em1mata

ok so I have a 93 D16 and my vtec no longer quicks in, everyhting was fine but now it doesn't want to work. No check engine light goes on, recently, I changed the oil, could it be that it's over fueled or what? How can I go by checking if the vtec is working or what the problem is? Thanks!

Cln94EG1

Grab a Wire and 12V source then hit the top of the Vtec Head and Listen for a Click

92sihbk

what makes you think it doesnt work?

em1mata

SAY i HEAR A CLICK, WHAT HAPPENS NEXT? THANKS!

Cln94EG1

If u hear it Click then its working but if its not working while driving then theres other problems

blueEM1

check your oil level, my car had the same sort of issue, i was almost due for an oil changin then my vtec would iintermitenly work, checked the oil level and it was low, added oil and worked perfectly fine

em1mata

u think maybe it has a lot of oil cuse some guy told me that if it has a lot of oil the vtec won't function properly and I need to take some oil off, that single cam only takes in 3 1/2 quarters and I put in 4. U think it might b that?

Cln94EG1

Shouldnt be is your MPH's working

DougNuts

Where do I stick the 12v wire again? My vtec is also not working, at all. I have no CEL or anything. It apparently hasn't worked since I put in the motor. I've tried a new solenoid, didn't do anything.

Cln94EG1

The 12V wire goes to the top of the Vtec solenoid

DougNuts

Does the car need to be running?

Cln94EG1

No I did my check with it off the car so im sure u dont have to have the car running

DougNuts

Ok, I'm an idiot. Where do I get the 12V power from and where exactly do I touch the wire to on the solenoid?

Cln94EG1

12V Source This is what I used

And Heres My Sweet Draw up lol

NOFX

What makes the OP think his VTEC isn't working?

Cln94EG1

Dont Know

DougNuts

When I did the battery to top of solenoid, it sparked like a MFer. I didn't really take the time to listen for a click, but I did hear a nice electrical pop.

Cln94EG1

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DougNuts &raquo;</TD></TR><TR><TD CLASS="quote">When I did the battery to top of solenoid, it sparked like a MFer. I didn't really take the time to listen for a click, but I did hear a nice electrical pop.

</TD></TR></TABLE>
HAHAHA wear Gloves and Im sry u have to ground it also

DougNuts

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by cln92eg &raquo;</TD></TR><TR><TD CLASS="quote">
HAHAHA wear Gloves and Im sry u have to ground it also </TD></TR></TABLE>
Even with it grounded, I just manage to do a bunch of arc welding.

Syndacate

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by DougNuts &raquo;</TD></TR><TR><TD CLASS="quote">
Even with it grounded, I just manage to do a bunch of arc welding. </TD></TR></TABLE>

That's because you just connected a positive terminal to an open ground (the VTEC solenoid). It's no different from sticking a ratchet in between your battery terminals.

I don't know the proper decor for where you're supposed to connect the power wire, but touching it to an open metal body like that will give you the infinite ampere dilemma (I don't know if you've ever taken any computer science courses but if you did you'd know what that is) which is why it looks like somebody took a torch to your solenoid.

DougNuts

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Syndacate &raquo;</TD></TR><TR><TD CLASS="quote">

That's because you just connected a positive terminal to an open ground (the VTEC solenoid). It's no different from sticking a ratchet in between your battery terminals.</TD></TR></TABLE>

EDIT: The solenoid is working correctly when a 12 volt is applied. You have to apply the power to the plug, not just touch the solenoid.


Modified by DougNuts at 4:59 PM 12/28/2007

DougNuts

Ok, next step is to install a vtec light so I know if the ECU is sending power to the solenoid.

Now, my question is, is there a way to electronically turn on vtec all the time? If I could make vtec engage, then I can rule out a mechanical failure.

If the car is idling and I supply 12v to the solenoid, will the vtec engage or will there not be enough oil pressure?

wicked_b16eg

there are parts on the car that control this function, oil a signal to it from the ecu and a knock sensor. also it could be that it is working and you just not hearing it. hook a wire from selinode ( the one wire not the two coming from the pressure switch) to a light in you car then ground the other terminal of the light. Now Go out and see if it turns on or not. If it does then you have vtec.

DougNuts

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by wicked_b16eg &raquo;</TD></TR><TR><TD CLASS="quote"> also it could be that it is working and you just not hearing it. </TD></TR></TABLE>

I could care less about hearing it. My dyno graph that peaked at 5050rpm and took a nose dive tells me that vtec isn't engaging.

wicked_b16eg

but wiring some where, bad grounds? ECU? knock sensor, cam sensor, bad vtec selinode, oil pressure?