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12-30-2020, 02:11 PM
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#1 |
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Board Member
Join Date: Nov 2017
Location: Sacramento
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Microsquirt PWM idle valve wiring
Hey y’all,
So here’s my weird question... When wiring a Volvo 940 Bosch 2-wire IAC to a microsquirt, does one need to include a 1N4001 diode in order to get things to respond in a normal fashion? Ive tried three different IAC’s out of the car and they all respond the same. When using the IAC test mode output in tunerstudio they clatter around and only open from the values 80-95% intermittently...makes tuning WUE on a cold start a real pain. Anyone got any experience with microsquirt and idle valve wiring? Any input would be awesome, Cheers! |
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12-30-2020, 09:26 PM
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#2 |
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Board Member
Join Date: Nov 2017
Location: Sacramento
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solution found! Microsquirt requires a diode (1n4001) to be soldered into the two wires with the banded side to the 12 signal wire. The pwm 2 wire valve now works as it should and cold start tuning is possible!
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12-31-2020, 02:35 AM
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#3 |
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Ronald Culberbone III
Join Date: Feb 2010
Location: Redmond, OR
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Gotta like the "recommended" diode on page 32. I bet this is the reason I could never get the IAC to behave properly.
(no virus)https://www.google.com/url?sa=i&url=...AAAAAdAAAAABAa
__________________
Cult Person. Pissing in your Kool-Aid. Head work: https://forums.turbobricks.com/showthread.php?t=349975 Temp Sender Adapters: https://forums.turbobricks.com/showthread.php?t=348169 |
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01-06-2021, 09:18 AM
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#4 |
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Railspeeder Enthusiast #1
 
Join Date: Dec 2002
Location: mont, AL
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yeah it needs that. I've gotten them to work without it, but they work a lot better with it.
__________________
"They bum rushed them in their own crib, they drank all their beer, they partied with their ladies and they left with the trophy" Now with in-house Dyno tuning! Megasquirt Tuning! |
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01-06-2021, 09:32 AM
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#5 |
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I.M. Weasel
Join Date: Sep 2011
Location: Driving the No Malarkey Bus
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I gave up and plumbed the k- jet thermo valve in. It doesn't seem to work either though, maybe I need to try another one.
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Living life one day at a time. Stopping to smell the oil slick beneath my Volvos. |
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01-10-2021, 09:23 AM
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#6 |
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†John3:16
Join Date: Jan 2009
Location: Fate, Tx
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1n4001 diode. Freq 100-120, duty about 25min 60 max. Use open loop to find the min/max and then set your closed loop accordingly. Make sure to use idle initial value x CLT and idle spark advance as well to help control surges.
__________________
I still love Jesus and He still loves me. MaxxECU Dealer/Tuner WillettRun Automotive, LLC |
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01-10-2021, 03:54 PM
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#7 |
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Board Member
Join Date: Aug 2006
Location: E(Seattle!Vancouver! San Francisco!LA!) Helsinski
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Diode lives easy happy life in connectors rubber boot.
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