wot the f*ck happened to my VTEC?

[jOYRiDe]

just after the engine swap, my vtec was kickin in at 5700rpms....but lately (after many races) it kicks in at 6100rpms (i have a shift lite to shine when it hits vtec).... am i just driving the car too hard and now its failing? f*ck btw its a jdm b16a engine

[Moppie]

6100 does sound very high, have you checked the oil level? and ECY for codes.

Its possible your running low on oil pressure, and its taking till 6,700 to build enough to activate the VTEC. (but if its to low it will normaly set off the check engine light and run in limp home mode.)

I assume your VTEC light is wired off the ECU, which means its not a problem with the solonoid, but with the ECU sending the signal very late.
This could mean many things.
Its possible one of the sensors it faulty, and not allowing the VTEC to trigger untill 6,100rpm. Or it could mean your tack is out. Or the shift light is out.

On a B16a you can hear the change over, does it corospond with the light coming on?

[jOYRiDe]

yeah the vtec 'roar' and shift lite come on at the same time and i change the oil regularly.... oh and the shift lite is wired up to the solenoid, not the ecu

but there is a problem with the engine light coming on.... there is a piece broken off the back of the engine (my brother knows exactly wot it is) and he hasnt replaced it yet.. something to do with oil pressure valve i think (i cant remember)... the part is hard to find since its a JDM engine and a mechanic says that it is still possible to drive.... do u think it has something to do with my vtec problem?

this may sound a abit odd but would the vtec problem occur because there is not enough voltage/current to activate vtec?? i have no idea wot im talking about, could it be a possibility?

[AznRide]

Fix that problem and get a vtec controller...set it at 5000 rpm and you'll be safe. IMO

[Frostbyte]

Originally posted by AznRide
Fix that problem and get a vtec controller...set it at 5000 rpm and you'll be safe. IMO

That will not fix the problem that something is causing that VTEC to kick in late. Find out what that problem is VIA the ECU code. Then fix it, After that then get a VTEC controller if you want to. But forcing the car to kick in with VTEC early when there a problem may cause more problems.

[AznRide]

Originally posted by AznRide
Fix that problem and get a vtec controller...set it at 5000 rpm and you'll be safe. IMO

Originally posted by Frostbyte


That will not fix the problem that something is causing that VTEC to kick in late. Find out what that problem is VIA the ECU code. Then fix it, After that then get a VTEC controller if you want to. But forcing the car to kick in with VTEC early when there a problem may cause more problems.

---
What is the different between these two messages???I said fix the problem and get a .... he said that's not right, first you gotta fix the problem, then get a Vtec...maybe he just wanna show off his writing skill or something...

[Moppie]

Originally posted by AznRide
maybe he just wanna show off his writing skill or something...

And or his ingnorance on the matter.


Low voltage is an interesting possiblity. Check the earth conection for the VTEC solonoid, it may be dirty or loose.
Also if you can, trace the wire from the ECU to the soloniod, and check the ECU's Wires. It could be a loose pin in the plug, or somewhere.

If the ECU is not getting a correct message from any of the sensors it will throw a code, and oil pressure and temp are both important for VTEC activation. Its possible the Pressure sensor is causing the problem

I can get new parts for these cars, as so many are sold here that Honda NZ gets true replacement JDM parts. Iv already sent Setanta some bits like an engine mount that he couldn't get in aussie.

If you tell me exactly what the part is, or get a part number or something off it I can easily get you a new one.

[praxis]

Is that 'thingy' that is broken off, on the back of the engine possibly your oil pressure switch...that will definately cause this problem. Has it always been broken (since you swapped)? Do some looking around...the american version of your engine may actually hold the same part#.

vtec lights are dope. Ever thought of hooking your horn or a siren into the solenoid...just kidding.

[praxis]

I didn't realize that the image was that big...If you don't mind-edit it out. It takes forever to load.

SORRY!

[hondaman-iac]

Originally posted by praxis
Ever thought of hooking your horn or a siren into the solenoid...just kidding.

LMAO

i would say there is something in thge wiring. i'm not a vtec guy anyway.

[jOYRiDe]

Originally posted by Moppie


I can get new parts for these cars, as so many are sold here that Honda NZ gets true replacement JDM parts. Iv already sent Setanta some bits like an engine mount that he couldn't get in aussie.

If you tell me exactly what the part is, or get a part number or something off it I can easily get you a new one.

thanks for the help moppie, i'll have to check out wot exactly is broken (i havent seen it in a while cos my brother put it somewhere). i think its a black plastic piece, shaped like a tube and it is white inside with a single pin in the middle....here is a crappy drawing ( . ) hahah yeah its a crap drawing alrite

i'll check up on the part number (honda dealers dont know the number and jap wreckers are no help after u buy the engine)


thanks to u other guys aswell!!

[Moppie]

Originally posted by jOYRiDe
i'll check up on the part number (honda dealers dont know the number and jap wreckers are no help after u buy the engine)

If there isnt a number printed on it, then just tell me which sensor it is.
and where it sits. When facing the back of the engine, is it on the left, middle or right hand side.

[jOYRiDe]

Originally posted by Moppie


If there isnt a number printed on it, then just tell me which sensor it is.
and where it sits. When facing the back of the engine, is it on the left, middle or right hand side.

ok if where standing in front of the car, looking into the bay, the switch is located on the back of the engine, on the right side....its above the sensor where u can hook up an oil pressure gauge to it

[5_LiTeR_EaTeR]

Now is it on the block or the Intake manifold? you can't really see it if its on the back of the block standing there.... But it could be your Throttle Positioning Sensor on your throttle body. I am guessing that.