Re: What causes idle speed to be low?

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