Hitting a boost cut but it not active

[mjalaly]

I keep having an issue where when the turbo starts to spool up it immediately cuts out, then i have to lift off the throttle and get back on it. This was an issue before i went in for another tune session last week. The tuners never had and issue on the dyno apparently but it showed up the second i left their shop. They replaced and re-gaped all the plugs because i thought the turbo was blowing out the spark. nope.

I was able to datalog it, i believe, yesterday and from what i can tell, boost cut is being activated on the car when it happens. The issue is there is no boost cut in the program as far as i know. this is something new that has been happening. Also i am using a Profect controller.

Any thoughts on what might be going on?

[Hondata]

It is because of the speed sensor error.

[mjalaly]

it has never been enabled as i use an independent speed sensor. so why would it show up just now? Also the check box for "boost cut if check engine code" is not checked. It also doesn't have any consistency with the boost cut. It will cut it at 1lb through 6lbs.

so if it needs VSS, that means Vtec is also not working? VTS looks to be coming on in the datalog

[mjalaly]

Does someone have an idea of how to get around this?? Will disabling the boost cut off resolve this? I am trying to avoid tearing the car down, removing the harness and wiring something in.

[AREA876]

if it needs VSS, that means Vtec is also not working? VTS looks to be coming on in the datalog

Vtec.jpg

The minimum speed for vtec is set at 0 mph so vtec will engage

[mjalaly]

Thanks. Any thoughts on how to get past the VSS boost cut thing?

[AREA876]

Try fixing the VSS signal

[mjalaly]

Yes I know that but that involves taking my car apart and cutting open the wiring harness. I am trying to figure out a way around it.

[AREA876]

How done you know it's a wiring problem and not the sensor ?

[mjalaly]

I just replaced the sensor as a test.

[strong1337]

Hello , did you fix your problem ? Ive exactly the same problem IVe done my dyno all was good but now since 1 week i cant boost , when i start boost read 0lbs then immediatly boost cut and my idle is bad . I ve read with smanager 1 error code VSS speed sensor IVe delete this error then instantly my idle is good .

Thanks you very much

[mjalaly]

I changed VSS sensor out and that didnt work. So i move the ground location for the VSS to the thermostat housing and it solve the problem.

[Spunkster]

Follow the factory service manual for troubleshooting the VSS error. That should lead you to the proper solution.