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B.Edmonds

Cold Start

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Hello all,

My car is near impossible to start from cold without some throttle input. I have asked my tuner to adjust but he hasn't been able to.

it take very little effort to start when cold & once started it idles perfectly. Once warm, it starts perfectly every time on its own.

Wondering if anyone out there can take a look & let me know what I can do. I've never actually done any adjustment so I'd really be flying blind if I try it on my own.

1992 Escort Cosworth. Honda coil on plug, ID1000 injectors. Let me know if I need to provide any other info.

Thanks !

Cosworth March 2019.pclr

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Can you post a log of the start up?  That would help. 

Also, check the idle valve isn't stuck, that's quite common.  To free them up, we take them out, leave them connected and spray some penetrating fluid in, while setting the aux out to PWM test at about 10Hz.

 

At a glance, I would increase your max. clamp in the idle speed settings, and also try a higher idle proportional gain. (although your idle screw might need opening a touch)

 

HTH,

  Richard.

 

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I dont know these engines well but the idle valve aux output is set to 20Hz, that is way lower than typical and I suspect the valve wont control well at all like that.  More typical is 100-300Hz.  Most ford valves seem to be happy around 150Hz.

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Would it be a 2 wire Ford idle valve?

If you need some throttle before it can start, it might mean that you are injecting too much fuel.

Try to use less and see how it goes.

When the engine does not start, did it kick back at all?

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Thanks everyone for your replies. Changed the ISCV htz & no difference.

Further investigation revealed a small vacuum leak. Fixed it. Now have reliable, trouble free cold start.

Thanks as always for the support.

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