You ever notice when u slam ur car at 4k and it builds then once it reaches 5800-6k it gets alot louder

like the butterfly or secondary or whatever opens up?

mine stopped making that sound

what could it be

example is listen at the sound pre 20 seconds then at 21 seconds how it gets louder

http://www.youtube.com/watch?v=Luf4uAJ05U8

mine dont do that anymore it did before

i changed my oil but nothing else

ty

 

the ITR crosses over there and the secondaries on the gsr manifold open around there.

 

You are describing VTEC. There could be several things preventing it from engaging.

First, you should tell us what the car is. Year, model, is the engine stock, is it a swap, what mods do you have? Be more specific.

Second, research. There are plenty of threads about VTEC not working.

 

So what could my problem me

 

96 stock gsr minus intake

I read allthat but how can I isolate it

 

If nothing's happening around 5800rpm that means your secondaries aren't opening up. The GSRs have intake manifolds with two sets of intake runners, one short set (primaries) and one long set (secondaries). There is a set of butterfly valves that, when closed, prevent air from flowing through the shorter runners, causing the air to pass through the longer runners which gives you better low-end power. When the valves open up, the engine gets louder and air can pass through the shorter runners.

Is your Check Engine Light on? If so, pull the code(s) (if you don't know how to do this, search) and see what comes up. If not, there's likely an issue with the actuator that opens the valves, so look into that.

 

Check the filter on the IAB solenoid valve. At low RPM, vacuum is applied. The vacuum is released at ~5750 RPM. A clogged filter will prevent the release of the vacuum and restrict the IAB from opening.

Here is a picture of the filter. It is the cylinder on to of part 6.

 

here's your answer. with the secondaries gone in your new intake you won't hear them pop open. you did mean intake manifold right? i always get confused when people refer to air filters as intakes

 

that would be a good thing to know...do you just have an intake or a new intake manifold?

 

just an intake with an air filter

 

You could go under the hood and rev the motor to 6k RPM and watch the butterfly arm move on the drivers side of the intake. If it does not move then the butterfly is not opening, if it does then its working..