Scott Posted February 21, 2009 Share Posted February 21, 2009 I've searched and i've checked everything i can think of to no avail. Today i stripped the engine down to the turbo's and i'm still none the wiser. I checked both turbo's to make sure they were spinning freely and they were. The only thing i can't check is whether the hot side of the 2nd turbo has no blades on it. When i spun them they felt about the same weight so i think the turbo's are OK. The only thing of note that i have found is this. Could that be the issue? Something so small? I'm going to replace it regardless but i just want to make sure i have covered all the bases before i start putting the engine back together (next week). Here is what i have done so far today.... Quote Link to comment Share on other sites More sharing options...
Scott Posted February 21, 2009 Author Share Posted February 21, 2009 Oh, another thing. Where on earth is the pressure tank? I can't find it lol. Quote Link to comment Share on other sites More sharing options...
j_jza80 Posted February 21, 2009 Share Posted February 21, 2009 Bck right hand side of the engine bay. Black platic container. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 21, 2009 Author Share Posted February 21, 2009 (edited) Ahh i thought that was the charcoal canister thing. Cheers, i'll go have a look Ok, whats this thing?? Edited February 21, 2009 by Scott (see edit history) Quote Link to comment Share on other sites More sharing options...
Kev.O Posted February 21, 2009 Share Posted February 21, 2009 The pressure tank is under the lower runners on the passenger side of the car. Quote Link to comment Share on other sites More sharing options...
Scott Posted February 21, 2009 Author Share Posted February 21, 2009 The pressure tank is under the lower runners on the passenger side of the car. Under the what? Can i access it easily enough? I only have my own experience of working on cars. The terminology is wasted on me sorry. Could you point on one of my pics? Quote Link to comment Share on other sites More sharing options...
kaahari Posted February 21, 2009 Share Posted February 21, 2009 (edited) Under the what? Can i access it easily enough? I only have my own experience of working on cars. The terminology is wasted on me sorry. Could you point on one of my pics? You can check atleast pressure tank piping if you got small hands :D It is located near "9" in picture, under intake, you cant see it from enginebay: http://www.mkivsupra.net/vbb/attachment.php?attachmentid=13946&d=1112559170 Two metal pipes comes from driver side. They are connected with two rubber pipes to pressure tank (pressure tank lower --> pipe near firewall if i remember correctly...). Pressure tank is like soda can, two pipes pointing toward firewall. I had same broblem with my jspec, broblem was blocked pressure tank pipes btw, there can be a lot of else that leads to 2.turbo broblem, best is undrestanding supras sequential system so broblem solving is much easier... it can be cracked hose, faulty pressure tank, faulty egcv vsv, faulty iacv vsv, faulty egcv actuator, faulty iacv actuator... :blink: Edited February 21, 2009 by kaahari (see edit history) Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 21, 2009 Share Posted February 21, 2009 Ahh i thought that was the charcoal canister thing. Cheers, i'll go have a look Ok, whats this thing?? That's the pressure tank haha Check all the plumbing for the exhaust gas control valve - I once had a blockage in the metal pipe array that sits on top of all the turbo gubbins, so while the valve worked and the VSV worked, air still never got to the actuator. Try the tinfoil trick as well. Edit - while the car is in that many bits you can simply blow through each and every hose, pipe, and tube. Easy -Ian Quote Link to comment Share on other sites More sharing options...
kaahari Posted February 21, 2009 Share Posted February 21, 2009 That's the pressure tank haha Edit - while the car is in that many bits you can simply blow through each and every hose, pipe, and tube. Easy -Ian Hmm...offtopic but i have seen these broblems time to time on these boards, is there "guide-for-dummy" to identify these 2.nd turbo broblems? Quote Link to comment Share on other sites More sharing options...
supra matt Posted February 21, 2009 Share Posted February 21, 2009 Hi mate Bet i can tell you the cause of this And you wasted your time stripping the engine down if it's what i think Stock bov . I bet you any money you can blow straight though it IE blow though one of the big holes and air will come out the other side .When it should not if it's OK . Quote Link to comment Share on other sites More sharing options...
