I am new to honda and acura so im still learning, but i bought a 1989 honda civic HB with a b18c and the vtec was not hooked up. it has the p72 ecu i was told. i have the 3 wires that go into the vtec solenoid hooked up and the o2 sensor, the vtec is either really weak so i cant tell or its just not engaging, advice/ info anyone?

 

Check what ecu you have first

 

It is a p72

 

Are you positive? In your post it says you were told. Never believe the person you bought a car from

 

i just checked, i looked at your pics and saw where it tells you so i looked

 

Here hope this helps
https://honda-tech.com/forums/hybrid-engine-swaps-18/%5Bfaq%5D-%22my-vtec-doesnt-work%22-1812135/

 

Also maure sure it wired up properly. Your ecu jumper may not be wired up right

 

ecu jumper?

 

You'll have a jumper harness for that ecu. What obd is the ecu obd1?

 

yes

 

So you have a jumper harness. Check the wiring on that

 

What is the jumper harness? this is the first vehicle ive owned like this, my last vehicle was an 86 chevy pickup

 

It's the harness plugged into your ecu so you can use an obd1 ecu

 

How do you know vtec isn't working?
Is your CEL lit up?

It shouldn't slam you into your seat as it's supposed to be a gradual changeover.
When you are driving and go over about 4500 RPM, do you hear your exhaust/intake change pitch?

 

Check oil

No oil no vtec