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Old 11-08-2014, 11:21 AM   #1
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Default IAC valve, does it need coolant?

I used to have a supercharger in my car so the IAC valve was gone. I installed a IAC valve but didnt hook up the coolant hoses through it. The valve worked for 5 minutes and now is shut at 8% dc and wont move. Did I kill it? Does it need to have the coolant hooked up to it? I thought the coolant through the TB was just to prevent condensation, I dont drive this car during winter anyways.
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Old 11-08-2014, 11:36 AM   #2
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Well, now it works again. The IAC valve works properly and then after I tap the gas while at idle the rpms hang at 1300rpms, they wont go back down to 850-900. It must be a megasquirt setting.
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Old 11-08-2014, 01:12 PM   #3
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The coolant line is there to prevent icing. It's heating the throttle body, not cooling it.
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Old 11-08-2014, 01:17 PM   #4
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Do you think maybe its sticking open?
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Old 11-08-2014, 01:27 PM   #5
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I think you need to learn to tune. Do you know what the idle valve test menu is? It would tell you if it's sticking or not...
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Old 11-08-2014, 07:59 PM   #6
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You are right, I need to learn how to tune, I'm actually trying very hard. I will Google test menu and try to figure it out. Thanks for the tip
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Old 11-08-2014, 08:09 PM   #7
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FWIW 8% seems really low. Mine is closed around 20-30% and open before 60%, general reading makes me think mine's about average. It does weird things to the car going much lower than the closed value.
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Old 11-08-2014, 08:33 PM   #8
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When I set the idle to warmup only the iac gauge in ms reads 8. Also when I run it closed loop it reads 17-18 when idling properly and 8 when hitting the gas or coasting. That made me think 8 was closed. I can always plug the air inlet when i think it is sticking and see if the rpms drop.
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Old 11-08-2014, 09:12 PM   #9
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Warmup is a simple x/y for IAC% and CLT. You need to find the open and closed values using test mode then rescale warmup for your car. If 17-18 is your lowest desired idle RPM, that is closed. The idle set screw skews this, leave it be. Mine is closed... Learning open/closed values is a excellent fisrt step towards closed loop idle.

There's no need to go blocking stuff, if the car ran OK on the stock computer you should be fine.
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Old 11-08-2014, 10:17 PM   #10
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The bottom line is: no it doesn't need coolant at all. Unless you're in like 30* and colder weather or something. So either your tune needs work, or your valve is bad.
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Old 11-08-2014, 10:40 PM   #11
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My tune needs work. I'm going to print the whole megasquirt manual at work tomorrow. That should answer all my questions. Hopefully I get it to idle ok by the spring so I can gave it dyno tuned
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