Massive problem! Coilpack / EDIS?

[miniJJ]

Hi,

My megajolt's been running great since January, all of a sudden this has started happening, the car is complely undrivable!



Checked and fuelling isn't the issue. I disconnected the MJ and let it run in limp home mode, and it still does it, as you can see the severity is intermittent. I made sure my VR sensor and trigger wheel are securly mounted and they are not vibrating throught he rev range. Also, the coil and edis are still getting power whilst this happens. I think this is a coilpack or edis issue. Could it also be HT leads?

Like I said, this just suddenly happened after months of trouble free running, I believe the coilpack or edis is to blame, which do you think is the culprit?

What do you think? Please help as my car is just about to be insured and driven for the first time!

Thanks in advance, JJ

[NITROPIXIE]

Hi jj

Not seen this too much myself but it does look electrical.

Do you have a timing light to hand?? Can you aim it at the trigger wheel/timing marks with the mjlj disconnected and confirm the timing is at a rock steady 10 degrees advance.

Otherwise i think it may be a loose connection or possibly really bad interference from somewhere or possibly a really loose triggerwheel.

Any chance of getting some more info about you setup?? possibly pics of relevant parts.

Can you measure voltage at the coil pack with the engine running on an AC setting. It should be constant, if it varies it could signify a loose connection.

[sunray]

Has the diode trick been done with the two diodes and the zener diode to make your tach work? Is it possible that some of the voltage between the two coils is making is past the bias of the diodes?

[miniJJ]

Hi,

My trigger wheel is welded to my pulley and nicely balanced, so it's not moving. Mr sensor bracket is nice and sturdy. Like I say, the setup has worked fine since January so I think it's an electrical issue.

The rev counter is reading correctly, ruinning off the MJ tach out pin. (the rev copunter was from a ECU'd injection mini)

I have a timing light but no idea how to use it, I'll have a look later. I measured the voltage going to the coil and edis and it was 13 / 14v with the engine running.

I found a similar issue on here and it was said to be a coil failure, it was arcing inside. I need to get the parts today for it, so I need to know what I need to fix it.

Thanks, JJ

[miniJJ]

Sorted, combination of faulty ht lead(s?) causing the misfire and the vr sensor appeared to have moved out about a mm further out from the trigger wheel, causing hesitation on acceleration.

Thanks, JJ

[rich_2137]

Hi there

i have the same rev counter as you how did you wire it up to work as mine just sits there!