optimus prime

Well, here's the deal. I recently acquired this car less than two months ago, so as of now, I'm very much learning the way the rotary works. My current problem revolves around secondary boosting, I'll try to be as descriptive as possible in explaining it ( I have searched. )

Boost Pattern: 9-5-5

Yesterday I was trying to diagnose my boost issue: I removed my air box, pressure chamber (held pressure) and removed various hoses and couplings to verify they weren't cracked or leaking. I checked the pills in the wastegate lines to make sure they were there and to check if the lines were loose. I switched the two plugs directly under the UIM to see if that was the problem, no dice. I also disconnected my main Cat to see if it could be clogged.

However, I did notice a sliced vaccuum hose going from some sort of actuator directly above the Y-pipe (don't know what it's called?) to the UIM. I repaired this hose and secured it back on to the actuator.

Here's how the problem sounds: It sounds almost as though there is some sort of Venting sound coming on TWO times during my power band. From 1-2.5k rpms, i hear this vent, then at full boost, it dissapears. I continue to 4.5k prms where the switch is supposed to occur, and again this VENTING of air comes on all the way to redline. It almost sounds like a wastegate of somesort? It makes a PSSHHH sound all the way to redline.

Any ideas on where this venting could be coming from? and if it's possible that it's venting my secondary turbo boost? TIA

BuffDaddy915

I would start by checking your Turbo Precontrol Vacumm line. When your looking at your turbos from the front, there is these 2 pot lookin things with vacumm lines coming from 1 side of them. Check the one on the bottom.

I would also take a look Turbo and Charge Control Vacumm lines.

Turbo Control is under the UIM. There is a conncector in the middle area on the left (passenger side). Check the vacumm hoses connecting to that.

Charge Control line connects to the outside (passenger side) of the LIM. Its the bottom hose. Then follow that back to the turbos and through under the UIM.

Start with that, then give us an update.

optimus prime

Ok i'll check all that stuff out and let you guys know what happens.

optimus prime

Ok after countless hours of searching, it seems as though the venting i'm hearing after 4500 rpms is most likely the charge relief valve not shutting. I haven't gotten a chance to check the lines that were mentioned yet, as i will be giving it a once-over on saturday when i have the time to; however, assuming it is the charge relief valve being stuck open, what sorts of things usually fail that cause that problem?

Kas

I had a similar problem last week it turned out being 2 loose nuts that tightenthe throttle body to the upper intake plenum,I had a huge boost leak for a few moths and thats what it was.

BuffDaddy915

Well if the charge relief vavle is staying open then it just failed period.

optimus prime

I know this may sound dumb, but does the CCA have anything to do with secondary boost issues? Reason being is that i was trouble shooting some more today and i found that my CCA doesn't move (did the KO/KO test.) If i read correctly, however, the CCA only affects primary boost? The funny thing is my primary boost is fine at 9 psi, but secondary drops to 4ish.....any info on this?