aREX4X

I am having a proble with my boost "bouncing". That is actually what the needle does on the guage, but it's really strange.

A little history: My car ran fine, seq. and all, then I installed a FMIC. It came with a BOV, and I had to remove my airpump too for the install, but that is all I did at this time. I did have the Upper Intake manifold off but I'm fairly sure I put it back on correctly and all the gaskets are in tact, and the lines are all capped as they should be.

Now, When the car reaches around 5000 rpm under WOT the boost goes on and off. I can hear the BOV letting off air a steady pattern. Every second it releases air. I seem to get 10-12-10-12-10-12.... psi throughout the upper rpm range. I have it set for 13-14 psi, and the primary makes a steady 14 psi before the transition, and holds it fine, then the secondary comes on line, and once it's all open it starts to "bounce".

To remidy I have bypassed the BOV (using a blockoff plate and the stock BOV) but that didn't work. All my clamps seem to be holding up becuase I have 14 psi before the transition. The idle is still good so I don't think it' a leak at the gaskets anywhere. I just last night tried to do the Poorman's Non-Seq to eliminate some of the solenoids being the problem, but now the only thing left to try is put in a Manual boost controller, but I doubt that will help.

What bugs me most is that my car ran perfect before this so I really should be in the new items that i've added, but before I spend xxhrs. taking out the FMIC and putting back the Stocker, I thought I would ask.

Thank you,

X...

aREX4X

Another thing I might try is the plugs, but that would seem odd that they just break between working on the car.

Does it sound more like a wastegate opening and closing because a solenoid is shot, or is does it sound like a leak in the system. From what I can figure a leak in the system would just be a boost loss, not a fluctuation in boost.

X...

aREX4X

I hate being the only one with this problem. I guess it's back under the car this morning.

X...

WaLieN

First off, blocking off the BOV is an AWFUL idea. The point of having a BOV is to vent the pressure somewhere when the throttle closes. By not having a place to vent, you are surging your turbos!

Anyways, the problem you see is obviously a sequential problem of sorts. My best guess would be that you have a problem with either your wastegate solenoid/actuator/lines. The Wastegate is not actively controlled by the ECU when below 4,500 RPM (the transition point). It could be that your wastegate solenoid/lines/actuator are leaking/sticking which is causing the wastegate to open and close ever so slightly, casuing that alternating boost after transition.

P'cola FD

Either you have a solenoid sticking, OR you could have some blockage in your intercooler. If their is more pressure on the turbo side of the intercooler than in the manifold, the car will do wierd ****. Do you put rags, TP in your intake pipes when you have the car pulled apart? If the intercooler is new, could there be some shipping peanuts in their?

aREX4X

When I blocked the BOV, I was using the factory one for relief in combination with the CRV. I'm sorry I was unclear on that. Basically I thought it might be that BOV leaking and because it had a flange welded to the pipes I couldn't just leave it off.

I tried the Non-Seq mod, and I tought that elimininates allmost all the solenoids.




I hope there is nothing in my intercooler, I checked it thoroughly before I took it apart, but that is something I hadn't thought of. I will check that and swap out whatever solenoid seem to still be used.

Thanks for the help guys.

X...

aREX4X

Pressure tested the pipes today, and it seems to leak at about 12 psi and stop at 10 psi, so I think I found the problem. I'll get T bolts on Tuesday and try it again.

X...

WaLieN

Which pipes were leaking?

aREX4X

The last elbow before the Intercooler was leaking in two spots. I bought the kit used off 1revnrx7 and he cut that pipe in half to try to make it work for a single kit. When he sent me the kit there was just an extra coupler in it, but where it had been cut there was no extra lip for the clamp to grab onto. So obviously it was leaking there, even when it was really cranked down, and also right at that end tank. It was just strange that it would only start to leak around 12 psi, and stop when it reached 10psi. That seems to be why I was getting this strange boost patteren of 10-12-10-12-10-12.... throughout the upper rpm range (whenever the secondary turbo came on line).


I guess I'll know tommorow for Sure!

x..