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Registered User
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Stalling while driving
I have a an '85 3.2L that had been running perfectly...Pulled the car out after sitting for about a month and while driving it seems to want to stall, tach drops to near zero then pops right back up. It did this about 10 times during a 20 mile ride.
Starts right up, idles well, no surge, seems to only happen between 3-5k rmp. Could this be a faulty DME? Bad coil? Distributor cap? |
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05-31-2015, 07:07 PM
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Member 911 Anonymous
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Sounds like a massive vacuum leak.
Idles well? after she is warm a bit, pull over, leave the car on and remove oil the cap, idle should drop, if not, you may have a vacuum leak. Jim
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'85 Carrera Targa Factory Marble Grey/Black * Turbo Tail * 930 Steering Wheel* Sport Seats * 17" Fuchs (r) * 3.4 * 964 Cams * 915 * LSD * Factory SS * Turbo Tie Rods * Bilsteins * Euro Pre-Muff * SW Chip on 4K DME * NGK * Sienes GSK * Targa Body Brace PCA/POC |
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05-31-2015, 07:22 PM
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Registered User
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Does this only happen once the car is warmed up? My vintage coil would get heat soaked and do the same thing. Only has issues on hot days over 85 degrees.
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1976 911S MidYear Fever is alive and well. |
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05-31-2015, 07:30 PM
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Registered User
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started after the car got to temp
Just to be clear it never actually fully stalled Just drops and goes right back, all while at highway speeds |
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05-31-2015, 07:49 PM
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Registered
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Are you saying the engine keeps turning at approximately the same speed while the tachometer and power cuts out?
This would point either towards the flywheel speed sensor becoming intermittent or the DME loosing power completely because of the ignition switch or alarm unit etc. Next time it happens tap or wiggle the ignition key to see if it makes a difference. Ingo
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1974 Targa 3.6, 2001 C4 (sold), 2019 GT3RS, 2000 ML430 I repair/rebuild Bosch CDI Boxes and Porsche Motronic DMEs Porsche "Hammer" or Porsche PST2, PIWIS III - I can help!! How about a NoBadDays DualChip for 964 or '95 993 |
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06-01-2015, 06:21 AM
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Registered User
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No, the engine speed drops
Feels like an intermittent fuel cut of I bet it's the DME I'm starting there |
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06-01-2015, 12:42 PM
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Registered
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I had a similar stalling issue. Tach would drop. It was the electronic part of the ignition switch. My car would always restart immediately as the connections in the switch would be reset by turning the key off then on. I had another similar stall that turned out to be the large plug at the fire wall that connects to the ignition switch. Intermittently would short out and stall. Worth considering both these possibilities ..
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Dave 1985 Factory Turbo-Look Coupe 2011 Cayman S 2012 Audi S4 Last edited by Hoss911sc; 06-01-2015 at 01:03 PM.. Reason: spelling correction |
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06-01-2015, 01:02 PM
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Registered User
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Cool will keep all of these tips handy as I proceed
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06-01-2015, 03:24 PM
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Marble Grey
1976 Porsche 911S
1974 Porsche 911 Targa 3.6
