Ok, I have noticed ALOT of people recently asking about why their vtec isn't working. I'm just going to do some of the basic steps in checking to see why the **** vtec isn't working .
1) Oil level, its gotta be FULL. I'm talking at the upper mark on the dipstick.

2) Solenoid, Ok this is a 2 parter. A) take a wire (any wire) disconnect the grey plug on the vtec solenoid and touch the wire to the pos. battery terminal and the solenoid side of the grey 1 pin connector. there should be an audible click from the solenoid. B) If A checks out, remove the solenoid and clean the filter screen. (self explanatory)

3) Speed, the car must be going over 10 mph so the spedo must be working. that means the VSS has to be working. vtec is temperamental isn't it?

4) more oil, check the oil pan. if its dented POUND IT OUT!. this is why mine wasn't working. the pan was dented in far enough to hit the oil pickup for the pump to cause low pressure situation in the head, no pressure no vtec.

5) ECU Swap out to another ECU that you KNOW vtec works on.

Thats a basic troubleshoot for it. if i missed anything or got anything wrong just reply and ill change the info.
If you go through all this and it still doesn't work its oil pressure (the pump) or wiring related. so check all the wires for vtec.
Thats it i hope it helps some people.
Joe

d'oh
Thanks katman i knew i forgot somthing.

gotta have a vtec motor as well

i thought the speed had to be 19mph, plus the oil level doesnt have to be full, before i realised how much oil i was using i was running around for a week with the oil level not even registering on the dipstick, took almost 3/4 litre to bring it up to full, but the engine/vtec was working perfectly. I think the actual temp has to be 74 degrees before it will work.

At a pre-designated RPM, if and only if there is enough oil pressure , the CPU activates a solenoid. This causes a pin to lock the intake valves together creating a sudden jump in acceleration. To activate the second stage at 2500 rpm(both valves opening), oil pressure is diverted into a channel that drives a pin which connects intake valve rocker #1 with #2. Now, both intake valves are being operated in unison. This is perhaps not quite as ideal as a little valve stagger (as seen in the DOHC VTEC apps), but sufficient enough for good power.

To enter the third stage, at 6000 rpm, oil is now allowed into a second channel connecting all the rocker arms. This oil drives a pin which connects the linked #1 and #2 rockers to the center lobe actuated #3 rocker which is, of course, the high lift and duration mode.

Frankly, the implementation, from an engineering standpoint, is absolutely brilliant.

yes it uses pin do u think i would just waste my time writing that for the hell of it

yes it uses pin do u think i would just waste my time writing that for the hell of it

ROFLMAO!!!!!!!!!!!!!!!!!!!!!!!!!

maybe if YOU wrote it...

http://integra.vtec.net/engine/vtec.html

cya,

t..

6) Car must be at I belive its 80 degrees or higher so let car get to a normal operating temprature.

actually, you didnt forget.

At a pre-designated RPM, if and only if there is enough oil pressure , the CPU activates a solenoid. This causes a pin to lock the intake valves together creating a sudden jump in acceleration. To activate the second stage at 2500 rpm(both valves opening), oil pressure is diverted into a channel that drives a pin which connects intake valve rocker #1 with #2. Now, both intake valves are being operated in unison. This is perhaps not quite as ideal as a little valve stagger (as seen in the DOHC VTEC apps), but sufficient enough for good power.

To enter the third stage, at 6000 rpm, oil is now allowed into a second channel connecting all the rocker arms. This oil drives a pin which connects the linked #1 and #2 rockers to the center lobe actuated #3 rocker which is, of course, the high lift and duration mode.

Frankly, the implementation, from an engineering standpoint, is absolutely brilliant.

At a pre-designated RPM, if and only if there is enough oil pressure , the CPU activates a solenoid. This causes a pin to lock the intake valves together creating a sudden jump in acceleration. To activate the second stage at 2500 rpm(both valves opening), oil pressure is diverted into a channel that drives a pin which connects intake valve rocker #1 with #2. Now, both intake valves are being operated in unison. This is perhaps not quite as ideal as a little valve stagger (as seen in the DOHC VTEC apps), but sufficient enough for good power.

To enter the third stage, at 6000 rpm, oil is now allowed into a second channel connecting all the rocker arms. This oil drives a pin which connects the linked #1 and #2 rockers to the center lobe actuated #3 rocker which is, of course, the high lift and duration mode.

Frankly, the implementation, from an engineering standpoint, is absolutely brilliant.


Yo, you must have the good drugs. The both valves always open, not one untill the "1st stage" which doesnt exist, if you actually look at it 2 cam lobes are always touching 2 rockers. Those are typically ALWAYS working. Also, how is it, do you suppose, that you can get three stages of vtec where oil is diverted here and there when there is only one vtec solenoid per engine.

Please explain to me how you get oil to travel selectively around vtec rocker arms pins. Have you ever taken apart a vtec head. I have taken apart quite a few, and I'll tell you, I've only found 1 path for the oil to take and I have yet to see it skip past the center to engage both outside rockers. For what reason somone would want to do this is beyond me since they always work and dont need to be engaged.

Im all about support and helping each other out, but if you dont know dont go and undo the help that others have provided.

You read me right, I think some one should try it Im not %100 postive though. put your VSS in a drill and disconnect MAP. I guess with any check engine lights the vtec doesnt work anyway huh. Oh well.

Spoon, no he is wrong. What he wrote makes no sense.


[Modified by kinesistech, 9:20 AM 6/5/2002]

what about throttle position?