Megajolt - Wont Start
Turbo Mini Forums

Well, I got the car back from the paint shop on Friday night ready to wiz down to Castle Combe. I drove it home on Friday night and it was running great. Put it in the garage last night all fine. All I did was give the engine a wipe over as it was full of dust.

I came to the car in the early hours this morning and the bugger wouldn't start. I pulled the plugs leads off and made sure that they are on in the correct order. ( As I had cleaned them last night).

I pulled the carb and made sure it was clean so no dust and bits from the paint job.

I have checked the megajolt has power

I have checked the coil has power.

I noticed that the battery was at just over 12V so I charged it up today as I left it on when I was cleaning the car so the interior light would have been on.

The car turns over and when the engine catches the starter dis-engages like its going to start but it doesn't..

My thinking it to check the spark next, incase the coil has packed up?

Not sure where to start, and a bit pissed that I missed some track action today...

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

first place i'd have started would be as you say check for a spark before any of that other stuff and maybe the mj power too but as you've already done that.

i'm not sure but if you dont have a spark am i right in thinking it could be the coil or edis :s not sure how you'd test em. maybe also check your eaths as mine was weird like that and was due to a bad earth even thought he MJ had power.

How about something like the trigger wheel has moved? Is sounds like it's trying to fire, but it's a bit advanced?

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

bad ignition switch ,not giving 12v after cranking ?

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

Thanks guys going to nip out into the garage and try a couple of things..

So far I have plugged in some of those laser spark plug tester light things as I'm on my own and they are all lighting up as I turn the car over.

I surpose its doesnt show the plug actually sparking?

I'm going to plug the laptop in and check the map......

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

Well did an hour on it. I can't find the fault.
The map looks good.
I tried without the mj connected so in limp mode
I did a compression test as I found Mayo in the oil filler and it did in order of cylinders 1 to 4
9-9-9.5-9.5 all in bar

So god only knows why it ran and then won't run 12 hours later..........

Next stop was to try some new plugs.


Is there a coil test? To make sure its giving enough bang?

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

The spark indicator things only work when there is a spark, they don't light when there isn't a spark.

If you've got sparks, its one of two things. No fuel or as previously suggested, the trigger has moved.


Try some easy start, or even just pouring a little fuel into the carb

Edited by Sprocket on 26th Sep, 2011.

Thanks Colin going to check tomorrow.

The trigger wheel can't move.

Going to also check the switched live

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

The easiest way to fix it would be to dump the megajolt and carb and put EFi on it

Well, I chucked some new plugs in and gave the fuse box a clean as it was full of dust and it fired up first time...

If I get five mins at the weekend I will chuck the old plugs in and see if it starts to check which one it was.

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

at least its al sortd

Done now needs redoing lol

I have had this before. I started the car drove and it onto the trailer. When I came to take it off it wouldn't start.

The plugs had got wet and never recovered.

I wouldn't bother putting the plugs back in, just put them in the bin.

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

We fowled a plug at Avon when I left the choke on for too long.

Wil, Agreed I just wanted to be sure it was that. As i fiddled in the fuse box too. I have never had this before but then the car has been at the paint shop for the last 8 weeks and the filter was in a bad state so it was probably running rich on the way home.

Andy I tried the Wife on the EFI idea as a fix, but she wouldn't buy it after paying out to get the car painted.... boooooo

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

My super charged engine used to eat plugs, i'd cover 1000 miles and need a new set. couldn't find the reason why it used to happen. It was megajolt 3 and the plugs used to look fine with a brownish tint to them. It developed a misfire and the only thing that would sort it would be new plugs. Always fitted NGK 7's

Who's the man in your house Graham?

:)

On 28th Sep, 2011 apbellamy said:
Who's the man in your house Graham?

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

Interstingly mine used to have the same issues. I wne tdown the same route as you however I found earthing the trigger wheel sensor wire sheilding at both ends (EDIS and Trigger wheel end) stopped this problem. This was a few years ago now.

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