Scott Posted February 21, 2009 Author Share Posted February 21, 2009 You can check atleast pressure tank piping if you got small hands :D It is located near "9" in picture, under intake, you cant see it from enginebay: http://www.mkivsupra.net/vbb/attachment.php?attachmentid=13946&d=1112559170 Two metal pipes comes from driver side. They are connected with two rubber pipes to pressure tank (pressure tank lower --> pipe near firewall if i remember correctly...). Pressure tank is like soda can, two pipes pointing toward firewall. I had same broblem with my jspec, broblem was blocked pressure tank pipes btw, there can be a lot of else that leads to 2.turbo broblem, best is undrestanding supras sequential system so broblem solving is much easier... it can be cracked hose, faulty pressure tank, faulty egcv vsv, faulty iacv vsv, faulty egcv actuator, faulty iacv actuator... :blink: Thanks for that, i'll have a look next time i have the energy... i'm KNACKERED lol. That's the pressure tank haha Check all the plumbing for the exhaust gas control valve - I once had a blockage in the metal pipe array that sits on top of all the turbo gubbins, so while the valve worked and the VSV worked, air still never got to the actuator. Try the tinfoil trick as well. Edit - while the car is in that many bits you can simply blow through each and every hose, pipe, and tube. Easy -Ian I'm replacing as many of the hoses as i can, changing them to red lol. I never even thought of the rail etc being blocked. I'll make sure i check every single one as i put it all back together. Tin foil trick? Hi mate Bet i can tell you the cause of this And you wasted your time stripping the engine down if it's what i think Stock bov . I bet you any money you can blow straight though it IE blow though one of the big holes and air will come out the other side .When it should not if it's OK . I have an SSQV at the moment but i did think along those lines. I blocked off both of the pipes and took the BOV out completely... still the same lol. It doesn't matter about stripping it down, as i said i was carrying out a lot of work anyway. I'm pretty bad at getting round to things but once i do, i like to get them all done at once.... i never know when i'll be in the "mood" again lol. Thanks folks! Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 22, 2009 Share Posted February 22, 2009 Hmm...offtopic but i have seen these broblems time to time on these boards, is there "guide-for-dummy" to identify these 2.nd turbo broblems? http://www.mkivsupra.net/vbb/showthread.php?t=35926 Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 22, 2009 Share Posted February 22, 2009 Hi mate Bet i can tell you the cause of this And you wasted your time stripping the engine down if it's what i think Stock bov . I bet you any money you can blow straight though it IE blow though one of the big holes and air will come out the other side .When it should not if it's OK . If the BOV had failed he'd get no boost at all, not just when the second turbo comes online. -Ian Quote Link to comment Share on other sites More sharing options...
Ian C Posted February 22, 2009 Share Posted February 22, 2009 I'm replacing as many of the hoses as i can, changing them to red lol. I never even thought of the rail etc being blocked. I'll make sure i check every single one as i put it all back together. Tin foil trick? Fold some tinfoil into a long thin strip (say about 6cm longish) and bend it a bit at one end. Reach down to the EGCV actuator, prise it open a bit, and put the short bent end of the tinfoil between the actuator arm and the stop. Let the actuator close on the tinfoil strip, holding it in place. (I wish I had pictures for this!) Now go for a drive up the road and try to hit the second turbo. Park up and check if the tinfoil is still there. If the EGCV has opened up, the length of the tinfoil will ensure it falls away (making it tinfoil also avoids any embarrassing cardboard/exhaust system fires as well). If the tinfoil is still there, your exhaust gas control valve isn't opening, so exhaust never flows through #2 turbo so it never spins. This means all your boost pressure back flows through turbo #2 as soon as the intake air control valve opens. There is a minor issue that if the EGCV flutters a bit due to a partial pipe blockage, the tinfoil will still vanish - but cross that bridge if you get to it. -Ian Quote Link to comment Share on other sites More sharing options...
supra matt Posted February 22, 2009 Share Posted February 22, 2009 If the BOV had failed he'd get no boost at all, not just when the second turbo comes online. -Ian Sorry but i beg to differ i have two mate's that had this problem no second turbo the first one i helped out we changed everything all the pipes all the vsv , the pressure take but still the same . then i found the bov was shot so we replaced that all hey presto both turbo's back . The second one i just went straight to the bov and guess what it's knacked . Quote Link to comment Share on other sites More sharing options...
Scott Posted February 22, 2009 Author Share Posted February 22, 2009 (edited) Fold some tinfoil into a long thin strip (say about 6cm longish) and bend it a bit at one end. Reach down to the EGCV actuator, prise it open a bit, and put the short bent end of the tinfoil between the actuator arm and the stop. Let the actuator close on the tinfoil strip, holding it in place. (I wish I had pictures for this!) Now go for a drive up the road and try to hit the second turbo. Park up and check if the tinfoil is still there. If the EGCV has opened up, the length of the tinfoil will ensure it falls away (making it tinfoil also avoids any embarrassing cardboard/exhaust system fires as well). If the tinfoil is still there, your exhaust gas control valve isn't opening, so exhaust never flows through #2 turbo so it never spins. This means all your boost pressure back flows through turbo #2 as soon as the intake air control valve opens. There is a minor issue that if the EGCV flutters a bit due to a partial pipe blockage, the tinfoil will still vanish - but cross that bridge if you get to it. -Ian I'm not really sure what you mean by this mate, would i not need to take the turbo off to get to the EGCV valve? Edit, i'm with you now lol. I like that one. Edited February 22, 2009 by Scott (see edit history) Quote Link to comment Share on other sites More sharing options...
Scott Posted February 24, 2009 Author Share Posted February 24, 2009 Up we go. Quote Link to comment Share on other sites More sharing options...
Scott Posted March 25, 2009 Author Share Posted March 25, 2009 Sorted Quote Link to comment Share on other sites More sharing options...
Ian C Posted March 26, 2009 Share Posted March 26, 2009 So it was dead all along Quote Link to comment Share on other sites More sharing options...
Scott Posted March 26, 2009 Author Share Posted March 26, 2009 So it was dead all along Yeah completely fooked. I'll get some pics of it over the next couple of days Quote Link to comment Share on other sites More sharing options...
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