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Old 09-16-2007, 07:02 AM   #1 (permalink)
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Exclamation Occasional stalling on cold start

The wife's 03 XS has occasionally stalled recently on cold start up's within about 5 - 8 seconds of idling (no check engine lights or anything on the dash). A major tune up will be done in the near future (NGK platinum plugs, air filter, fuel filter, PCV valve will be replaced & timing adjusted). New wires (NGK's) were installed less than 2 years ago so I know they are fine & there is a brand new battery in the car. Only quality gas is used in our vehicles (Sunoco or Shell).

The vehicle has 126,000 kms (78,000 miles) on the clock.

Is there anything else I should consider servicing? I am also thinking about having the throttle body cleaned (can anyone tell me a rough price I should pay for this?). Any other suggestions are appreciated.....thanks!
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Old 09-16-2007, 07:43 AM   #2 (permalink)
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Seafoam for the throttle body? About $6! Smooth engine--priceless!

How recently did you replace the battery? Brand new battery = ECU got reset. Sometimes it takes a few starts before the Forester is back to working OK. Mine was absolutely horrible for a short time once after a reset.
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Old 09-16-2007, 09:11 AM   #3 (permalink)
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Seafoam for the throttle body? About $6! Smooth engine--priceless!

How recently did you replace the battery? Brand new battery = ECU got reset. Sometimes it takes a few starts before the Forester is back to working OK. Mine was absolutely horrible for a short time once after a reset.
Thanks bb.....where do I get the Seafoam.....any autoparts store or can I order it here from someone? (I have paypal now lol).

And the battery (Kirkland Signiture from Costco, group 35 - 640 CCA & 7 year warranty) was purchased in March of this year. I kept a close eye on things after it was installed & never had any issues.....so I don't think it's battery related.
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Old 09-16-2007, 09:26 AM   #4 (permalink)
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Thanks bb.....where do I get the Seafoam.....any autoparts store or can I order it here from someone? (I have paypal now lol).

And the battery (Kirkland Signiture from Costco, group 35 - 640 CCA & 7 year warranty) was purchased in March of this year. I kept a close eye on things after it was installed & never had any issues.....so I don't think it's battery related.
Seafoam is a regular item at the autoparts store, and the subject of lots of discussion here--richly illustrated with pictures of its dramatic impact!

My pictures, one of which shows the location in the 2003 where you can inject it, are at Subaru upper engine cleaner. My cloud of smoke was not as dramatic as some of the others.

Nope, I guess itís not the ECU reset. I tried.
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Old 09-16-2007, 09:43 AM   #5 (permalink)
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I appreciate the info bb.....thanks! In addition to what has been already mentioned (tune up & Seafoam)......any other possibilities I should consider?
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Old 09-16-2007, 02:25 PM   #6 (permalink)
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cold start-ups? how cold actually? i'm wondering if you have any sort of clogs (ie: PCV valve, IACV, do our engines have a FIT valve? -- i'm new to Subaru, catalytic converter -- must be hot to function properly).

on my dad's 79(?) Benz 230, it had problems staying on due to a clogged muffler. after sawing the exhaust piping, it stays on fine. running smooth is another story.

any vacuum leaks? this can make it difficult for the IACV (in relation to the ECM) to function correctly.

on a JDM B16A engine (in a 95 Civic Si) with a vacuum leak, my engine would slow die off. this was usually during the first starts of the day. when the IACV finally went bad, the car would buck (or have a real bad idle in neutral) and would quickly die.

if you do the sea foam stuff, make sure any internal gaskets (rubber-types) aren't too worn.

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Old 09-20-2007, 01:58 AM   #7 (permalink)
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cold start-ups? how cold actually? i'm wondering if you have any sort of clogs (ie: PCV valve, IACV, do our engines have a FIT valve? -- i'm new to Subaru, catalytic converter -- must be hot to function properly).

on my dad's 79(?) Benz 230, it had problems staying on due to a clogged muffler. after sawing the exhaust piping, it stays on fine. running smooth is another story.

any vacuum leaks? this can make it difficult for the IACV (in relation to the ECM) to function correctly.

on a JDM B16A engine (in a 95 Civic Si) with a vacuum leak, my engine would slow die off. this was usually during the first starts of the day. when the IACV finally went bad, the car would buck (or have a real bad idle in neutral) and would quickly die.

if you do the sea foam stuff, make sure any internal gaskets (rubber-types) aren't too worn.

_taF
Temps are still fairly warm in these parts during the day......but it's starting to dip in the 40's at night.

No vacuum leak AFAIK.

I have a bunch of tune up parts on order......I will update after they are installed.
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Old 09-20-2007, 08:05 AM   #8 (permalink)
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^
yes, i'd like to know the outcome.

as far as i've had my MY01 (about 2 mo's), i've only noticed on first drive (after first cold start-up) that when i accelerate moderately, the engine has this sputter feeling like it's going to die. i let off the gas or accelerate ever so slowly and it's fine. after it's warmed up, it seems to be better.

always had assumption it might be the intake temperature while engine is still warming itself up. do our intake manifolds have a IAT sensor? also, which intake sensor do we have -- MAP or MAF?

thanks,

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Old 09-20-2007, 03:28 PM   #9 (permalink)
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I'll keep you posted tall....perhaps someone can answer your question in your last thread....cause I am honestly not sure.
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Old 09-20-2007, 03:38 PM   #10 (permalink)
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01 Is a map sensor, you can get Seafoam at Napa, My 01 chokes a bit when cold while accelerating , not always , i take it slow while it warms up and its find.
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Old 09-20-2007, 03:39 PM   #11 (permalink)
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All my EJ's have developed this behavior after the first few yrs of ownership. My 78, 82 or 85 didn't, but starting with MY90 Legacy 2.2 right thru to the current 04XS, cooler weather starts usually have a sputter or stall, then starts smoothly after that.

I never encountered a problem due to this behavior, just needing a 2nd start.
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Old 09-21-2007, 03:31 AM   #12 (permalink)
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We've had morning temps in the low 40's here in Maine a couple times already... My 03 XS foz stalled. I don't know why, but if I just tap the gas and give it a little rev it's fine. It only happens when it's been sitting outside overnight.

I've replaced the fuel filter, plugz, etc in the last 2k miles (60k maintenance). I have a set of plug wires I need to stick on too. PCV was replaced about a year ago and the air filter was cleaned this summer.

Even the new 08 Brokeback makes some funky noises on the cold mornings.... it doesn't stall but the RPM's and engine sound are pretty funky.
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Old 09-21-2007, 05:17 AM   #13 (permalink)
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Sorry I can't help; we've had a 95 outback (2.2L) and my current 99 Foz and have never had such an issue with either. We lived in Boone for a while and it would drop to 0, so that's a fairly cold start. Guess I just wanted to say it doesn't sound normal to me.

So many things it 'might' be, hard to say...
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Old 09-21-2007, 09:21 AM   #14 (permalink)
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Do you have any kind of reader that will tell you what the ECU thinks the engine coolant temp and intake air temp is?
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Old 09-21-2007, 12:31 PM   #15 (permalink)
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Mine typically does it only when it's cold AND when it's damp out...
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