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<  MegaSquirt Fuel Injection  ~  pwm idle valve Q

PostPosted: Wed Aug 24, 2011 2:34 am
SilverSilverJoined: Tue Nov 24, 2009 1:00 amPosts: 13
Hey everyone,
I was just after some info or input on the subject of pwm idle valve. I have never really had anything to do with them and I am at the part of my MS build that I need to decide if I am going to use one or not. From what I understand the 2.5 has an aux air valve instead but people have issues with these. I decided to build this MS v3 for the standard engine and if all goes well I will build another one for the 24v I am getting ready to fit. I was wondering if there was a better alternative to this aav and if it is fairly straight forward I might aswell change it before I decide on what to do with the MS. My old sprint used to run with a wolf3d ecu and I think that adjusted the ignition for cold starts and it seemed to work fairly well, has MS got this capability?
Thanks for any help

Tim
'85 GTV6


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PostPosted: Wed Aug 24, 2011 10:22 pm
User avatarSite AdminSite AdminJoined: Sun Nov 21, 2004 12:00 pmPosts: 475Location: Seattle, WA, USA
Hi Tim:

I currently have no idle speed control (24valve running MS II) simply because I have not had the time to implement one. Even so, its pretty reaosnable. The car starts immediately (no throttle required) but after it starts I find I need to keep the throttle open wider than normal to maintain a reasonable idle speed.
I think there are 2 options - Idle Air Control valves (using a stepper motor) or a Fast Idle Valve. The latter looks much easier - but I think the IAC (stepper motor) is a better design, & is what I plan on using. Diyautotune.com sells a simple IAC body for installing a IAC valve from a Jeep 4.0l motor:
http://www.diyautotune.com/catalog/cust ... -p-69.html
MS II or III can control the stepper quite easily AFAIK.
My next project 8)



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Michael
1985 GTV6
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PostPosted: Thu Aug 25, 2011 1:23 am
SilverSilverJoined: Tue Nov 24, 2009 1:00 amPosts: 13
Hi michael,
thanks for the reply. That seems to be a pretty good solution for the problem. Would this work any better than the oem idle valve? If so how? sorry about the ignorance but as I said I've never had anything to do with them. I don't want to be changing it for the sake of it but am happy to if it is a worthwhile mod. In any case it seems that I won't have to worry about adding the hardware that is necessary for using a pwm valve.
Cheers
Tim


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PostPosted: Thu Aug 25, 2011 5:00 am
VerdeVerdeJoined: Mon Nov 29, 2004 7:06 pmPosts: 1552
I just use a manual valve in place of the original AAV. It's a lot easier, less expensive, and it's bullet proof.

Greg,
www.hiperformancestore.com
www.okinjectors.com


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PostPosted: Thu Aug 25, 2011 1:01 pm
SilverSilverJoined: Tue Nov 24, 2009 1:00 amPosts: 13
thanks greg,
I started looking at ideas for a manual setup and came across a really good thread on alfabb that u were talking about it there aswell :D not sure which way i'm going to go now. upgrading it to the jeep valve should make it better and hopefully more reliable but putting a manual valve in will get rid of even having to think about reliability.
thanks for both of the suggestions. They were both really helpfull

Tim


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