e30 m3 not starting

Hi Guys,

You could try to heat the plugs to properly dry them out, either use your kitchen oven or blow torch them and fit them to the car hot and fire up as quickly as possible, or put a new set in there.

GSF were selling them very cheap a few years back, not sure what they currently charge, but you want Bosch X5 DTC.

I would check the resistance of the crank position sensors to ensure they're within spec, should be 550 ohms +/-10%.

Also check the resistance of the cold start sensor (blue) on the coolant rail above the exhaust manifold, cold it should read around 2000 ohms.

Also remove the dizzy cap and rotor arm and clean all contact point with a bit of emery paper or similar if there are no obvious issues with them.

E30 M3 do like to foul the plugs very quickly when the battery is just a little bit low.

-- Make sure your plugs are dry'ish
-- Charge battery or better use a second FULL battery to support cranking
(I would even consider using a second car with a RUNNING engine but you do this at own risk.....)
-- Now comes the trick, when cranking use FULL THROTTLE! Yes FULL throttle with a flooded M3 engine.

The E30 M3 ECU will richen up the mixture a lot when cold and the throttle depressed. Byt pressing the throttle fully down, you will STOP more fuel to be injected.

Just make sure you lift off quick enough when the engine fires up.

Try it, as long as there are no faults with the car it will most likely start.