MX5 1.6 engine with megasquirt.

[mhuk]

Hi,

I have a 1.6 engine from a mx5 in my spitfire running mega squirt. It used to run OK. I have changed to a turbo from supercharger. loaded the base map and the car was running on what sounds like 3 cylinders yesterday before dropping dead.

Now it refuses to start and I get several bangs from the exhaust when cranking. The HT leads are on correctly in the correct order. It was air / fuel and a nice fat blue spark but not stating anymore. The plugs are wet with fuel.

Fuel regulator is connected to the manifold vac line OK.

It used to work ok.

Had same issue month ago. I changed sparks for my Corsa and it would be better. Could I have duff plugs? I am running NGK V Power Spark Plug (BKR7E-11) which are meant for turbo mx5... > www.mx5parts.co.uk/sparkplug-bkr7e-mk1225-p-236.html also recommend by mx5nutz forum.

Any advice welcome > Maybe matches are needed?

Cheers

Martin

[Ben Harris]

Is it a homebuilt MegaSquirt? I built one a few years ago (MS1 I think) for my MX5 and one of the mods I had to make was to change the way the coils fired. The original schematic and base map would leave the coils high, when the ignition was on, but engine not started. This resulted in people often burning out the coils and a backfiring when cranking. There was a mod to invert the coil firing so that they would wouldn't get burnt out - this also meant changing the MS config to account for inverted spark.

Just a thought, but is your base map that you're loading correct for the direction of spark, and/or could you have burnt the coils out by mistake while setting it up?

Hope the ramblings above make some kind of sense!

Ben
(ex 480 owner, if you're the same MH I think you are!)

[mhuk]

Hi Ben,

I know who you are! Long long time ago.

It's a PNP MS setup so should work. in fact it did work when running a supercharger last year. I had it running yesterday on new leads and plugs but again it was jumping around like 3 cylinders. It's off to the professional and mapper soon and he should sort it out :-)

Do I miss the 480 scene? Ermmm noo lol

On a sad note catgroom died! Working on his audi and it fell off the jack... Kill him instantly. RIP Groomus!

[logicaluk]

Hi mh have you tryed sideways forum or club triumph there quite a lot of MS knowledge there.
Dan

[mhuk]

Hi,

Yes. Member of both mate. Not posted this issue but had enough so it can go to someone who understands it all.

I will post results when it's running.

Cheers

Martin

[ettorebugatti]

Maybe try rpruen mod


Have you checked the crank sensor/ timing signal?

[mhuk]

lol I never noticed it was you!