15 replies to this topic

[spikyrob]

Right, after spending numerous hours of many weekends scratching ones head and reading almost everything about megajolt and edis system i am still at a loss...

I have fitted a KAD triggerwheel and sensor bracket, sen8d sensor as provided, an edis 4 unit and coil pack and custom plug leads.

i have tried 3 different layouts of the wiring for the coil and edis unit which were found on various sources, i'v altered the bracket so it gets close enough, i'v reversed the polarity of the VR sensor, checked the clearance of the sensor with proper slip gauges, checked the resistance of the plug leads (which are new anyway) and i am still at a loss

when the ignition is at position 2 i get:
+12.48v to the centre pin of the coil pack
+0v on the outer 2 pins on coil pack
+1.5v to both sides of the VR sensor
+12.48v on the PIP
+12.48v to pin 8 on edis (live in)

i have had the plugs out of the engine, earthed and a timing light attatched to them individually and i STILL cannot get a spark, i'v searched through the megajolt guide in FAQ and found nothing to help, i'v also searched the forum and found nothing that i haven't already done.

if someone knows a way of testing the edis unit and/or the coil pack without the car running that would be a great help, other than that i am looking for suggestions as to why i cannot get a spark

if any other information is required for help to be given it will provided ASAP

[dklawson]

If no one replies to this in a timely fashion, send a PM to Miniboo. He is running Megajolt.

[wolfys_mini]

what about the gap from the crank sensor to the trigger wheel?

[spikyrob]

checked the clearance of the sensor with proper engineering class A carbide slip gauges lol

i'v PM'd "The matt" i'll send miniboo a PM in a few minutes

any other "reasonable" ideas welcomed with open arms!

Rob

[Wil_h]

I think the only way to test the coilpack and EDIS is to try a known good one, or put yours on a car that works.

I would guess at the EDIS as there is no spark. For both coils on the coil pack to fail at the same time seems less likely.

[wolfys_mini]

you test the coil pack like you do a coil, just twice.

that would knock that out the equation

[miniboo]

disconnect megajolt and forgety about it for now. get the car working without the MJ.

Then once it is sorted you can connect MJ.

you can test the resistance of the coils.you say you have checked the voltage at position 2. have you defo got teh same votages when you are cranking?

i think theris imay be more than one fault. i had t swap the VR sensor round on my SEN8D to egt it to spark.

start again with the wiring and use the one from here: http://www.autosport...tallation_guide this one defo works of all yur kit(edis coil etc) is good.

not sure if there should be 12 volts on the PIP either

[spikyrob]

the megajolt unit isn't connected, and hasn't been, its still in its box

i set my multimeter to 200 ohms, touched on the inner pin and one of the outer pins of the coil and it came up 0.7 on both sides, which i'm assuming is 0.7 ohms? accross the two outer pins i got 1.4?

Just to let you know, i'm not an electronics whizz, i'm a toolmaker/machinist, i spend most of the day at a machine! but i do know how to check voltages

ok, whilst cranking i get:
~5v on PIP (it fluctuates!?)
+9.5v to +9.8v at centre pin of coil
+0.00v at outer pins
+9.5v to +9.8v at pin 8 (live in)

i also measured the voltage accross pins 5+6 with the connector off it came out at 7.6v AC which if i'm right in thinking is fine because my starter struggles a bit turning the engine over

Rob

[miniboo]

0.7 ohms at the coil is what i measure i think.

where have you connected for the cranking volts? i use the old coil feed.

i will check tonight to see what i have when i crank.

5 volts fluctuating on the PIP as it is a 5volt square wave signal that is sent to the megajolt.

have you got all teh grounds connected?

let me check my kit when i get home.

[mini_turbo_pete]

the megajolt unit isn't connected, and hasn't been, its still in its box

i set my multimeter to 200 ohms, touched on the inner pin and one of the outer pins of the coil and it came up 0.7 on both sides, which i'm assuming is 0.7 ohms? accross the two outer pins i got 1.4?

Just to let you know, i'm not an electronics whizz, i'm a toolmaker/machinist, i spend most of the day at a machine! but i do know how to check voltages

ok, whilst cranking i get:
~5v on PIP (it fluctuates!?)
+9.5v to +9.8v at centre pin of coil
+0.00v at outer pins
+9.5v to +9.8v at pin 8 (live in)

i also measured the voltage accross pins 5+6 with the connector off it came out at 7.6v AC which if i'm right in thinking is fine because my starter struggles a bit turning the engine over

Rob

Just out of curiosity is the coilback bolted down? as they use the bolts to earth the coils.

[luke6040]

Sorry if you have looked at this on the autosport website befor, but this should help:

http://www.autosport...topic.php?t=734

And this is the topic i found that link in:

http://autosportlabs...t=voltages#7706

[spikyrob]

All the grounds? there is only one ground to connect isn't there? (just to run limp mode)

it was bolted down when i did the first test to get normal voltages, it wasn't when i was cranking it, i'm led to believe the edis unit earths the coils so i don't think thats right pete. but i may be proven wrong

i'v had a look on there before (couple of weeks ago) some of the posts wern't there, i will have a more in depth read and another go on sunday and post back here

any other help is still welcome

[mini_turbo_pete]

the earth for the coil packs is taken from the bolts that clamp it to the engine, the earth that the edis unit give are the triggering earths to fire the coils.

You can burn the coils out by trying to use them without them being earthed.

[luke6040]

have you tried asking on autosporst there not as quick at reponding but there a big help lol

[spikyrob]

Okie dokie, here we go..

i'v properly earthed the coil pack using some chunky wire (my apoligies to pete, you were correct) checked all the wires and leads for continuity/resistance, i'm getting all the correct voltages in the correct places, ~3.0v from the sensor, 5v from pip, and a slight fluctuation in voltage on the trigger wires for the coil etc.

i'v tried the sensor both ways with it all as far as i can see correct, i'v checked the wiring around 5-6 times now and can probably recite it as fast as i can count to ten!

But alas no spark

i'm off to the scrappers this afternoon to find another coil pack as me and a friend think that this is the only thing left to blame, i'll post here to let you know how it goes, i'v got the number of a ford fitter to try yet and if that doesn't work then you may find a post with a megajolt kit for sale lol!

Rob