Got spark, got fuel wont start
Turbo Mini Forums

Following a carb rebuild & upping the fuel pressure we now have fuel in the engine, the mega jolt generates a spark that is impressive, but it won't start !!!, valves are rocking on 1 when they should be and the pickup is seeing the edge of the missing tooth at 8 degrees BTDC so with fuel & a spark it should go but it doesn't. Had a few pops & bangs with & there is smoking fuel vapour in the cylinders but that's all. Swapped all the leads round but being a wasted spark 1 & 4, 2 &3 are inter changeable anyway. I have not connected the laptop the box as I am assuming that is should start in limp mode anyway.

Any bright ideas would greatly appreciated .

Doesn't the missing tooth need to pass the sensor at 90° BTDC for it all to work correctly?

Ok I'll give that a go, I've tried everything else

Ok I'll give that a go, I've tried everything else

a spark means little, unless it is at the correct time.

fuel means little, unless it's in the correct quantity...

and of course the third item that's needed is air..

Ensure the basics are correct and it will start.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will

If you still can’t get it started, try disconnecting the Megajolt. This will fix timing at 10deg, ruling out any MJ related issues.

In the 13's at last!.. Just

Not if the sensor is seeing the missing tooth at 8° BTDC. The EDIS assumes the missing tooth is at 90° BTDC and will try to fire at 10° BTDC on that basis. As it stands the spark will actually occur when the piston is well on its downward stroke.

I mean once all of the above is corrected.

In the 13's at last!.. Just

If it was ever running with the trigger wheel in that position, there may be a silly offset value setup in the MJ to compensate.

In the 13's at last!.. Just

I will check the basics yet again, and move the trigger wheel and see what happens.

Well it runs , it’s amazing what happens when the timing is correct, I have to say that the mega jolt setting seems counterintuitive but it runs. Now I have to see if it will move !!!

verify timing is correct as commanded before you get carried away.

Edited by stevieturbo on 1st Nov, 2019.

9.85 @ 145mph
202mph standing mile
speed didn't kill me, but taxation probably will