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Moderators: IMOC Moderators, IMOC Committee Members
010on1986 wrote:I found when putting the distributor back in..
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it may seem aligned, but unless the cap is off and you can keep an eye on the rotor arm remaining where it should be,![]()
you can't tell that as the cog engages the cam shaft bevelled gear, it turns the distributor rotor arm out of alignment.
my tuppence worth of useless info.
PW@Woodsport wrote:if the engines cranking then the earths are A1 as thats the biggest draw ampage wise you can place on the engine earths..
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so its not that.
PW@Woodsport wrote:Jeremy,my point was that all of the earths are present and correct,given that the separate earth paths are all doing their job..
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there's a proper spark so the ignition system is earthed,and its injecting fuel,so the ecu earth paths are all correct.
So its not that.
Any sort of misfiring condition is down to bad timing be that incorrect camshaft timing or ignition timing in relation to that cam timing.If both cam timing and distributor are correct then the signal from distributor to ecu becomes suspect.
The only time poor earthing will account for a misfire is if the amplifier doesnt have a good ground,but we have established it has and theres a good strong spark.
greglebon wrote:Looking at the ECU wiring diagrams, and inside the ECU, the E1 and E2 grounding pins are internally connected.
E2 is the ground for the sensors, and this ultimately comes out of the ECU through E1.
E01 and E02 are the ground plane for the high-power transistors, etc and are isolated inside the ECU from the E1 stuff..
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However, they all common at the same ground point on the loom.
This point generally seems to be either the engine block, or inlet manifold..
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(across several Toyota models.
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HTH..
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greglebon wrote:Just had a look at a few diagrams and the ECU I have here..
Cheers, J..
.did not realise that the ECU case is not actually grounded with any of the above circuits.
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.its sole earth is through the mounting bracket.
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So, my setup with ECU fixed to the rear panel in the boot with VELCRO means my case is not earthed at all..
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Even though it all works fine, I'll sort this out..
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I'm not sure exactly at what point on the loom the 3 main grounds are commoned, but it seems to me that joining them as soon after the ECU plug as poss and running a nice meaty cable to the engine block is the optimal..
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Is this how Mr.T does it, or are they joined at the block end?
My diagram does not show this..
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greglebon wrote:Yeh..
.grounding can be fun.
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IMHO, though, you cover all bases by making sure that the engine block is well earthed to the chassis, the chassis is well connected to the battery, and the ECU is well connected to the block..
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(Also, on my conversion, there was the small matter of the metal bracket containing the igniters requiring grounding to the block.
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.but thats another story.
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In fact, you can add igniters-to-block to the above list..
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greglebon wrote:Hmm..I don't get that.
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Assuming all the main grounds are tied together solidly, then they will all be at the same potential..
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Technically, you could ground E2 at the same point on the block as the rest, as long as they're all the same, it matters not..
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E2 is connected to E1 when it enters the ECU case, anyway..
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