rough idle on cold start - Subaru Forester Owners Forum
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post #1 of 31 (permalink) Old 05-12-2007, 11:25 AM Thread Starter
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rough idle on cold start

on cold starts, our forester has a weird (to me) idle characteristic. immediately after start-up, for 10 seconds or more, the rpms jump all over the place. i mean, idle goes way up, then immediately drops way down, then somewhere in between, then way back up, etc.

i dont recall actually seeing the rpms on the tac, but just the sound and feel. i will have to confirm with numbers when i get the chance - i gotta think about checking this in early AM, at a time when i am usually not yet thinking clearly. but i thought i would post up here and see if anyone else is experiencing this too. is it common? could it be that it's just a matter of oil pressure coming up and the engine getting its first lube of the day? why is it so erratic versus just staying high?

i dont get this behavior from my toyota trucks, so its got me mildly concerned. any feedback is greatly appreciated, i dont want a bad situation getting away from me if i can help it. -thnx

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post #2 of 31 (permalink) Old 05-20-2007, 08:03 AM
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I have the same issue on cold starts in the morning, my rpms jump really high then low, the high before they tape out. My belts also make a horrid screeching sound for the first 30 seconds the car is running with the rpm's jumping. Would love to have some notion of what needs fixing before I bring it in.
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post #3 of 31 (permalink) Old 05-20-2007, 06:44 PM
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My Fozzie started doing this a few days ago.... Anyone?

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RIP in the junkyard :(
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post #4 of 31 (permalink) Old 05-20-2007, 06:48 PM
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Are you running any kind of engine management? If not then clean the IAC valve and get a new gasket for it. That should help the cold start issues.
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post #5 of 31 (permalink) Old 05-20-2007, 06:51 PM
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As far as the screching sound check the belt for any wear. If they look good then get some grease stuff to lube the belt.
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post #6 of 31 (permalink) Old 05-21-2007, 09:28 AM
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Yah could be IACV dirty/sticky. Also any vacuum leaks or hoses off on the bottom of the intake tubing might cause this. Check out this EndWrench article.

You may need new belts, or yours may need to be tightened. They sometimes stretch over time. Most suby's (except H6's) do not have an automatic tensioner so it must be adjusted manually.
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post #7 of 31 (permalink) Old 05-21-2007, 10:45 AM
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Another thought, my husband's car used to do this and it was due to 1) dirty fuel injectors and 2) the aftermarket BOV.
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post #8 of 31 (permalink) Old 05-25-2007, 07:25 AM Thread Starter
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my car is a spanking new completely stock car, just turned 5000 miles. this is a warranty issue if anything at all. i have two trucks to wrench on, this car should be turn-key...

btw, i have a couple good sound clips i might post, if i can figure out how to get them off my cell phone.

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Last edited by bkgee; 05-25-2007 at 07:32 AM.
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post #9 of 31 (permalink) Old 05-25-2007, 09:30 AM
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Ah ok; didn't know the year. You might want to check for available ECU reflashes. There's been many a post of various issues like this requiring ECU reflashing on the newer models.
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post #10 of 31 (permalink) Old 05-25-2007, 07:52 PM Thread Starter
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Originally Posted by porcupine73 View Post
Ah ok; didn't know the year. You might want to check for available ECU reflashes. There's been many a post of various issues like this requiring ECU reflashing on the newer models.
thanks porcupine. that sounds like something i really need to look into, here and at the dealer. I was unaware of such issues... i suppose a search will yield some light.

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post #11 of 31 (permalink) Old 07-01-2007, 12:14 PM Thread Starter
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TTT, here is a video of the problem. the sounds level is low, in reality it is very disconcerting! http://www.youtube.com/watch?v=xkxS328w5cE

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post #12 of 31 (permalink) Old 07-01-2007, 03:05 PM
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Try an ECU reset first then see what happens:

http://www.subaruforester.org/vbulle...ad.php?t=15564

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post #13 of 31 (permalink) Old 07-01-2007, 07:03 PM Thread Starter
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thanks Kevin, I will do that this evening, and then make another cold start vid tomorrow AM. in the mean time, here is another cold start vid for the record.

http://www.youtube.com/watch?v=2nublSRTqtw

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Last edited by bkgee; 07-01-2007 at 07:32 PM.
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post #14 of 31 (permalink) Old 07-02-2007, 07:14 AM
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Don't mess around and take it to the dealer. You've got 5,000 miles on it. An ECU reset might fix it, but I'd want to have it on record with Subaru. At 5K f-them, make them take care of your brand new car!

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post #15 of 31 (permalink) Old 07-02-2007, 06:25 PM Thread Starter
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well i reset the ECU last night, and made a recording this AM, problem not solved. time for me to go to the dealer, where i assume i will have to park it overnight so that they can cold start it. i fear that they will get it on one of the mornings that it doesnt crop up (the really rude stuff only happens 1 out of 4 times), or they will screw up by not having their sensors on it when they start it, or whatever. i have plenty of videos to show them now anyway. like you say, the important thing is to get it on official record. my biggest fear is that there is damage that wont be apparent until well after the warranty period. i will report back... again.

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