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Old 09-16-2009, 01:50 PM   #1
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Default Coldstart - Starts second time only Miata Turbo

I have a Miata Turbo mk2 2000 1.8 with a turbo and Go tech PROX standalone ecu.
It's running a 36-1 trigger wheel with a MAP sensor only (no TPS) .

The problem I am having is that it won't start the first time ( second time ok). I can start it on the key but never the first time from cold. From warm it is ok.
its takes about 5-6 turns when it does start.

Last week I have changed the spark plug and HT leads.
I have discovered that the bottom of spark plug number 1 was covered in oil.
Since changing it, it now runs better but the coldstart problem is still there.

I beleive its one of 3 things:
When they changed the oil it they overfilled it and it went down spark plug number 1.
Or, the rocker cover gasket has gone
Or, the piston Rings has gone.

I have noticed that the oil level is pretty high. So i will need drain that.
The battery is measuring at 12v so i dont know if thats a problem.

I have change the settings relating to the cold maps and start up fuel but it doesn't help.


I wil hapilly send people my map to view it offline if they wish.
Please go to:
http://www.gotech.co.za/software.zip

Another problem I am having is that as I am driving the car hovers around 1500rpm untill the car comes to a complete stop then it comes down to 1000rpm.
I occasionally like to coast downhill so when I press the press the clutch i like it to drop down to idle speed not hover around 1500rpm.


Any thoughts or observations is greatly appreciated.

Last edited by ninja180; 09-16-2009 at 05:18 PM.
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Old 09-16-2009, 01:53 PM   #2
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increase your pulse width a little during cold starts.
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Old 09-16-2009, 05:16 PM   #3
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Here is a snapshot of my fuel settings. Let me know what you think.
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Last edited by ninja180; 09-19-2009 at 04:20 AM.
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Old 09-16-2009, 05:18 PM   #4
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what size injectors do you have?
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Old 09-16-2009, 05:20 PM   #5
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Stock injectors 265cc. I'm looking to fit 440cc but think it should be able to start and idle properly on the stock injectors.
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Old 09-16-2009, 05:25 PM   #6
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try adding 1ms and see what happens. i think you'll wanna be closer to the 4-5-6ms range. I know nothing of that software, I'm judging this based off my MS settings. We inject 3.6ms at 130*F CLT temps, but like 7.5ms at 60*F.
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Old 09-16-2009, 05:35 PM   #7
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Thanks I will try that.

Last edited by ninja180; 09-19-2009 at 04:19 AM.
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Old 09-18-2009, 05:13 PM   #8
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I have bought a new battery it seems to be the same.

I have changed the start fuelling a little higher, to 4-5-6, but that causes it to flood the engine and starts even worse than before. Apparantly lowering it to 1.13ms seems better.

The sparks plugs and it looks black. I guess the fuel is definitely getting there.

My ignition coil charge is 3.06ms it has a ford 4 pack coil. how does this compare with the megasquirt?

By the way does any one know what this menu does?
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