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From: Max Demian <max_demian@bigfoot.com>
Newsgroups: alt.home.repair,rec.autos.tech
Subject: Re: What causes idle speed to be low?
Date: Thu, 19 Sep 2024 17:22:59 +0100
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On 19/09/2024 16:48, Snag wrote:
> On 9/18/2024 8:09 PM, Scott Dorsey wrote:
>> Ken Blake  <Ken@OneOfMany.com> wrote:
>>> I have a Mitsubishi Lancer 2003 which has low idle speed.
>>> So low that it stalls unless I keep the gas on the peddle.
>>>
>>> What causes that?
>>
>> You're thinking backwards.  Think about what happens when you're at idle.
>> Something needs to happen to make the mixture more rich, and that 
>> could be
>> done in all kinds of different ways.  Some cars have an extra injector 
>> just
>> for idle, some have software in the ECU that runs the normal injectors 
>> more
>> rich, some have a gadget in the carb that is activated by engine vacuum.

>    A total crock of shit Scott . Idle mix is NOT enriched , if anything 
> it's leaned out . I strongly suspect it's either an IAC or the MAF 
> sensor that's malfunctioning - IAC is most likely , and can USUALLY be 
> cleared up with being cleaned with carb spray . The best thing for him 
> to do is have one of the local parts stores run an OBDC2 scan . Just 
> about every parts store does this for free . Makes sales for them and 
> saves the customer money by not just throwing parts at an undiagnosed 
> problem .

Modern cars are too complicated. The idle used to be controlled by a 
screw that stopped the throttle from closing completely.

-- 
Max Demian