BigIslandSevens

iTrader: (4)

I' ve tested a ton of things. Here's the obviouse. Charge Control Actuator is not operating. Same with the turbo control actuator. Pressure tank holds pressure, vaccum tank holds vaccum, check valves are brand new, CCA operates properly with vaccum applied to chamber "A". So do the TCA, WCA, TPA.(when tested individually.) Charge control solenoid flows air in the proper directions at the proper time.(batt. applied) All hoses are new silicon. Here's the weird thing, when i apply vaccum to the hose coming off of the vaccum tank, i hear air (squeaking/leak) in the y-pipe. If i cover the coupler it gets muffled. when i blow air through and suck air from the CCA chamber "A" hose i hear the same thing. Also I'm pretty sure i hear the same thing from that area when the car is at idle. How can air get into the turbo y-pipe from the vaccum hoses? I had 10-5or6-5 boost pattern before work began. now my pattern is 0 accross the board and rarely will it (boost gauge) move to 1 psi. Any ideas guys? I've done as much as i can without pulling the UIM and checking all the hoses AGAIN. lost count how many times i rechecked when doing the rats nest and during this ordeal. please any good thoughts on the issue will help. I am CONVINCED that this is the root of my problems , now how to fix it.....?

Rx-7$4$me

REPLACE the couplers on the ypipe, or get an efini y pipe. You have a huge leak in there and thats why its not going above 0. And there are connections to the y-pipe from vacuum lines as well as from the turbo's themselves.

Check both the rubber couplers for tears, one at the y-pipe to xover pipe and that one from the x over pipe to intercooler. Thats most likely your problem.

BigIslandSevens

iTrader: (4)

i just put a greddy fmic on and all the couplers except the y-pipe are new. i have one here i will try. would that cause the CCA not to work though? i understand you would lose boost, but it's like i'm not creating any vaccum. I've confused myself by this point so please refresh me on if the coupler was leaking, would this cause the CCA and TCA not to work properly?

BigIslandSevens

iTrader: (4)

forgot to mention that when i hear the noise i have the pipe from the y to the new IC removed. i can look into the y-pipe)

Rx-7$4$me

AS far as I know unless u had a leak in relation to the CCA and TCA , they would still work, but if your not getting boost, and u hear a leak thats the first place I would check, especially when u said u covered it up and it stopped leaking.

BigIslandSevens

iTrader: (4)

Thanks for your input , every bit helps. when i said it went away when i covered it up i may have been unclear it still will not hold vac. or press. in the lines. Where in the CCA and TCA system can a leak get into the turbo piping? I activated the CCA manually with vac. and the air passage is the same as with the rod out.(leak sound is still there,won't hold vac.)as i said in the original post it worked prior to hose job and numerouse other things. The engine came out for the job if it helps lend any directions to go.

adam c

iTrader: (2)

I think you have another problem besides the coupler. Even if it is leaking, you would get some boost.

BigIslandSevens

iTrader: (4)

Thats my thought as well Adam C Is there a way to mimic the action of the vaccum tank? Using a mightyvac or something else? I would like to try and eliminate such things as a pinched hose at the check valve between the firewall and UIM.(Where the vac. tank gets it's vac. from i believe) I know the tank is good it just isn't recieving the vac. source. Thanks for your thoughts!

Rx-7$4$me

True, and not true. It realy depends on the size of the leak. Ever had one of those couplers blow off? You get 0 boost. It never goes above 0. So if the leak is bad enough but not quite equivilant to a full coupler popping off, he could be getting 0-1 pnd of boosts depending on how bad it really is. And even if its not that If it was leaking you will lose some boost from it so I would show some attention to that leak you discovered and figure out exactly what it is IE take the coupler off anc check it for leaks. And you did say it was a coupler that u covered up to stop the leak right? Sometimes that plastic x over pipe can leak, but I really havent seen that be the case that often. In fact I dont think I have seen that as a case.

You can do a vacuum system check by putting a vaccum pump onto the boost gauge nipple on the UIM and putting tennis ***** in each intake pipe and make sure they are tightened so no air can escape. If you have a leak you will hear it hissing somewhere. Just dont put too much pressure through the system.

when I had a 10-5-6 boost pattern, I did this, and I heard somthing but didnt know if it was hissing or what. So I just did the vacuum line job and found splits in a bunch of hoses.

BigIslandSevens

iTrader: (4)

The noise stops when i pinch the hose that goes to the nipple on the y-pie behind the 1" hose for the CRV. This is the sec. nipple from the top on the intake manifold.(the 4 that go trew the manifold) from what i can see this feeds the CCsolenoid as well as the CR solenoid. also i think it ties into the vac. tank in the rats nest somewhere. does this sound normal? My thought is that it is allowing all my boost to vent threw the CRV. Sound feasable? Now whats the cure? I will try putting it all back together and pinch that hose at start up and see if the CCA and TCA work properly. I'll wait a bit to see what you guys think. Keep the ideas coming guys , you already have kept me looking and trying different things to locate this possible cause, Thanks!!

Rx-7$4$me

You can plug up the CRV with somthing to see if its venting out when its not supposed to be, just dont do it to much. Im pretty sure someone told me to try this once, so It should be okay

Rx-7$4$me

wait... so it makes noise IN the y-pipe AT the coupler? IF so check for that leak in the coupler, fix the leak, and check to see if the sound is still heard which would indicate a possible leak somewhere else.

