Occasional low idle speed - ECTS and/or idle air motor?

2003MercMaraude · 05-12-2008, 12:51 PM

Hi guys, forgive the newb question, but -- 77k mile 1993 SL2, sometimes likes to idle very very low when hot. After a while it will come back up to normal. Should I do both the ECTS and the idle air motor? Where is the idle air motor located on this car?

Thanks

Steve

OnMy4th · 05-29-2009, 03:35 PM

Definitely the ECTS.

And while under the hood,

Check that the vacuum hoses are all solidly on.
Spark plugs changed yet? Ignition wires?

fdryer · 05-29-2009, 04:03 PM

Check the ects first and replace it if its the original. The original ects can cause all sorts of engine/transmission problems if not replaced. The idle air control valve is part of the throttle body and probably works since you say the idle rises eventually. Only a stuck/broken iacv will keep the idle speed at one rpm so its not likely broken. All you need to do is clean the throttle body thoroughly.

05-12-2008, 12:51 PM	#1
2003MercMaraude Member Join Date: May 2008 Location: So. MD Posts: 333	Occasional low idle speed - ECTS and/or idle air motor? Hi guys, forgive the newb question, but -- 77k mile 1993 SL2, sometimes likes to idle very very low when hot. After a while it will come back up to normal. Should I do both the ECTS and the idle air motor? Where is the idle air motor located on this car? Thanks Steve Last edited by 2003MercMaraude; 05-12-2008 at 12:57 PM.

05-29-2009, 03:35 PM	#2
OnMy4th Member Join Date: Jul 2008 Location: UpState NY Posts: 85 2007 ION-2 Quad Coupe 2007 SKY	Re: Occasional low idle speed - ECTS and/or idle air motor? Definitely the ECTS. And while under the hood, Check that the vacuum hoses are all solidly on. Spark plugs changed yet? Ignition wires? ... 2007 ION2 193k 2007 Sky Roadster 37k 2000 SC2 @ 244,000 miles R.I.P. 1995 SL2 sold it at 213,000 miles 1993 SL1 gone X-wife got it in the settlement

05-29-2009, 04:03 PM	#3
fdryer Super Member Join Date: Jan 2006 Location: NYC Posts: 45,661 fdryer's Photos 2003 L-Series 3.0L Sedan	Re: Occasional low idle speed - ECTS and/or idle air motor? Check the ects first and replace it if its the original. The original ects can cause all sorts of engine/transmission problems if not replaced. The idle air control valve is part of the throttle body and probably works since you say the idle rises eventually. Only a stuck/broken iacv will keep the idle speed at one rpm so its not likely broken. All you need to do is clean the throttle body thoroughly. ... VCX NANO

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