Megajolt revisited
Turbo Mini Forums

Hello fellas, could anyone throw a little light on the problem i'm having? new engine installed, mj, eids etc all stayed on the car when the previous engine was outed. installed the trigger wheel onto the crank pulley, ensured that no1 piston at tdc lined up the trigger wheel and vr sensor as described on the autolabs website,IE sensor 90 degrees before tdc and nothing. The timing is all to cock and it seems to be firing out of sequence.

I've checked the leads to the coils pack and coil a= 1&4 coils b=2&3 I have a strong spark at the plug so i'm assuming the wiring to the edis and coil is ok.

I would appreciate any advice on this coz it's doing my nut in.
Thanks.
Andy

I am nobody, nobody's perfect. Therefore I am perfect

It sounds like you have the HT leads plugged in the wrong order on the coil pack. Each HT lead terminal on the coilpack has a number, 1 - 4. This refers to cylinder number, so terminal one go to plug one and so on.

Make sure you have them arranged this way and it should be fine.

Edited by Carl S on 3rd Mar, 2010.

I have checked the leads and they are all ok 1 to 2 to 2 etc but still just popping and backfiring.

This is really pissing me off, I might rag the whole lot off and put the dizzy back on.

I am nobody, nobody's perfect. Therefore I am perfect

If everything else stayed on the car and it worked before then the low voltage connections between EDIS and coilpack should still be right and the HT leads should still be right which only leaves the trigger wheel.

From your description it isn't the sensor that must be 90 BTDC, the sensor can be anywhere, what must happen is the missing tooth must be in alignment with the sensor with the engine 90 BTDC on No. 1 (or 4).

The only other thing might be the trigger wheel was way out before and there is a massive offset entered in MJ.

Schrödinger's cat - so which one am I ???

If it is popping and backfiring that suggests that the ignition is massively retarded. I would double check the timing wheel. remember the engine goes clockwise looking at the pulley.

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http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.

You may have blown the coil-pack if you have tested for a spark with all the plugs out & only earthed one plug at a time to test it as you probably would with an old dizzy set-up. :$

You must earth No4 plug when testing No1 & vice-versa & you must earth No3 plug when testing No2 & vice-versa.

I have made an octopus( not eight legged ) with five wires with a crocodile clip at each end, so I connect a clip to each of the four plug bodies & the fifth leg to the body to earth it.

I blew a couple of coil-packs before I became aware of my mistake/s

Make sure the centre of the 9th tooth from the missing tooth is inline with the trigger with No1 at TDC.

Make sure the gap between the trigger wheel & the sensor isn't too big, about .5mm is near enough. . . make sure the trigger wheel is concentric with the crankshaft otherwise you may find the trigger wheel will collide with the sensor so turn the engine by hand to make sure there's always a small gap.

I had a similar problem and it may not be your answer, but try putting the trigger wheel on 180 dgrees round from where you have it and see what happens. When I test for sparks I have a piece of 4mm alloy with 4 holes in it into which I have screwed 4 old plugs(they cut their own thread if you have sized the hole right) Then just earth the plate -I use a jump lead- and see if all 4 are sparking.

Schrödinger's cat - so which one am I ???

Schrödinger's cat - so which one am I ???

[quote=Laurence,3rd Mar, 2010] I have made an octopus( not eight legged ) /quote]

pentapus?

Yes i moved to the darkside

Instagram @jdm_brett

Engine at TDC yes, Sensor at 90 BTDC yes, Missing tooth at TDC do we know?

Coil 1 (the two HT leads nearest the wiring connector) to cylinder 1/4 and coil two (the two HT leads furthest from the wiring connector) to cylinder 2/3

The reason I say make sure the leads are connected in the correct order is because a lot of people think that putting the leads in firing order (1-3-4-2) corrosponding to the terminals on the coilpack, because of the way it is arranged, instead of matching the terminal numbers to the cylinder numbers.

However, if you are certain this is correct, the timing is probably out on the trigger wheel. As others have mentioned how this should be setup, I will not go in to any detail about this.

Hope that helps.

HAve you checked your map, mine some times vanishes over a long winter

Based on my recent experience with setting up the trigger wheel for megasquirt, could the pulley timing mark be in the wrong place for the engine?? I found that mine was 16 teeth out:

http://turbominis.co.uk/forums/index.php?p...id=334028&fr=50

’77 Clubman build thread
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=618189

Siamese 5 port EFI testing
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=611675

Sorted chaps, i'm officially a tool, I set the engine to tdc aligned the sensor with the missing tooth but forgot to offset the trigger wheel, i'm gonna blame it on being distracted but between us is because i'm a dick ; 0

I am nobody, nobody's perfect. Therefore I am perfect

Glad you got it sorted. As with all these things it is easy to get wrong, but you are so sure it is right it confuses you.

http://www.twin-turbo.co.uk
http://www.hillclimbandsprint.co.uk/default.asp

A man without a project is like a like a woman without a shopping list.