Megajolt worked yesterday, today has stopped working - solved
Turbo Mini Forums

I'm a bit stumped here

It was running fine yesterday I turned it off, came back to it today and there is no spark. I have checked the following.

fuses and connections.

I have confirmed the edis works because it will run in limp mode if I remove the megajolt bridge the +12v cable and the coil power on the molex connector. I am getting tps signals and rev signals when it is connected to the computer during cranking. So am at a bit of a loss as to why it suddenly stopped working overnight.

All that has changed is I disconnected and reconected the battery. Could this have buggered something internally with the megjolt unit?

Any suggestions as to what else to check?

Thanks

Edited by minimole23 on 26th Oct, 2010.

did you confirm all of the details to the MJ unit? you have to write it tot he eprom. can you read the data from the mj?

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

I had written a new ignition map for it and flashed it to the mj that day.

I'll have to look up what eprom means!

Don't get too concerned about the phrase "eprom", it's just the technical description of flash memory on the processor where your map is stored.

As Graham says, can you read the map that you flashed to the MJ back again ???

If not, the write failed so you may have a corrupt map.

Can you read anything from the MJ ???

EDIT - did you disconnect/re-connect the battery before the write was finished or whilst the MJ programme was still open/running on the laptop ???

Edited by Rod S on 14th Sep, 2010.

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

I've had two failures, one the processor just stopped working, needed a new one. the other was a transistor on the fuel pump control, but the thing still worked.

Anything can just fail I guess, you really need a stimulator to check it out.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph

Edited by minimole23 on 14th Sep, 2010.

Very off fault that.....

Have you tried cranking it over whilst looking at the run time data to see what the jolt is reading?

Perhaps a bit late now, but did you still want that MAP I had?

I had laptop issues before I went to germany so wasn't able to send it, but if you're still in need I can send it tonight!

Nick

Mr. Prawn, the friendly Crustacean- slowly making steps towards forced induction.

If you could send the map that would be really appreciated. even just a screen shot so I can input the ignition values by hand

I am booked in on the rolling road thursday.

I will have to have a look tomorrow as to what data I'm getting via the run time screen. As the battery is low on juice!.

just noticed something with your original post, why do you have to "bridge" the 12V? my car will start and run off of the EDIS if I just disconnect the molex plug.

I have all of the the +12V's connected together and then to a single source on my setup, same with the ground.

I run a supercharger and I don't care the TB is on the wrong side.
VEMS + 12 PSI + Liquid Intercooler = Small Bore FUN!

In the 13's at last!.. Just

have you checked the timing, to the MJ

Sorted it.

As the computer got disconnected the map had dissappeared so it was a case of reloding the map to the megajolt

The problems didn't end there. One plug had fouled up, and for some reason it wouldn't fire up on the megajolt. After changing the plugs it ran sweetly. but not before much head scratching and shoving the distributor in there to try to make it work.

Cheers Guys.

Right we have another problem.

The car is really struggling to start, backfiring through the carb mouth and will not rev, then die when it finally does start. I'm totally stumped now. plugs are not fouled up. The problem seems a bit random as yesterday when it was warm it started doing it. it would bog down trying to pick up from idle, then with some careful throttle pumping clear then rev up normally. Now its cold there is no chance of being able to rev it up.

I once again removed the megajolt and got it running on the edis and it runs fine on the edis alone. I'll check all the wiring but after that I really have no idea what it could be.

I've had enough of this to be honest now and may just throw a distributor in for combe and rip the bloody lot out.

If it runs fine on EDIS alone (well, as fine as it can on a fixed 10 degree advance) it really points to either the MJ itself or the associated wiring.

For the MJ itself, also include any external bits like TPS (depending on how you have it configured).

Have you tried logging anything ??? I assume as you said earlier you were having to use a desktop to programme it, the answer is no.... :)

First thing I would do is get a laptop connected so you can do some tests with the car running.

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

sounds a bit like a pickup problem.

Medusa + injection = too much torque for the dyno ..https://youtu.be/qg5o0_tJxYM

I'll investigate the pickup again.

I did get a snippet of the log as I plugged the desktop into it, but it is an indisguishable mash up of jagged lines!

If the pickup doesn't sort it, I'll post a screenshot of the log when cranking / running like a bag of balls!

I have put the distributor back in timed in at 10btdc at 1000rpm as I have run out of time to get it ready for combe, feels flat and down on power compared to megajolt, but at least it works.

Trouble shooting will resume afterwards!

Edited by minimole23 on 24th Sep, 2010.

Have you checked what you use for a trigger to the MJ? If you are using a crank trigger wheel check that.

I've decided to investigate this again today, and guess what. The bugger started first time!

I'm gonna investigate the wiring, if it plays up again I'll get a log.

I did start the car from hot though as I warmed it up on the distributor, so will have investigate further. Intermittent faults are the worst!

Wintersurfers EDIS unit was playing up and wasnt sending a RPM signal to te MJ.

We swapped it for a spare and has been fine since.

When you plug the laptop in, do can you see the map moving with rpm?

In the 13's at last!.. Just

I got a log yesterday when it was working. I'll get one when its not working for comparison.

The thing is, the problem is there or it isn't. I.e one time you can start it and it runs well. The next time you turn the key it will not run well at all then die while coughing out the carb. Could well be the edis module.

Thing is again, it still runs regardless in limp mode.

My mate scrapped a bloody escort yesterday with all the edis stuff on too - Bastard!

Robert was indeed correct, it turned out that the trigger sensor had moved ever so slightly, So would be fine sometimes, then move. Why it would work in limp mode, but not with the megajolt connected is anyones gues. At least it is sorted as intermediate faults are the biggest pain in the arse.

Cheers for the suggestions.