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Registered User
Join Date: Jul 2015
Posts: 2
New 993 Owner: storage issue

Hey all, First time posting with a 993 issue. I've had my '95 coupe car almost a year and its recent come out of a 5 month storage.

A new battery gets installed this morning. The car fires and builds oil pressure to 4 bar, but idles low enough the tach barely registers. Against my better judgment I blip the throttle to try and settle the idle. This causes the car to sputter and die once the tach falls. Now, from searching all the internets, I gather the DME might need to learn the car once a new battery is installed? And if so blipping the throttle could upset this process. Is this likely what I've done, and if so does anyone have experience with this issue?

Thanks for the knowledge sharing
Old 11-06-2017, 02:19 PM
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Registered User
Join Date: Mar 2004
Location: Leesburg, Georgia, USA
Posts: 1,550
I keep my battery disconnected all the time it is in the garage for over 10 years now.
I just connect it back when I feel like taking it out for a drive with no issues.

I'll start checking engine temperature sensor signal. Not sure which one on the 993 but do a search here.
1993 964 C2 still makes me smile
1996 318ti (269k miles)
2011 Silverado for hauling (32k miles)
Old 11-07-2017, 04:59 AM
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Drisump's Avatar
Join Date: Sep 2009
Location: Galiano, BC
Posts: 1,403
How old is the fuel that is in the car and how humid is the environment it is stored in? The modern ethanol fuels have quite a short lifespan and tend to degrade faster in a humid environment. Typically when I store the car I fill the car with fresh 94 (non ethanol), add Stabil (fuel stabilizer) to the tank and I've never had starting or running problems when taking the car out of storage. I know my 993's battery has been disconnected for months at a time with no fundamental running problems. My understanding is that the DME does learn (relearn) for a number of start cycles but starting and idling hasn't been an issue for my car when the battery has been disconnected. Cheers
Old 11-11-2017, 08:01 AM
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initial's Avatar
Join Date: Sep 2007
Location: Ottawa, ON, Canada
Posts: 113
I would start by removing and cleaning the Idle Control Valve with carb cleaner.
95 Carrera 4 Black/Black Coupe, Row M030, Bilstein HD
Past - 89 911 3.2 silver cab
Old 11-16-2017, 04:35 AM
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Don Plumley's Avatar
Join Date: Jun 2001
Location: Geyserville, CA
Posts: 6,821
I would not worry about the throttle blip. While it is possible the ICV is stuck, I’d drive and enjoy it a bit before I start taking it apart.
Don Plumley
96 993 Track Hippo | Spinning Hippo Racing
Old 11-18-2017, 07:51 AM
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