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Thread: Weird Idle problem on a cold start.

  1. #1
    Join Date
    Apr 2001
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    Argyle,Texas
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    6,455
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    95 M3 S/C

    Weird Idle problem on a cold start.

    I got the car in april this year so I hav'nt drove it in cold weather yet. Well its gettin cold in the morings, when i start the car 92 318is. The idle will go up to 1000 then down the 350 an bounce around in there for awhile then it settles around 600 which seems to low. When it drops to 350 it runs ruff. Again this is only a cold start problem not warm or hot. I have a Cold Air intake with heat shield if that matters.
    2011 Toyota Highlander (wife)
    2002 X5 4.6is - 225,000 (Dead)
    2001 Toyota 4runner
    1995 S/C M3 - 99,000 miles
    1995 525i - 244,000 miles (sold)
    1999 528iT Touring - 175,000 (sold)
    1992 318is - 325,000 miles (Sold)
    1986 325e - 180,000 (sold)

  2. #2
    Join Date
    Jun 2001
    Location
    Portsmouth UK
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    494
    My Cars
    BMW 325iSE 1993

    Don't Worry

    I have the sam problem on my 93 325iSE and when I took it to the dealer he ran a load of checks and said that he could not find any fault and that it was nothing to worry about ???

    When I start mine on a cold day the revs shoot up to about 2 - 2,1/2 and then bounce around between 1 and 1,1/2 but afther that it is fine although I do seem to get some flat spots in 1st and 3rd gear until she has warmed up.

    I know that this is probably not a great help to you but I thought that I would let you know that you are not alone.

    Cheers. :

    325iSE
    Portsmouth. UK.
    "I have not lost my mind.....it's backed up on disk somewhere"
    If Utopia is just a state of mind, keep on dreaming.
    Born Lazy and probably tooo lazy to die!!!

  3. #3
    Join Date
    May 2001
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    Chicagoland, IL
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    2003 Mitsu Lancer Evo VIII, 2005 Chevy Z51 C6
    The hunting idle at cold start is normal. Dropping to 350 rpm is not normal though. Mine usually holds around 1400rpm and as it gets warmer drops to 800, hunts between 800 and 1000, then once warm enough, settles at around 600rpm as normal. 350 would kill the engine, I would think. You sure it's hitting 350?
    Rel
    1999 Titanium Silver ///M3 (SOLD)
    Conforti Intake, Shark Injector, AA Gen 3 Exhaust, AA Track Pipe, Koni SAs, H&R OE Sports, TC Kline RSMs, X-Brace, UUC TMEs, ZKWs w/HID, DDE Gen IV, Clears, NIKEN pedals, Pioneer DEH-P7000, Valentine One

    2003 Tarmac Black Mitsubishi Lancer Evolution VIII
    Borla cat-back, AEM SRI, GReddy TT, Sony CDX-CA810X

    2005 Lemans Blue Chevrolet Z51 Corvette

  4. #4
    Join Date
    Apr 2001
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    Argyle,Texas
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    95 M3 S/C
    Yah around 350 cuz it wants to die when it drops that low it barely runs. And also it does have flat spots or dead spots while driving when its cold I just take it easy till it warms up.
    2011 Toyota Highlander (wife)
    2002 X5 4.6is - 225,000 (Dead)
    2001 Toyota 4runner
    1995 S/C M3 - 99,000 miles
    1995 525i - 244,000 miles (sold)
    1999 528iT Touring - 175,000 (sold)
    1992 318is - 325,000 miles (Sold)
    1986 325e - 180,000 (sold)

  5. #5
    Join Date
    May 2001
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    Chicagoland, IL
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    2003 Mitsu Lancer Evo VIII, 2005 Chevy Z51 C6
    Hmmm, I do think 350rpm is too low. I wonder if anyone else can confirm this.
    Rel
    1999 Titanium Silver ///M3 (SOLD)
    Conforti Intake, Shark Injector, AA Gen 3 Exhaust, AA Track Pipe, Koni SAs, H&R OE Sports, TC Kline RSMs, X-Brace, UUC TMEs, ZKWs w/HID, DDE Gen IV, Clears, NIKEN pedals, Pioneer DEH-P7000, Valentine One

