Idle Speed control valve
#1
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Hey everybody, so I just installed Megasquirt ms3pro into my 92' Miata and I am not quite sure if the idle speed control valve, just below the throttle body, has any use to me now that I am running a turbo setup. I understand that idle is controlled primarily with megasquirt by coolant temp, timing, and the air temperature sensor. I just don't know if the idle speed control valve has a role now that I have megasquirt. Anyone know?
Also I have the original throttle body from 92' and I understand that if you are running turbo with a stock ecu, then you need to route the iscv to your intercooler piping.
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#5
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If I may, I will piggy back on Jgilby's thread, as I have a similar idle question. My car is a '93, with Megasquirt 2 , and FM 2 turbo system, and currently no IACV, just running what can be set up without it. I am also a laptop dunce, so rely on help from a friend who is a tuner. My question: to return to IACV functioning,( as I have a 1999 engine with the valve installed, but no wiring or harness plug), can I try and locate the original 2 wires that the stock '93 had for the earlier ISCV control, and use them with a new harness plug to send the signal to the MSG. from the IACV? I think the MSG.2 for my 1993 harness should have the pins in the correct location, if I can find the wires back in the stock harness, which was trimmed back by the PO. If I understand things, then my tuner buddy can open the MGS. and turn on the IACV function, yes? If that is correct, I can do the wiring, etc. I had previously thought the idle control was only needed in the first minute, or so, till the engine warmed up a little, and would live with having to keep the car running with my foot, but would really like having a more stock-like idle drivability. From the above advice, it seems like that may be the case. Thanks!
#7
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Since then its a static idle, that cant compensate for varying loads, what is going to keep the car running when the idle loads increase? headlights on, A/C on etc... more load the car wont idle well or die when you put more load on it.
#8
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Yes. Look at the base map for the 99-2000 on DIY’s page for config info.
If I may, I will piggy back on Jgilby's thread, as I have a similar idle question. My car is a '93, with Megasquirt 2 , and FM 2 turbo system, and currently no IACV, just running what can be set up without it. I am also a laptop dunce, so rely on help from a friend who is a tuner. My question: to return to IACV functioning,( as I have a 1999 engine with the valve installed, but no wiring or harness plug), can I try and locate the original 2 wires that the stock '93 had for the earlier ISCV control, and use them with a new harness plug to send the signal to the MSG. from the IACV? I think the MSG.2 for my 1993 harness should have the pins in the correct location, if I can find the wires back in the stock harness, which was trimmed back by the PO. If I understand things, then my tuner buddy can open the MGS. and turn on the IACV function, yes? If that is correct, I can do the wiring, etc. I had previously thought the idle control was only needed in the first minute, or so, till the engine warmed up a little, and would live with having to keep the car running with my foot, but would really like having a more stock-like idle drivability. From the above advice, it seems like that may be the case. Thanks!
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Seangh
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05-30-2017 02:38 AM