i just baught a honda civic 1994 vti i used to have a crx 1992 vtec and ive noticed when i go further than 5500 rpm my vtec doesnt open up and scream like it did in my crx... ive noticed some low idling revs when my car is stopped... could spark plugs be a problem im not sure can someone help me or does anyone else have this problem thank you.

 

what motor comes in the VTI?

 

If its a uk model then its a b16.

 

its a D16Y1 im from australia

 

For one thing vtec dont "scream" on a sohc, it is a smooth relaxed transition. Now there are 4 things that will keep you from going into vtec.

1. A faulty vtec selenoid
2. Your car has thrown a check engine light and is in safe mode
3. Lack of oil pressure
4. A faulty ecu