Megajolt electronic coil pack

freeski-james · Posted: Sat Jan 19, 2019 5:51 pm Post subject: Megajolt electronic coil pack

Need a little help. I have a 3.9 V8 that I have put a Megajolt electronic coil pack on it.
I have doubled check all the voltages on the wiring and they are all fine. All the spark plugs are sparking but it’s not firing.
From what I have discovered it’s not fuelling with this system fitted.
Any ideas what I need to do to get it going?

cynic-al · Posted: Mon Jan 28, 2019 12:49 pm Post subject:

Megajolt only does spark, megasquirt does spark and fuel.

So if you have megajolt fitted and it's not injecting fuel then it's on the cars ECU side. What have you disconnected to fit the megajolt? What ECU is it? They look for certain signals before they will inject fuel. I'm a bit rusty but I think the old flapper system I had wouldn't inject fuel until the air flow flap had opened slightly. There were really good manuals on lr4x4 which i found helpful.

Alternatively your timing is wrong on megajolt, so it's sparking but at the wrong time. The trigger wheel has to be set fairly spot on 5 teeth to the right side of TDC then it can be fine tuned in the software with an offset value

freeski-james · Posted: Sat Feb 16, 2019 3:56 pm Post subject:

I’m pretty sure the negative from the old coil gave the signal to the ECU to inject fuel. So my thought is to join the four negatives from the megajoilt coil packs with resisters in line and join them all up together and put them on the same cable that the negative that the old coil was joined to.

There is fuel up until the injector but no signal to tell the injector to open as there is no smell of in burnt fuel.

cynic-al · Posted: Tue Feb 19, 2019 1:18 pm Post subject:

I would have a look through these manuals and see what your megajolt has replaced depending what version of the efi system you have. If your injectors have the resistor pack your probably on the flapper system.

Flapper
https://forums.lr4x4.com/topic/16466-35-v8-flapp...iagnostic-manual/

Hotwire
https://forums.lr4x4.com/topic/16476-rover-v8-ho...iagnostic-manual/

For the megajolt are you using an EDIS 8 and 2x ford mondeo coil packs or something else? If your using the EDIS 8 it will make the coil packs spark and the megajolt alters the timing. The pip & saw cables gave timing from the edis to the megajolt and communicated how much they needed to deviate from the standard 10 degrees.

On the old flapper EFI there was a box on the side of the dizzy which used to time the fuel injection. I think it did 4 counts for 8 sparks but my memory isn't so good on that. I assume that's what your missing?

There is also an over run relay which shuts off the injectors when the pressure is low in the manifold so I would check that.

Sorry I can't be more helpful it's been a few years!

freeski-james · Posted: Sun Feb 24, 2019 8:15 am Post subject:

Thanks Cynic-al will give that a look and a go. Will report back in time..

cynic-al · Posted: Tue Feb 26, 2019 12:59 pm Post subject:

On the older vee belt engines you have to leave the dizzy in as it drove the oil pump, if yours is one of these maybe you could leave that electronic box in place? From memory the injectors only fire in two banks so I can't imagine the timing is that important?