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 High Idle :/ 
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Joined: February 12 2013, 8:56 PM
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Post High Idle :/
I have a 1992 rs. When I start the car the idle runs at about 1500-1750 rpm on a cold start. It drops to around 750-1000 rpms when the engine finally warms up.
Anyone have any knowledge as to what might be the problem?

p.s. I just bought the car (my first car) and do not know much on auto mechanics (will be going to school for it shortly and will be learning on the mx in the mean time) so please explain in detail, thank you.


February 12 2013, 11:43 PM
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Post Re: High Idle :/
Most likely your idle adjustment.

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February 13 2013, 1:22 AM
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Post Re: High Idle :/
my ,mx3 and mx6 did that too.

For the three years it was in. I wonder how the idle adjustment gets off like that.

I always though it was the ECU doing it....getting the engine to operating temperature and "getting the juices flowing"

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February 13 2013, 2:52 AM
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Post Re: High Idle :/
also timing can vary idle speeds, including vaccuum leaks, an inproperly torqued intake mani, idle adjustment, and the iac

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February 14 2013, 1:52 PM
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Post Re: High Idle :/
agree with mazdaman I would check your air mixture screw ( ontop of the TB) an start from there.

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September 13 2013, 11:10 AM
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Post Re: High Idle :/
I was under the impression that all mx3s will run high until it hits operating temp. After that it should drop to 700(or w/e the factory setting is) and you can adjust that with the idle screw. Get the car up to temp though first.

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September 13 2013, 6:38 PM
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Post Re: High Idle :/
Yep^^

I would start with the idle screw on the butterfly of the throttle body. check your gap there between the screw and the stop. Then if that is good I would move onto the idle screw on the top of the TB. just take note of how many times you turn it, so you can put it back if that is not the issue.

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September 16 2013, 12:59 PM
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Post Re: High Idle :/
agree, Start with the "easy" stuff to eliminate out. then go to the hard stuff.

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September 16 2013, 1:15 PM
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