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Old 01-10-2010, 06:27 PM   #1
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Cold Weather Start

A couple of weeks ago my 02 Boxster (71,000 MIles) had a very rough engine idle at start and my check engine light came on a week or so before. I took it my repair place and they replace the PCV vent box valve and breather hose. I picked up the car and it was running fine... However now on very cold starts or if the car sits for a few days I have the same rough idle at start up and it wants to die. Once it warms up a little everything runs great and there is no check engine light on.

I just dont think this rough idle at cold start should be happening.

Any thoughts?


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Old 01-10-2010, 06:42 PM   #2
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Is your maintenance current (spark plugs at 60k)?
1998 Boxster with 7.8 DME, 2005 3.6 liter/325 hp, Variocam Plus, 996 Instrument panel
2001 Boxster original owner. I installed used motor at 89k.
1987 924S. 2002 996TT. PST-2
Owned and repaired Porsches since 1974. Porsche: It's not driving, it's therapy.
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Old 01-10-2010, 06:58 PM   #3
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I'm not sure... I bought the car in Houston with 67,000 miles and the book inside the car only had a stamp for 45,000 mile check. I changed the oil once I got the car and have had no problems until the recent rough idle issue the last month.

I took the car back to the auto repair after there service to say it still have rough idle start in morning but not like it did when I first brought it in. The day they tried to start apparently it didn't happen for them. I seem to notice it more when its sits a few days without start and of I was wondering if the recent below freezing temps had anything to do.

I guess then I may look to have spark plugs changed.
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Old 01-11-2010, 03:42 AM   #4
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I would certainly run a can of Dry Gas through the system. Can't hurt.
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Old 01-12-2010, 07:37 PM   #5
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Could be a lot of things - plugs, O2 sensors, injectors, temp sensors, idle stabilizer, etc. You need to either diag it yourself with a Bentley manual or pay someone to do it for you.

Paul B. Anders / Phoenix, AZ
1970 Porsche 914 / 2003 Porsche Boxster / 2009 Honda Fit Sport Auto
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