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Registered
Join Date: Jul 2006
Location: New Jersey
Posts: 299
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VERY rough idle.
1984 Porsche carrera coupe 3.2 Was at track and car ran great for one session then developed very rough idol....car would stall without applying throttle. Looked for vaccum leaks ...found none. Looked over idle speed control valve ...it humms ** more on this. Checked spark plugs ,coil and battery for correct voltage/resistance etc. OK. I changed DME with another and car won't start at all! ? Back to old DME and same bad symptoms. Now other then something else my question is .....HOW MUCH MOVEMENT SHOULD Idle speed piston have? I see none? Like I said it hums but no up/down movement with hoses off and car "running". I did spary with carb cleaner to see if that would free up piston. Thanks for any suggestions
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08-15-2011, 09:17 AM
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Chain fence eating turbo
Join Date: Dec 2008
Location: Austin, TX
Posts: 9,132
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Cory - turbo'd '87 C3.2 Guards/Blk, 3.4, 7.5:1 CR, 993SS cams, Borg-Warner S366 turbo @ 1.2-1.5 bar, Treadstone full bay IC, 70mm TB, TiAL F46 WG, HKS 1 1/2" BOV, twin 044 pumps, MicroSquirt AMP'd w/GM smart coilpack, Bilstein coilovers, Tramont replica Speedlines (285's rr, 225's frt), Big Reds frt, 993 rr., tower brace, MOMO wheel |
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08-15-2011, 09:23 AM
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Member 911 Anonymous
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Remove the ICV and see if it moves freely when you shake it by a twisting motion. While out clean it until the carb cleaner comes out clear then shoot a bit of silicon based lube, not WD40. Try to position in the middle and replace disconnected see it it idles normal. If so.
Turn off the car the reconnect and restart. if it stalls then check the OHMs of the ICV ( actually check it while it is off for cleaning ).
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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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08-15-2011, 08:25 PM
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Registered
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With the engine not running and the ICV humming the vane makes a quick 3mm move back about every second.
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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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08-15-2011, 08:29 PM
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Marble Grey
1974 Porsche 911 Targa 3.6
