i just bought a 95 hatch with a b20b bottom end with a b16 head and i was driving it the vtec wont kick in, im not sure if its the vtec solenoid or what. as i was looking around i noticed i didn't have my primary o2 sensor and i was wondering if that could be the problem also. let me know what you guys think.

 

is your Check Engine Light on? also, your primary o2 sensor is pretty important lol. get one ASAP. and yes it could be the problem.

 

i dont think thats causing ur vtec problem, thats just a problem. we need more info to help u out i.e. cel, inop speedo, is it even wired in?

 

yeah my cel is on also so im kinda stuck i think the cel is on cause the header and **** its obd1 and my speedo and everything works on the car fine.

 

click on the cel sticky on pg1 let us know what it says

 

yeah step 1 is letting us know what the CEL is on for (could be multiple codes). Also, check your oil, it sounds dumb i know but better safe than sorry considering you just bought the car and i assume know very little about it.

 

since its a frank swap make sure its getting enough oil to the head is there any oil lines going to the head or anything? check the ecu maybe he gave you a non v ecu, also make sure vtec is actually wired in, there is soo many things it could be just start trouble shooting

 

there are several things that could cause this and i list some of them...
- bad oil pressure (you tapped the head wrong, dowel pins off, oil feed line ran wrong)
- bad ecu (check your cel codes)
- you didn't wire VTEC... link on how to
- bad VTEC solenoid (check to see how much voltage you have at the solenoid)
- low on oil
etc...

 

Sounds like the wires arnt in tach, plus low oil on b20 oil pumps wont surge enough pressure to vtec and then lead to not letting the pressure lock up vtec to engage. Make sure your pressure switch and solenoid have power and the car is warm. Vtec never works right when the engines cold.

 

the oil pump should not make a difference even though it is smart to run a GsR/ITR oil pump, 22t water pump and a timing belt

 

i got my vtec crakin the vtec wires wernt hooked up right to my ecu thanks for all your guys help!

 

Thats good news!