So if i understand u correctly, if u unplug the vtec solenoid on an s2000 you will get no cel UNTILL you drive it past 6k.

Is that right? If true i will try it tomorrow.

 

Bad coolant temp sensor is very possible

 

I thought about it but according to my research the temp sensor is connected to an engine part. And i swapped the whole engine. Dont think both engines had bad sensor. Also sensor seems to work fine its always consistent. Thanks for the suggestion do.

 

In trying to solve this problem, I would try to figure out why there is no communication to your ECM with a scanner. Once your able to communicate, you should be able to activate the solenoid with the scanner under special function test. That's if your scanner has bidirectional functions. Also, attach a volt meter at the solenoid plug while activating with scanner. If you see voltage, you will know the problem is the solenoid. Be sure to have good ground. If nothing happens you could have an open wire between ECM and solenoid or bad ECM. But you should start by figuring out why there is no communication to your ECM with a scanner so you can see other important Pids such as TPS , CTS, VSS and any codes related to oil pressure. Your ECM might actually be in "limp mode" by the way p1259 is usually the code that will set when there is a problem with the v-tec solenoid.

 

Thanks for detail reply. I too wanted to know why my scanner didn't work. Could be my scanner, could be my car, dont know.

What i do know is that i tried 3 different vtec valves, and none of them fixed vtec (thats why i am giving one away)

When i replaced engine, a new harness came along with it, so dont think its an open or short between. But not ruling out possibility.

my ecu was replaced and didnt fix problem. Dont think its on limp mode, goes to 5k no problem.

Ground problem is only variable u mentioned that might be possible since its outside engine swap. Maybe i had bad ground before and continue to have it!? I did research and there is only one chasis to engine ground by left engine mount. I made sure to connect that during swap do.


I am thinking of taking it to the stealer, maybe they have a magic machine that finds out every problem cars have.lol

 

Thanks for detail reply. I too wanted to know why my scanner didn't work. Could be my scanner, could be my car, dont know.

What i do know is that i tried 3 different vtec valves, and none of them fixed vtec (thats why i am giving one away)

When i replaced engine, a new harness came along with it, so dont think its an open or short between. But not ruling out possibility.

my ecu was replaced and didnt fix problem. Dont think its on limp mode, goes to 5k no problem.

Ground problem is only variable u mentioned that might be possible since its outside engine swap. Maybe i had bad ground before and continue to have it!? I did research and there is only one chasis to engine ground by left engine mount. I made sure to connect that during swap do.


I am thinking of taking it to the stealer, maybe they have a magic machine that finds out every problem cars have.lol
[/quote]

If your not able to get your scanner to communicate, check the s2k service manual section 6-6 for detailed instructions. If you're mechanically inclined and have a voltmeter, you should be able to pin point this issue. I honestly believe you have an open somewhere. Maybe at valve, pressure switch or ECM harness open. It's really a simple system with not many wires to check.

 

Thanks for detail reply. I too wanted to know why my scanner didn't work. Could be my scanner, could be my car, dont know.

What i do know is that i tried 3 different vtec valves, and none of them fixed vtec (thats why i am giving one away)

When i replaced engine, a new harness came along with it, so dont think its an open or short between. But not ruling out possibility.

my ecu was replaced and didnt fix problem. Dont think its on limp mode, goes to 5k no problem.

Ground problem is only variable u mentioned that might be possible since its outside engine swap. Maybe i had bad ground before and continue to have it!? I did research and there is only one chasis to engine ground by left engine mount. I made sure to connect that during swap do.


I am thinking of taking it to the stealer, maybe they have a magic machine that finds out every problem cars have.lol
[/quote]

If your not able to get your scanner to communicate, check the s2k service manual section 6-6 for detailed instructions. If you're mechanically inclined and have a voltmeter, you should be able to pin point this issue. I honestly believe you have an open somewhere. Maybe at valve, pressure switch or ECM harness open. It's really a simple system with not many wires to check.
[/quote]

Well, i took the car to the dealer and they could find no fault. So i rode on the passenger seat holding their fancy scanners that showed me the exact moment vtec solenoid activated. And i was shocked and thrilled vtec kicked in !!!

There was no problem with the car it was me all along. This car needs to be driven like you stole it from first gear in order to stay on vtec. They told me to "gun-eit!!" Hard if i want vtec. Maibe the fact my other vtecs are automatic had something to do with it. Feel stupid but glad i solved this issue.

Thanks to all who helped

 

Yes the vtec engagement isn't at a set RPM on this car. It varies based on load & throttle input (and maybe other things, not sure).

 

Thanks for detail reply. I too wanted to know why my scanner didn't work. Could be my scanner, could be my car, dont know.

What i do know is that i tried 3 different vtec valves, and none of them fixed vtec (thats why i am giving one away)

When i replaced engine, a new harness came along with it, so dont think its an open or short between. But not ruling out possibility.

my ecu was replaced and didnt fix problem. Dont think its on limp mode, goes to 5k no problem.

Ground problem is only variable u mentioned that might be possible since its outside engine swap. Maybe i had bad ground before and continue to have it!? I did research and there is only one chasis to engine ground by left engine mount. I made sure to connect that during swap do.


I am thinking of taking it to the stealer, maybe they have a magic machine that finds out every problem cars have.lol
[/quote]

If your not able to get your scanner to communicate, check the s2k service manual section 6-6 for detailed instructions. If you're mechanically inclined and have a voltmeter, you should be able to pin point this issue. I honestly believe you have an open somewhere. Maybe at valve, pressure switch or ECM harness open. It's really a simple system with not many wires to check.
[/quote]

Well, i took the car to the dealer and they could find no fault. So i rode on the passenger seat holding their fancy scanners that showed me the exact moment vtec solenoid activated. And i was shocked and thrilled vtec kicked in !!!

There was no problem with the car it was me all along. This car needs to be driven like you stole it from first gear in order to stay on vtec. They told me to "gun-eit!!" Hard if i want vtec. Maibe the fact my other vtecs are automatic had something to do with it. Feel stupid but glad i solved this issue.

Thanks to all who helped
[/quote]

Sounds like you went through a lot of BS for nothing.

 

yeah true, but at WOT it will generally engage around 5500rpm.

If you are used to driving other Honda's with a noticeable punch when VTEC kicks in, then it's probably because they others' had modified air intakes, making the sound much more obvious.

Yo VTEC!