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Home > Help Needed / General Tech Chat > Got spark, got fuel wont start

Dexter

9 Posts
Member #: 11891
Junior Member

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 .


metroturbo

766 Posts
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North Yorkshire

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


Tom Fenton
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Fearless Tom Fenton, Avon Park 2007 & 2008 class D winner

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On 13th Oct, 2019 metroturbo said:
Doesn't the missing tooth need to pass the sensor at 90 BTDC for it all to work correctly?


Correct chap


On 29th Nov, 2016 madmk1 said:


On 28th Nov, 2016 Rob Gavin said:
I refuse to pay for anything else


Like fuel 😂😂


Dexter

9 Posts
Member #: 11891
Junior Member

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


Dexter

9 Posts
Member #: 11891
Junior Member

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


stevieturbo

3393 Posts
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Northern Ireland

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


theoneeyedlizard

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7157 Posts
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The Boom Boom speaker Police!

Essex

If you still cant 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


metroturbo

766 Posts
Member #: 989
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North Yorkshire

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.


On 13th Oct, 2019 theoneeyedlizard said:
If you still cant get it started, try disconnecting the Megajolt. This will fix timing at 10deg, ruling out any MJ related issues.


theoneeyedlizard

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7157 Posts
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The Boom Boom speaker Police!

Essex

I mean once all of the above is corrected.

In the 13's at last!.. Just


theoneeyedlizard

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7157 Posts
Member #: 1268
The Boom Boom speaker Police!

Essex

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


Dexter

9 Posts
Member #: 11891
Junior Member

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


Dexter

9 Posts
Member #: 11891
Junior Member

Well it runs , its 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 !!!


stevieturbo

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Northern Ireland

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

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