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Volvo B230, Bosch pwm iac - Link g4+ monsoon


Jens_l
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Hello

I have wired up a Link G4+ Monsoon with 60-2 cranktrigger and camsync. Wasted spark coil and sequential fuel injection to my Volvo redblock B230 and i have also wired in the stock iac bosch pwm two wire valve. But i have problem set it up. If i run test mode on the valve it makes noise around 1-40hz over that it's silent. And in my open loop iac table nothing happens between 0-30% over 30% and up the engine goes down in rpm instead of higher. So i have adjusted the throttle body instead to get rpm. And when i try to start the engine at warm temperature it starts and then dies if don't use the throttle for a couple of seconds. After warmup and at idle i have lambda 1

It's also a pain to start cold with e85 even with 400% at crank enrichment and 200% first start crank. But don't know if it's to much. 

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Those valves do go nearly silent at the correct frequency.  Correct frequency is generally 200hz.  You need to set the min clamp to about 15% as that is fully closed, below 15% they start to open again.

those numbers you quote for cold start aren’t unusual for E85.  

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  • 11 months later...

Instead of starting a new thread i ask another question here. How does the iac behave during cranking is it going after the IBP table during cranking also.

Example if i want more or less air from the iac during cranking

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