was going on honda tech i need some help my vtec is not popping i have a gsr swap in ek coupe ex with the ex harness. i put a p28 popped once and never again tried with many other p72 obd1 and 2 and nothing another p28 and nothing my vtec is wired up oil is good and grounds are good any suggestion???

 

Any CEL codes?

Does your speedometer work?

Have you checked oil pressure?

Is their oil in the motor?

 

oil is good
cel is speed sensor and o2 sensor

 

Thats why vtec isn't working....bad speed sensor.

 

https://honda-tech.com/forums/honda-prelude-4/official-%22why-vtec-doesnt-engage%22-thread-830163/

 

but it popped before even with the bad speed sensor

 

So its only kicked once?

Maybe it didn't kick, maybe you were just hearing things.

Not trying to be funny or anything...but just saying.

But I'm pretty sure that a bad VSS will cause vtec not to kick.

Check that link I posted.

 

no it kicked in more than once but very late with a different computer so i got another one and didnt pop again

 

Sounds weird man. Kicking in late? And then swapped an ECU and now it doesn't work at all?

Maybe someone else will chime in, but just go through that link I posted. I'll check back tomorrow and see whats up....I gotta hit the hay!

 

yeah i was pooping at 6000 rpm i wanted like at 5k rpm but thanks for the info

 

Do you know what punctuation marks are, of what they are used for?

 

Fix your speed sensor. Then come back and ask for help.

 

check resistance on your solenoid it should be from 12-20 ohms or something like that i forget atm..or remove the solenoid connect a wire to it and to a voltage source for just 1 sec(i actually mean 1 second or you'll fry it) and listen to see if it clicks..then check the vtec wire from solenoid to pcm to see if its still good..not enough oil pressure or the vtec piece being clogged with sludge could be other factors... well good luck

 

Fix the CELs, period. You can't halfass repairs.

 

That's one epic poop





*shot*
Sorry I had to
^^;;

 

Rocker arm cover oil pluges? Maybe ... Clogged filter screen? Maybe when v-tec gos to engage then ur stuck with a ground over load? The dizzy could be bad, from the v-tec rpm range / oil pressure ? Just thoughts

Use a jumper to test v-tec as a constant current
flow see if it works then back track!

 

 

SORRY TO ANSWER LATE BUT THE SPEED SENSOR WAS WIRED WRONG SENSOR WAS GOOD

 

Maybe you did a half *** swap? The car is probably completly hacked up. You proabably did NO maintaince to the motor before it went in. You aren't running the correct ECU for the motor. You have a CEL on.

Once everything is done correctly I'm sure VTEC will ACTIVATE/ENGAGE, not "pop"

At the very least fix the VSS, and run the ECU for that motor. Did your internal dyno tell you to set VTEC at 5k?

 

i didnt do a half *** job it was just when i bought the car always had the problem and but all i did was re wire the speed sensor wires to the plug