Do I need a diode across the IAC valve?

For discussing injector selection, manifold modifications, throttle bodies, fuel supply system design and construction, and FIdle valves and IACs.
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m3vxt
MegaSquirt Newbie
Posts: 8
Joined: Thu Apr 29, 2010 2:33 pm

Do I need a diode across the IAC valve?

Post by m3vxt »

Do I still need a diode across the IAC like the normal MS2, or is it part of the IC. Looking at the schmatic for the IC looks as if it has flyback diode within.

I have a 2 wire bosch IAC valve from a 16v MK2 golf gti for referance if anyone knows setting that will work with it?
Microsquirt - MSII Rev 2.89100
Supercharge Mini 1380 A series - TBi suck through eaton M45 supercharger setup
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m3vxt
MegaSquirt Newbie
Posts: 8
Joined: Thu Apr 29, 2010 2:33 pm

Re: Do I need a diode across the IAC valve?

Post by m3vxt »

Well I have added a diode and it now seems to work although only over a short range of about 20-50% seems to be best on about 160hz

At least this will give me something to work with.

Any suggestion of how to spread the effect working band of the IAC?
Microsquirt - MSII Rev 2.89100
Supercharge Mini 1380 A series - TBi suck through eaton M45 supercharger setup
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Matt Cramer
Super Squirter
Posts: 910
Joined: Sat Jul 03, 2004 11:35 am

Re: Do I need a diode across the IAC valve?

Post by Matt Cramer »

A lot of IAC valves only work over a narrow range - not much you can do about it other than replacing it with a different valve, or maybe putting in a stiffer spring.
Matt Cramer at DIY Autotune
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