    2003 Tarmac Black Mitsubishi Lancer Evolution VIII
    Borla cat-back, AEM SRI, GReddy TT, Sony CDX-CA810X

    2005 Lemans Blue Chevrolet Z51 Corvette

  6. #6
    Join Date
    Mar 2001
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    So Cal
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    Hellrot
    I can confirm, my car does the same exact thing (95 325i) if I dont warm the car it drops to ~300-350 bouces up to 1500rpm and down to 300ish and over 1800 and stalls when it comes back down. Had over 3 mechanics check the car, i changed the ICV, O2 sensor, coils, fuel pressure regulator, plugs, checked intake manifold for cracks and even for a vac leak, also got the DME checked out along with the timing, and still no cure.
    But when i warm the car until temp gauge reaches 1/2 mark car idles fine.
    Based on my experience i think there is some component that checks the Outside temp and the amount of air that the engine is getting and accordingly adjusts the amount of air and fuel,
    ( i do not know the name or the location of this part) however, I do think this part is malfunctioning thus "forgetting" the right amount of mixture of fuel and air in the mornings and as the car warms up a little the DME re-teaches this component or remembers and idles fine, yet, forgetting the next cold morning.
    Sorry couldnt help, but any ideas out there?

  7. #7
    Join Date
    Mar 2001
    Location
    The Aloha State
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    663
    My 2 pennies:

    Call the dealer to see if they have a cold start DME fix for your model year car.

    BTW, what weight oil and type of spark plugs are you using?
    Last edited by Lopaka; 09-30-2001 at 03:39 AM.

    1993 325i - Jim C chip, ECIS CAIS, BMP Intake, K&N, fan delete.
    *SOLD* 95///M3 - Engine/Exhaust: Underdrive Pulley, Port & Polished Intake, ECIS Heat Shield, BMP Intake, 9" K&N Filter Charger

  8. #8
    Join Date
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    2003 Mitsu Lancer Evo VIII, 2005 Chevy Z51 C6
    Right, I remember Jon Caldito mentioning a cold start related problem that was addressed with a later software revision. Unfortunately, I don't remember which model years and which models... hopefully if he catches this thread he can comment.
    Rel
    1999 Titanium Silver ///M3 (SOLD)
    Conforti Intake, Shark Injector, AA Gen 3 Exhaust, AA Track Pipe, Koni SAs, H&R OE Sports, TC Kline RSMs, X-Brace, UUC TMEs, ZKWs w/HID, DDE Gen IV, Clears, NIKEN pedals, Pioneer DEH-P7000, Valentine One

    2003 Tarmac Black Mitsubishi Lancer Evolution VIII
    Borla cat-back, AEM SRI, GReddy TT, Sony CDX-CA810X

    2005 Lemans Blue Chevrolet Z51 Corvette

  9. #9
    Join Date
    Apr 2001
    Location
    Argyle,Texas
    Posts
    6,455
    My Cars
    95 M3 S/C
    I'm using the factory plugs the ones that have dual tips on them forgot what their called. Oil I'm using Castrol GTX 20W-50.
    2011 Toyota Highlander (wife)
    2002 X5 4.6is - 225,000 (Dead)
    2001 Toyota 4runner
    1995 S/C M3 - 99,000 miles
    1995 525i - 244,000 miles (sold)
    1999 528iT Touring - 175,000 (sold)
    1992 318is - 325,000 miles (Sold)
    1986 325e - 180,000 (sold)

  10. #10
    Join Date
    Mar 2001
    Location
    The Aloha State
    Posts
    663
    Originally posted by Austin
    I'm using the factory plugs the ones that have dual tips on them forgot what their called. Oil I'm using Castrol GTX 20W-50.
    When was the last time you changed the plugs? You could switch to a Bosch + 4 which may help w/ a rough idle. Also, you could switch to a 0-50 weight type of oil. But, I'd try the DME software if any (no harm in calling the $tealer). I don't remember which years/models they had a fix for.

    1993 325i - Jim C chip, ECIS CAIS, BMP Intake, K&N, fan delete.
    *SOLD* 95///M3 - Engine/Exhaust: Underdrive Pulley, Port & Polished Intake, ECIS Heat Shield, BMP Intake, 9" K&N Filter Charger

  11. #11
    Join Date
    Jul 2001
    Posts
    29
    Mine did that the other morning also. I have a 93 325 auto and I put it in Netural and back and it seemed fine. And like you it only did it when it was cold. Funny thing is it hasnt done it after that.

    This may totally be unrelated but I was wondering when i get my water pump changed next month and they replace the thermistat if that would help....

  12. #12
    Join Date
    Sep 2001
    Location
    Boston, Ma
    Posts
    430
    My VW GTi VR6 used to do the same exact thing until one day I brought the car in for an oil change. I dont know what they did to it at the dealer but after that it would start fine. It was a good car but just do damn small.
    1997 328i/4 Sport Pkg.
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