hey everybody, i just swap a b16a into my 91 si hatch and when i first drop it in, the vtec was working fine then like three weeks later the vtec just stop working, does anybody have any idea what it could be? thanks.

 

Bad oil pressure if it just stopped one day randomly, or your solinoid and its contributing wiring went south.

 

It happens to me to and it' the same swap.
My vtec will comes on and some time it shuts off with CEL on. Looked up the code and it was the oil pressure swich. I drove it like that for about 4-5 months and then decided to try and use the S2000 oil filter (Biger) since that day my vtec works ALL THE TIME and NO CEL. You might wanna test that out.

 

time for an oil change maybe??? make sure you have plenty of oil, check the oil pressure...... if that doesnt help, it could be your vtec solenoid

 

this should help you out nicely....

https://honda-tech.com/zerothread?id=830163

 

if the solenoid is broken it wont throw a code?

 

like everyone said, check your oil, also re-check your wiring

 

Does your speedometer work? If not, then plug the Vehicle Speed Sensor back into your transmission properly.

 

how do i do that? is it the lil cable wire goin into the tranny in the back next to the power steering? cause my speedomter doesn't work but my rpm does.

 

how would i check if the solenoid is broken ?

 

Don't worry about the solenoid....if your speedo doesn't work then that is your biggest problem.
vtec needs 3 things to work
1. oil pressure
2. VSS signal (speedometer has to be working)
3. motor has to be warmed up to operating temp

 

pull back the carpet in the passenger footwell and make sure the led is not blinking a cel code.
yeah, the check iengine light should come on, but maybe it be broken or something

 

yea i get a engine check light when i'm in 5 and i let gas go and the rpm drops then the check light comes on, i know it's code 17 but i'm not to sure what code that is to, and also, i just pulled out my VSS and put it back in but still no luck, running out of ideas.

 

your speed sensor could be bad........ i had the same problem with mine, get a new speed sensor and have it installed, that could solve it