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Discussion Starter #1
i have been looking at IS engine pics, and i don't see a distributor, like you do in supra 2jzge's. did the 2jzge motor go distributorless when toyota incorporated VVTI into it, or does the IS have a distributor that is hard to see in the pic i have.
i did notice something on the front of one of the cams, that could be a cam position sensor.
 

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In the 1998 brochure, the Supra TT has a distributorless ignition system, but the NA Supra didn't, though it does have VVT-i.

DtEW could probably answer this...
 

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Discussion Starter #3
k, thanks for replying, i will be awaiting Dtew's reply

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Discussion Starter #4
Well Dtew, or anyone that owns one....what's the verdict?
 

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Discussion Starter #6
sweet, thanks i appreciate it, i guess it is very similar to the 2jzgte ignition setup. thanks again

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Only with the use of a mechanical distributor can you have a lesser number of coils than the number of plugs to be fired. In that particular case, only one coil is needed per distributor. But the IS300 is distributorless.

To clarify, the IS300 2JZGE has 6 coils enclosed in 3 housings. Each housing encloses a "primary" coil, which connects to a plug wire to fire a plug away from that coil body, and a "secondary" coil, which fires the plug that the coil body is already sitting on.
 

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Discussion Starter #9
dtew, are you sure about that? the 7mgte has only 3 coils, with a cam position sensor, but it also has a used spark and a waste spark for each cylinder. but i can guarantee it has 3 coils, 6 cylinders and DIS.
just to be clear, this isn't a challenge or flame, just a question, as i am trying to soak up as much about the IS, before i get my 5 speed.

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IS300GTE: Referring back to the service manual, I'm not so certain anymore. There are three coil bodies that are connected to two plugs per. Diagnosing a faulty coil body consists of measuring two sets of resistances, the "primary coil resistance" and the "secondary coil resistance". Originally, I took that to mean that the coil body possessed both a primary coil and a secondary coil. Now that I'm scanning both the illustration and resistance values, I see that the two resistance measurements aren't parallel. And the ignition coil connector has only two prongs. These suggest that the three-coil/waste spark scenario is likely. Now looking through the diagnostics and circuit diagram book, I can confirm that there are only three coils. A cam position sensor feeds into the ECM, which feeds into an igniter, which feeds into the three coils.

Doh!


[This message has been edited by DtEW (edited December 11, 2000).]
 

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Too bad the 7M-GTE needed better head gaskets...
 

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Discussion Starter #13
LOL (DOH) thats cool. like i said, i know nothing about this car, and was just trying to verify. its really cool you have a service manual, how much did that run you?


Originally posted by DtEW:
IS300GTE: Referring back to the service manual, I'm not so certain anymore. There are three coil bodies that are connected to two plugs per. Diagnosing a faulty coil body consists of measuring two sets of resistances, the "primary coil resistance" and the "secondary coil resistance". Originally, I took that to mean that the coil body possessed both a primary coil and a secondary coil. Now that I'm scanning both the illustration and resistance values, I see that the two resistance measurements aren't parallel. And the ignition coil connector has only two prongs. These suggest that the three-coil/waste spark scenario is likely. Now looking through the diagnostics and circuit diagram book, I can confirm that there are only three coils. A cam position sensor feeds into the ECM, which feeds into an igniter, which feeds into the three coils.

Doh!


[This message has been edited by DtEW (edited December 11, 2000).]


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"the gene pool could
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Discussion Starter #14
Scott is correct! 72lb/torque would have done alot better for that car. they should have had a recall on the fiber gaskets also, but oh well.

Originally posted by HIBBoyScott:
Actually, all it needed was to be torqued down more.


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Discussion Starter #15
Hey Dtew, where is the cam position sensor located at anyways? tia
 

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BTW - I had a 4 cyl motorcycle with two coils, and no "distributor".

Basically it fired two plugs at once, although one of them was triggering a piston which was not ready for the "power stroke", but it didn't really hurt anything (perhaps a bit of extra wear on the spark plugs).
 

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The cam position sensor reads off the intake (VVTi) camshaft right between cylinder 5 and 6. You should see it right next to the fuel rail.
 

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Discussion Starter #18
k, once i can get a hold of a car to get some pics, and look under the hood, i will check, thank you.
 
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