Vacuum line layout for 1989 JDM turbo?

[MA70-3.0GT]

As per the title really, I've been going off USDM photos & diagrams for the vacuum pipe routing on my '89my JDM Supra with 7m-gte lump & while I think it's pretty much there I'd really appreciate if someone has, or could point me in the direction of, some photos or diagrams for the JDM model.

The main difference is the lack of charcoal canister etc on the JDM & the fact that it's RHD so the servo, cruise etc are on opposite sides. Like I say, it's pretty much there but anything that shows the actual JDM setup would be brilliant just to confirm everything...


Cheers, Dan.

[cre]

JDM had the charcoal canister too. EGR is the only thing it didn't have. The ECU was different to make up for the lack of EGR, it pulled timing and added fuel where the EGR system was active on EGR equipped vehicles.

I don't know where to find the diagrams for the JDM engine though. Sorry.

[MA70-3.0GT]

Originally Posted by cre

JDM had the charcoal canister too.

As far as I can tell mine doesn't unless it's hidden, a different shape & plumbed from somewhere else, as the nipple that the vac supply is taken from on the USDM is non-existent (not blanked, just undrilled.). Anyway I think the lines are pretty much there or thereabouts, certainly not wrong enough to be a cause of the no-idle fault anyhow. Can't wait till tomorrow now so I can throw a gallon of juice in it & see if setting the TPS & fitting the recirc. valve back cures anything.

If not then I'll pull the codes again after it's run for a while & see what happens. Oh, and check the ISCV, EFI relay/resistor, rail pressure & cold start injector, plus the other bits I wrote down the other night to look at.

I'll let you know what happens either way, thanks for the help so far.

Cheers, Dan...

[cre]

Ok, looking at some pics I see there is no supporting hardware for the CC... There's no vacuum port, nor is there a CC. I've sent an email to a friend who works for Toyota and I'll let you know what he has to say... maybe he can get the diagrams. The line from the fuel tank needs to be routed somewhere.


EDIT: I'm still waiting to hear back, might not be for a day or so. BUT, while I was walking my dogs it hit me... there are two ports on top of the North American MKIII's (dunno about the models there). One port is for the CC and the other is for the EGR. As we know the JDM has no EGR it is still possible it has the CC, it would be routed differently as it would be located on the opposite side of the bay. I'll let you know when I find out more.

[cre]

They used a much smaller charcoal canister mounted lower down. There was no BVSV used on the Japanese 7M-GTE, the vacuum line went directly to the canister.

He's going to email me the vacuum diagrams he has. Get me your email address and I forward them to you when I get them.




So, since your engine doesn't have the CC connected to the top port, what is connected there?

[cre]

CC does connect to the top of the TB... it's not entirely evident here.

Here are two PDFs (from the Toyota parts catalog): one is for the CC and associated fuel line routing; the other for the general vacuum layout.

http://www.fadingworld.com/CRE/_Auto...ap%20Lines.pdf
http://www.fadingworld.com/CRE/_Auto...%20Diagram.pdf

[MA70-3.0GT]

cre you are a superstar, I'll print those out & go and have a look tomorrow (was going to have a play today as it's nice and sunny for a change, but as sod's law would have it the clutch cable snapped on my bike & by the time I'd bodged a bolt on the end of that & got down there, the place was all locked up!)

I can't honestly recall where the pipe from the top of the TB was routed to but I think it did go to something dangerously similar to that rectangular thing (p/n 77740) on the first diagram.

Bit new to me all this charcoal canister business, I guess it must be to do with evaporative emissions control as it's routed to the tank. (I'm guessing that if pressure builds up in the tank the fumes get vented through the canister/pulled into the manifold or something similar?) all my other cars have been either diesel or non-evap. equipped petrol...
Anyhow, I don't think it's done much good for the last few years on my car as the cap was left off the filler!!! Good job the flap was shut or the fuel tank would be more of a fish tank with the weather here of late.

Thanks again for those diagrams, I'm pretty sure everything's where it should be but now I can be 100% sure.

[cre]

Told you they had a CC...

The CC's not a bad thing at all if you know just how readily gasoline evaporates. I'd rather have every drop going into my engine than just drift away. The only down side to this device is it's size and location... if that's a problem for you fellows here in North America, get a JDM CC or one out of a newer Honda or a Toyota Tercel and mount it in the fender... nice and clean.

[MA70-3.0GT]

And if you're not convinced that petrol evaporates quickly, the guy who did the work on my Supra tells me that last time he ran it (about 2 months ago to shift it out the way of a new mobile office) the gauge was showing half a tank. It's had the cap left off for some reason & it was completely dry till I put a gallon in the other day! Needless to say the cap's screwed on nice & tight now...