1JZGTE problem, rev limiter/ idle

[chris davey]

nope. I didn't think it mattered if it was a jzx81 auto ecu right? Only difference is nuetral start switch and some people have said that the car didn't run right with an auto ecu but others have said it was fine if wired correctly. So could doing a direct swap without changing anything other than ecu's stuff something up?

[GZP51]

ok well i have found the problem and fixed it so now the car starts! there was a wire on the ecu loom that was hanging on by one thread, when i touched it it totally came apart, that would explain the problem when we changed the ecu i must have gragged the wire that was damaged and almost pulled it apart! now the car starts but it idles at 2400 rpms without that bolt in it!!!! the map sensor i am using is off a jzz30 soarer. is THAT what is causing my problems? i really hope not because i don't know where to start looking for a green labelled jza70 map, the label on both of the ones i have here is orange
i have to go to work now so i won't be on... just glad it starts now!
cheers
matt

[GZP51]

umm can anyone tell me if that iscv is porked? i am guessing that that could be the problem as i wound all the screws totally out and it made no difference... then i wound them all IN just to make sure i wasn't a tosser and had wound them the wrong way... madfe it idle a bit higher but nothing when you assume that 2400 is "standard" also the 2400 idle is not what i would call real smooth. so i am hoping that when i get home tonight someone will be able to tell me if i need a new iscv!
cheers
matt

[GZP51]

ok very quick test drive before work, letting it get to operating temp and then stuck my loud foot into it. the rev limiter thingy kicked in at about 4800 and then the idle would not come back below 3000. its like cruise control but more dangerous! 3rd gear "idling" you're doing 55 LOL!
anyways gtg and work/have a think about it
matt

[SL666]

dare say the iscv is porked or the ecu isn't wired up properly to control it.. got the other inlet manifold?

There's a way to test on mitsubishi ones, its basicly testing if its shorted out.. i would assume there is something simular for toyota ones.

My only thoughts with the auto ECU is that an auto ecu might think the car is in first gear, and be doing to retard timing on shift bit.. (although 5,500 is a bit low for it) so i suspect its not the case..

[ndgcpr]

I am running an auto ECU without the N/S switch connected (as i start the car a different way, so i don't need it) And mine runs fine so my guess is that an auto ECU would not cause any issues. Your work on the ISCV could also be wrong. Did you just remove the bolt or did you pipe it back to before the turbo's where is should go? (as thats where my 1G goes). It could be possible that your car thinks there is less air flowing then there acutally is if you piped it wrong which may cause the high idel, although its REALLY high in your case.

This means you now have a rev range of 3000 - 4800rpm thats only 1800 usable range... Thats pretty cool

[chris davey]

I think I have a spare ISCV here if you want to whack it in. I don’t know how to test them but I used this one and it was working fine when I pulled it off the car.

Gav: are you saying that he should put the bolt back in there? If the pipe from the ISCV goes over to the turbo side, the TB is at the correct position, there are no vacuum leaks and the ISCV is wired and working correctly then it should idle right. Still doesn’t sort out the rev limit issue. Do you know anyone with a jza70? Are jza70 maps the same as jza81 or jzx90? I actually thought they were all interchangeable as AFAIK they are all a 2 bar map sensor, 0v = -1, 5v = 1 bar.

[ndgcpr]

got no idea mate. I am just thinking WRT my setup, which is probably an awful way to look at it since i have an AFM. My ISCV goes from my turbo to the intake manafold (bypasses IC pratically but the air it lets in still travels through the AFM) My guess is that if a bolt was in the pipe then the place where that pipe was meant to run would also need a bolt in it? If he pulled the bolt on the ISCV then did he pipe it somewhere or does it just suck from a random place in the engine bay? As that would DEFINATELY cause an issue with my car, but am unsure if it would affect his, however he still has a sensor of some sort up near main intake, I hope that makes sense...

[GZP51]

ok, there is a pipe that comes out of the iscv, it is about 30-32 mm OD or 25 mm ID it is about 100mm long. this hose then connects to a pipe that runs around the back of the block and to the turbo side that is also connected.. everything WAS connected and everything IS connected again. The bolt in question was squished internally inside that hose in between the two hose clamps. does that make sense? it was there to restrict flow and bring my idle down as obviously when you think about it the ISCV or something like that has been kebabarooted all along and that was the best/fastest/bodgiest/fuckhimwhatwillheeverknow way that they could come up with when they did the conversion. what i am hoping is that with the use/borrowing of another iscv that my idling problems will be over provided the map sensor is going to be ok on that loom and that they are in fact interchangeable like chris suggested.
Can i please borrow your spare ISCV chris as i would like to know if that is going to fix the problem. i don't mind purchasing it if it is for sale but the use of it as a diagnostic tool/ try and pray would be great. Hey i have a JZX81 ecu i can swap you for it
any other suggestions people?
cheers
matt

[SL666]

pants.. definately pants..

[GZP51]

underpants or normal pants? if you meant underpants than that could definately be the problem

[SL666]

indeed

any updates?

[GZP51]

not till tonight mate, meeting up with chris after he checks if he still has the spare iscv.. then hopefully swap it there and then we will know

[chris davey]

idle is fixed pulled the bolt out and whacked my ISCV on. 1700rpm. Readjusted throttle stop back to regular and it is now at 850 or so rpm. Much nice

Matt will most likely be on here to let us know if the 5000rpm rev limit is fixed or not soon as he was testing on the way home.

[GZP51]

ok rev limit is still definately there! going to get my o2 sensor changed back to a standard toyota 1J one and get it put in a better position if i can! that should all be happening on tuesday. The car idles beautifully and it definately seems to drive differently as well. Although i think i have a vaccuum leak at the moment due to the different noise my turbos make now... they START to spool normally but then after about 1.5-2 seconds the note of the whistle changes totally and begins to sound like an old school kettle! i will have to track that noise down as it is most annoying and just doesn't sound cool!
The car in general seems to perform better as well and i can't wait to rev the little fucker out for once!
cheers chris for all your help... you are an angel although a fucking ugly one! cheers mate you saved me a real hassle EVERYONE REP CHRIS DAVEY lol
cheers
matt