i did a high comp. b20 vtec setup... break in is done on motor, but no vtec??? i check all plugs and wirings is good, the knock sensor plug is not plugged becuz b20 block has no knock sensor... is there a way to check if ur vtec is working or wat can be a problem that caused the vtec not to work??? i was running a ls-vtec before the b20vtec and vtec kicked in and work fine... i tried 3 different vtec ecu and tats not it... lmk what ya think is the problem...??

 

anyone??

 

I have read that if you have no knock sensor hooked up then it dis engages your vtec, if that was the case you would most likely be putting out a CEL.

But with the last LS/Vtec setup I had I was throwing a CEL for the knock sensor and my Vtec kicked in good and hard...

You may also wanna try getting a whole new Vtec Selonoid and just putting that on. Or take it off and check the screen to see if its clean or not, and check your oil levels!

Also some more info, Like what EXACTLY is on the motor? Just all stock? And what type of car is it in??

 

last ls-v setup knock sensor plug was not plug in to and vtec worked... vtec solenoid has been clean of all with the screen on it... b20vtec set up has 12.5.1 arias pistons and crane cams st 2, its on 95 civic hb si... haven't really check the oil pressure but could tat possible be it?? wats an easy way to check it?? any one else got ideas??

 

do you have a CEL ?

 

oil pressure, vss, coolant temp

 

first off what ecu are u using is chipped to remove knock sensor

 

You can hook up an oil PSI gauge to your oil pump.

 

What do u mean by cel?? Anywase yeah ive tried a p72 ecu, p28, a chrome p28 ecu n no vtec at all?? Coolant temp is good... I haven't check the oil pressure I probably have to.. But then ive did ls/Vtec swaps about 3 different cars and this is actually my first b20 vtec and all the ls/vtec ive done had no problem even with no knock sensor plugged in and running on a stock p72 ecu... Has anyone else ever had the problem?? Is there another way to check your vtec???

 

CEL= Check Engine Light.

 

Check the oil pressure, also take a look at your oil pressure sending unit AKA oil pressure switch.

umm.. and check too see if your low on oil lol

 

LOL yeah i have a CEL on, its from the knock sensor, i think... oil pressure switch/ sending unit is all new... and yeah i'm good on oil... LOL... thanks for your help...


is there a way to test your vtec solenoid to see if its good, i heard something bout hooking up a wire to the positive term on the battery???

bump

 

I dont know how to test a Selonoid.

And you might just be unlucky and have to tap and thread a place and hook up aknock.

I have also heard of people wiring a knock into their ecu's and just zip tieing it to the firewall so it gets some vibrations and it will work but idk. I never put one on my lsv

 

If your cel is on for a knock sensor, then that means that your ecu is looing for a knock sensor signal. Two choices...get your ecu chipped and have the knock sensor disabled, or tap and thread in a knock sensor into your block and plug in it's respective plug.

 

you can ground the knock sensor wire to get vtec to work.

 

Coolant temp malfunction will cause VTEC to fail?

 

coolant temp and everything is good... i guess i will have to hook up the s300 and eliminate the knock sensor... thanks... well anybody got any other problems or ever had this issue??

 

why dont you check your CEL codes before doing anything else, and let us know. i previously ran with a knock sensor CEL and it never caused VTEC to not engage.

 

yeah, i probably have to do that... thanks...

 

once you have a CEL (check engine light) your car goes into "limp mode" and doesnt let you hit VTEC.

 

i'm wondering becuz theres been times when i have a cel and my vtec still kicks in, in my old setups...

 

thats not true... I am throwing a cel right now in my b16 vtec and hit vtec still.

 

Generally speaking, the ecu does go into safe mode when a cel appears. By the sounds of it there may be a few exceptions. The ecu assumes that running the engine in anything but base timing will damage it, including vtec.

 

are you you sure you hit VTEC? do you hear the crossover? whats the CEL for?

 

check your oil pump pickup it could be clogged i couldnt figure out why my vtec wouldnt work and i thought it was the oil pump and saw the pickup and i cleaned it and vtec worked flawlessly also check your grounds this also happened to me.