring connection to both is good and both switches are good. Also might want to pull the vtec unit off and check that the screen isnt blocked.

 

All wiring has been checked, iv had the solenoid off, cleaned etc. its annoying me as its not happening all the time just every other time i go to hit vtec

 

hows your oil level look?

 

oil level is spot on, was first thing i checked

 

id start by pulling the ECU fuse for a few minutes and then putting it back and see how it runs after that

 

Does cel pop up? I had the same issue and it went away when I replaced the oil pressure switch. Could be possible that you replaced it with another one that is bad.

 

iv already pulled the back up fuse out for a few mins and hasnt sorted it. The switch i have tried is actually off a friends car, i used it to see if that was the problem as i knew his is working fine and it still works fine on his, but i still get the same problem

 

Maybe the oil pressure switch is actually doing its job (shocking, I know) and you have low oil pressure and the thing is trying to protect your poor S2000 from major engine damage?

Go get the factory service manual and perform the tests. Or take it to a good shop.

 

iv already rigged up an oil pressure test and it checks out fine, and if oil pressure was actually low i would have the problem all the time, but it only does it every other time i hit vtec