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Thread: Evo 9 idle problems

  1. #21
    Evo Specialist jamesinger's Avatar
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    Re: Evo 9 idle problems

    I have never NOT had issues with my idle on my EVO since I got it.Â* I think this is one reason why people say that buying a Mitsubishi (especially a DSM) makes people mechanics...Â* I have had highly modified Nissans and Hondas and I have never had to deal with the bizarre stuff I have had to deal with owning an EVO.

    Regardless, there are two main things I have done with the dipping idle.Â* 1. is to have my tuner adjust my tune a bit.Â* This sent my idle to 1100, which is OK but not my desired idle but with EVOs, I guess you just have to pray to the gods of old to hope your idle is consistent.Â* One summer when I first had my EVO, if I turned on my AC, every time I would pull up to a light, my idle would drop and my car would die.Â* Scot Gray does my tuning and he just did a couple magic wand waves and everything was fine.

    Also, I have adjusted the idle screw thingy.


    [pics taken from Road Race Engineering].

    I still have my idle drop off now and again but it usually only does it when I pop in the clutch unexpectedly in traffic...like if someone in a Prius randomly slams on their brakes or something... but it never dies.Â* In any case, my EVO NEVERRRRR has a consistent idle.Â* Sometimes, I will wake up and drive 20 miles to work with my car idling all buttery at 900-1k...then I will go to lunch and the shit is at like 1500 to and from lunch...then I will drive home and it will be fine again but around 1100 all the way home.Â* I obviously have OCD and this bugs me but it seems unfixable, so you just have to learn to check your EGR, check other vacum hoses if your vac reading it off the norm, then I would check the idle screw and play with it before fiddling with more complicated stuff like the MAF or your TPS or any other random stuff people will tell you.

    I try to work on my EVO as much as possible and this is still a struggle for me, with my old engine and my new engine, with my old TPS and my new TPS and all other stuff checked and gone over x100000.

    Basically, what I do is:

    1.Â* Go home, park, disconnect the battery.
    2.Â* Relax for a while, do whatever while the car cools, then check all hoses (especially EGR) and then reconnect the battery for the next time I drive.
    3.Â* The next time I drive, I bring a stubby phillips head screwdriver and if the problem is still there, I will stop in random parking lots and tighten the screw or loosen the screw to get the desired idle.Â* I play with this by turning 1/4 turn at a time but you can really feel it.
    4.Â* If this doesn't help, I will usually throw in the towel and seek help at RRE.

    Last, the dip in idle has been on my EVO since I got it and it never goes away but you can mess around so it only happens here and there, and you can make it so it does not make your car die.Â* That is my experience anyways...

  2. #22
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    Re: Evo 9 idle problems

    Like everyone else it seems like my car is experiencing these problems now too. Did the failing iac throw a dtc for anyone? I scanned the car last night but I didn't get anything. I checked my throttle body and it was clean and I've cleaned my air filter and my vacuum lines look good. I just started having this idle problem on Saturday.
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  3. #23
    i have been having the same issue.. at first my front O2 went bad so the drivability went to crap really fast. But the ecu threw a p0505 (I think) and it was the front O2 was dead. replace it and things were good. but then it happen again.. I will come to a stop and the idle dips.. i have done the scantool SAS and fixed the idle with the BISS. that cleared up a few things and the idle went back to normal.. .but now I still have issues where the car will die when I make turns sometimes with the clutch all the way in. (Shit is bad because u lose power steering.. ) Also... i have notice that when the car is all the way warm my idle voltage will be as low as 13.5/13/6... I think this may have to do with my issue. My battery has been moved to the back.. and i have a brand new alternator ... So any help or idea on what is going on is more than welcome...
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  4. #24
    i have seen countless amount of evos that have issues with warm start or even cold start idle, might be linked to the tune. i personally have never had any idle issues with my car with s2's with or without the a/c on or due to any cold or warm start ups.

  5. #25
    Canyon Racer one4's Avatar
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    Could be crappy injectors ...

  6. #26
    Quote Originally Posted by one4 View Post
    Could be crappy injectors ...
    i hope that's not whats wrong with my evo =(
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  7. #27
    Evo Specialist HMatt's Avatar
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  8. #28
    Having same issue too.

  9. #29
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    Quote Originally Posted by vicariousthrill View Post
    Having same issue too.
    Yes I am too I tried cleaning my maf today to see if that would fix the problem I'm sick of it lol
    IG: Lorenzo_Feal

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