BigIslandSevens

iTrader: (4)

like i said earlier, it's kinda hard to explain location. When i blow air into the CCA hose(the one that plugs into cham.A) i hear air inside the y-pipe.(with the IC piping off)I can hear it coming from the rear of the pipe(firewall side) So i pinched the hose going to the y-pipe behind the 1 inch hose, the air noise stopped. Sooo.. the coupler is not the leak point for the noise i am hearing.(it may very well be leaking still under boost. just have to get some first to find out...hahaha!!) If i plug the hose this is what i think i may see... boost restored on the primary side but since i have it pinched, i'm thinking secondary will be off or not there. Does that sound acceptable? Thanks for the tennis ball tip that will come in handy. It reminds me of testing a 2-stroke dirt bike engine for leaks.Same theory.

Rx-7$4$me

http://www.scuderiaciriani.com/rx7/...se_diagram2.jpg

So if we were to look on there. your blowing air through the hose that operates the actuator that operates the shutter that allows the secondary turbo boost to come up the y-pipe.

So how will pinching that hose allow primary again? do you think that the actuator is failing allowing the primary boost to go past the flapper in the y-pipe?

Rx-7$4$me

ahh... so primary boost could be flowing through the flapper door if the CCA is not working properly and venting out the CRV, or the line coming directly off the y-pipe

BigIslandSevens

iTrader: (4)

yes thats what i am thinking. sorry for the long road to explanation!

Rx-7$4$me

haha no problem.. I got really lost at one point. Thoroughly confused, but now I uinderstand. You totally seem like you can take care of this problem You can try plugging up the CRV as it isnt supposed to do anything till like 4krpms anyway when it starts to vent the prespool of the secondary before the CCA pops open the flapper. JUST floor it momentarily at like 3 grand and see what boost u get. Then u should know if its venting in properly if the CCA is failing to work.

BigIslandSevens

iTrader: (4)

OK now i'm lost ! haha! I started the car and pinched the vac,hose i described earlier(behind CRV pick-up1"hose) The CCA still did not pull back! DOHH!! Maybe i need to pinch it before i start the car? When you say plug the CRV and floor it from 3k, and see what kinda boost i have, you are talking about seeing primary and seeing sec. fall off or what? Again i've overthought myself!! If you plug the CRV you won't be able to pre-spool correct? At around 4k plus correct?But i also will not be leaking primary boost out of it due to a bad /improperly operating CCA Thanks again man we are on the same page now i believe. I'm so close i can hear the problem laughing in my face!!

Rx-7$4$me

what im saying is that IF u plug the CRV, then if the primary boost is backtracking the secodnary path, it wount be able to vent out of the CRV, try plugging that vacuum line too. For if you floor it at 3k rpms when there is only primary boost and NO prespool of the secondary, you SHOULD get 10psi if it was venting out the CRV or the line coming directly off the ypipe.

When the seecondary prespool boost comes and hits the flapper, it has no place to go but out the CRV, which is what the CRV is designed to do, but if that flapper is failing you wont get any boost as it will continue to vent out the CRV when the flapper is closed shut. However u will get 5psi as teh primary still works.

Now, if that flapper is stuck open, and the CRV isnt shutting like its supposed to, your primary boost could just be yetting passed that flapper and out the CRV, instead of it being closed, and its going to the intercooler.

Rx-7$4$me

So to sum it up. the CCA is failing, causing the flapper to remain open. then, the primary boost backtracks the secondaries path in teh ypipe, and takes the path of least resistance, out the CRV. So that means your CRV could be failing as well.

Why are you sometimes getting 1psi of boost? Some of the air might be taking the correct path.

Now, before when you had the 10-5-5 boost pattern, if that actuator was failing, it wouldnt allow the Secondary to prespool, and it might have not been spun enough to even give you more then 5 psi from the primary, and couldnt spool in the allotted time from 5krpms-redline.

Rx-7$4$me

lol... that was alot of rabble and random info here and there.

Did it help?

wait a second I just had a second thought... did u just do the vacuum line job? did you possibly not hook some of the vacuum lines up correclt around the CCA and the CRV causing them to not work properly? double check to make sure those lines are all correctly connected VIa this chart.

http://www.scuderiaciriani.com/rx7/...se_diagram2.jpg

BigIslandSevens

iTrader: (4)

holy crap!!!! my brain hurts! I have to go get a couple of things so i can plug the CRV and pinch the vac. line while i drive. I will be back and try those two things and report the results. good thing i still have some daylight!

BigIslandSevens

iTrader: (4)

yeah i just did the hoses and i checked that sight as well as autosportsracetech site. as well as my Fact. ser. man. The hoses are hooked up correctly to the CCA and CRV. I thought of that as well. I'm 99.8% sure all hoses/vac. lines are hooked up correctly. I did one at a time what a mind ****!!

BigIslandSevens

iTrader: (4)

Well I just went for a drive and got some mixed results. I capped off the CRV and pinched the vac. hose mentioned above. No real improvements. tried with just the CRV and just the hose pinched. No changes. For the sake of elimination, i replaced the y-pipe coupler with a new heavy duty IC coupler. I went down the hill for some sodas and after driving mellow most of the way down I punched the gas. To my surprise i got put back in the seat with boost!! The CRV is still plugged, hose not pinched. I don't have the lights wired for the boost gauge so i didn't see how much was there. After the stop I turned on the interior lights so i could see the gauge. But no more boost!! Damit Jim!!!!! Now it is dark and i'm semi happy because I know I'm getting closer to curing the problem. My huge thanks to RX-7$4$me, You have been very helpfull. And your original diagnosis may be partially correct!!(y-pipe coupler) Still have some sort of issue though. I will try to keep this thread alive and hopefully still get some help! I have more to check when it gets light again!! Any other thoughts are greatly appriciated. Mahalo guys!!! "Dave"

Rx-7$4$me

well it really looks like your CCA works sometimes, and maybe doesnt others. So you had good boost for a second, and then tried again and it fails.

Also, did you double check to make sure all the hoses are hooked up correctly in that area ?