Shane Posted October 16, 2016 Share Posted October 16, 2016 I do feel your pain, frustrating isn't it. If you have eliminated the VSVs and you know the turbos are capable of boosting by running it in TTC mode then you need to move on to the small hoses in the control system hoses. In my case and I think also a lot of other peoples, it was the hardest to get to hoses, two short lengths on each side of the engine that join to the hard pipes that run across the bulk head. As Chris said, most people wouldn't even know they are there and they are a bit of a nightmare to change with most of the operation done by feel. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 16, 2016 Share Posted October 16, 2016 Well, got my new egcv vsv today from Japan. Fitted it and changed the pipe work back to sequential. Took it out for a spin and the original problem is still there :-( Works perfectly in TTC mode so I guess that means there is no problem with the boost pipes. Any further suggestions? Have you removed, examined and either renewed or replaced to four soft hoses to the pressure reserve tank??????? If not you should do this as the next port of call. Just buying stuff willy nilly is madness, the whole sequential system is easy to diagnose piecemeal, it just takes time and patience. You can even diagnose if the ecu is signalling the VSV's correctly with cheap, simple tools. Quote Link to comment Share on other sites More sharing options...
ashaero Posted October 16, 2016 Author Share Posted October 16, 2016 Hi Shane and Chris I had sort of discounted the hoses as some of the time it works fine. I would have thought (and correct me if I am wrong) that a split or disconnected hose would cause a constant problem. I haven't changed the Iacv vsv yet because I believe that if that one was the problem I would retain the boost pressure from the 1st turbo, where as mine boosts (0.6 bar) up to 4000 rpm and then drops to 0.1. Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 16, 2016 Share Posted October 16, 2016 Intermittent issues are very typical of a leaky hose to the pressure tank, and you need to test the one way valve in the tank, and the tank itself. Quote Link to comment Share on other sites More sharing options...
ashaero Posted October 16, 2016 Author Share Posted October 16, 2016 I wish I lived a bit closer to you Chris as my mechanic skills do not go far past changing a wheel lol. I will have to find a supra specialist around the Essex area. Do you know of anyone competent around the Essex area? Quote Link to comment Share on other sites More sharing options...
Chris Wilson Posted October 16, 2016 Share Posted October 16, 2016 I try not to go beyond the pub these days, but I am absolutely sure there must be competent garages near to you. People think a Supra is a special beast, in the grand scale of modern cars with CAN BUS and a zillion gizmos, they are like an Austin A40 compared to something equivalent from 2016 Quote Link to comment Share on other sites More sharing options...
Sandesupra Posted October 17, 2016 Share Posted October 17, 2016 just read some more about the seq system. it's quite "easy" to diagnose and fix this problem http://my.prostreetonline.com/2014/10/16/how-to-troubleshoot-2jzgte-sequential-turbos/ Have had the same pain in the ass feeling you have now, but hang in there.. suddenly it all makes sence! kinda like a Matrix moment with angels singing and all that;-) just start taking of vacuum hoses one by one and check and re fit. from the Y pipe down to the pressure tank and back upp to the vsv and actuator. this is the only route you need to consentrate on!! check that the actuators opens at correct pressure and stays open then closes at a normal rate. (Could be sticky actuator or vsv that is at fault) dosent have to be all the way broken to mess it up for you.. Quote Link to comment Share on other sites More sharing options...
Sandesupra Posted October 17, 2016 Share Posted October 17, 2016 Quote Link to comment Share on other sites More sharing options...
ashaero Posted October 20, 2016 Author Share Posted October 20, 2016 I will start removing pipes and wait for the singing angels lol. would the actuators operate whilst revving the engine in neutral? Quote Link to comment Share on other sites More sharing options...
Sandesupra Posted October 21, 2016 Share Posted October 21, 2016 I will start removing pipes and wait for the singing angels lol. would the actuators operate whilst revving the engine in neutral? No, you need pressure.. if you have a mittyvac or other vacuum tool.. or try sucking/blowing thru the vacuum hose to the actuator. Pry them open and put you're thumb over the hose to see if it holds vacuum.. you wont know the pressure value, but you will know if it opens closes and holds pressure:) Quote Link to comment Share on other sites More sharing options...
Sandesupra Posted October 21, 2016 Share Posted October 21, 2016 No, you need pressure.. if you have a mittyvac or other vacuum tool.. or try sucking/blowing thru the vacuum hose to the actuator. Pry them open and put you're thumb over the hose to see if it holds vacuum.. you wont know the pressure value, but you will know if it opens closes and holds pressure:) /QUOTE] But since they work fine in ttc, I would start with the hoses. Also make sure they are on the right way! If they are reversed system wont work:) check the vsv with a voltmeter to ensure they are OK according to repair manual. also have a look at the connectors. Quote Link to comment Share on other sites More sharing options...
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