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That's fond- just deglaze
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3.2 died constantly when shifting into neutral!
The Vehicle- 132K mile '86 3.2 Carrera Coupe- New fuel filter, cap & rotor, plus SW Chip, ECM, plugs, O2 sensor within the last 4 years. Always idled at 880 when sitting (albeit with some tiny +/-25 rpm fluctuations)
The Issue- Now out after Winter storage, she wanted to constantly stall when coming to a stop or slowing. Push the clutch in & take it out of second while on the brakes and the engine would fall to under 300 rpm and then die. She would always start immediately again (even while coasting). All possible vac leak problem areas either new or in good shape- including the oil breather tube adapter and that wacky brass/breather thingy (#93011032803). Checked the actual vacuum using the Heidi & Franny's Garage recommended left side fuel pressure regulator splice with a vac gauge. Result- More suction than a Dyson on crack. Through questionable process of elimination, I then cleaned the ICV. While that seemed to help, it really didn't change the overall issue. ICV did appear to be working (it did hum with the ignition on and obviously held an idle while sitting). Checking the records, the ICV was last changed in 1996, so it was now 22 years old. Based on other posts, I went ahead and bought a brand new Porsche ICV #930-606-161-00 from our host. The swap took 10 minutes. I now have a new car. Seriously- the change in drivability is dramatic. Smooth, even and wonderful. Rock solid hold at 880 when slowing down and shifting into neutral. She even sounds better. Hell, I'm convinced the ICV swap also took 10 lbs. off my weight and I have more hair. I couldn't be happier. 
Last edited by Missed Approach; 05-11-2018 at 04:46 PM.. |
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05-10-2018, 05:49 PM
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Guest
Posts: n/a
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Congrats on solving the problem.
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05-10-2018, 09:15 PM
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The 9 Store
Join Date: Dec 2009
Location: Wilmington, DE
Posts: 5,316
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pelicans price is very good. My wholesale price is $305
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All used parts sold as is. |
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05-11-2018, 08:32 AM
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Registered
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Thumbs up for posting a problem and your solution! Thanks.
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1986 Carrera Coupe - 1987 W124 300E - 1999 Land Cruiser 100 - 2021 GLA250 |
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05-11-2018, 11:06 AM
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Still here
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Congrats !
The electronically controlled idle device such as the ICV in the Motronic is a great improvement over the previous designs. |
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05-11-2018, 12:24 PM
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Registered
Join Date: May 2018
Posts: 12
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how is icv unit holding up? any stalling issues appearing? if not, great!
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08-12-2018, 10:57 PM
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83 911 Production Cab #10
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Quote:
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Who Will Live... Will See  83 911 Production Cab #10, Slightly Modified: Unslanted, 3.2, PMO EFI, TECgt, CE 911 CAM Sync / Pulley / Wires, SSI, Dansk Sport 2/2, 17" Euromeister, CKO GT3 Seats, Going SOK Super Charger |
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08-13-2018, 01:54 AM
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That's fond- just deglaze
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Hi @lonekiawe- Still running great- no stalling issues- very happy. I also did purchase new (correct) Porsche hose clamps from our host (trying to keep everything period correct)
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08-13-2018, 06:49 AM
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Registered
Join Date: Oct 2006
Location: MYR S.C.
Posts: 17,321
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most people change the ICV when it is DOING its job. that is the idle is surging, not that that's correct, but something is usually telling the icv to vary the idle. this is probably one of the most miss diagnosed parts. I might second a voltage reg.
your case it WONT idle. usually a stuck ICV or just bad. good job
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86 930 94kmiles [_ _] RUNNING:[__] NOT RUNNING: ____77 911S widebody: SOLD88 BMW 325is 200K+ SOLD 03 BMW 330CI 220K:: [_ _] RUNNING: [__] NOT RUNNING:01 suburban 330K:: [_ _] RUNNING: [__] NOT RUNNING:RACE CAR:: sold |
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08-13-2018, 07:00 AM
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That's fond- just deglaze
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Hi All- Just a quick follow up- now at 164K miles. It's been 6 years and 32K since the ICV swap, and I noticed in the last two days (and only when the A/C is on) that she would stall about 30% of the time when shifting into neutral. RPMs would drop below 300 (again, only with A/C on) and flatline. Pretty maddening, but she would then fire up immediately. The last ICV clean was at 154K miles (2 years ago). Hosed down the ICV internals and did the shake-shake. An absolute Night and Day difference. The most surprising characteristic (post-clean) was the lack any of rpm drop. Once again, rock solid. A clean ICV is a happy ICV.
  Cooking on a Porsche 911- The herbal butter made the difference. https://www.youtube.com/watch?v=FvXBR50rH9E __________________
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Missed Approach Petra- 1986 Coupe Last edited by Missed Approach; 07-17-2024 at 03:55 PM.. |
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07-17-2024, 03:35 PM
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Still here
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How badly gummed up is the ICV to cause this problem ?
Post a pic of the internals if you have them. |
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07-17-2024, 06:05 PM
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That's fond- just deglaze
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Hi Pmax- It didn't look too bad on the inside, but it took some degree of shaking before I started to hear the distinctive clack of free movement.
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Missed Approach Petra- 1986 Coupe |
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07-17-2024, 06:08 PM
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Still here
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Thanks, one of these days, I need to take a look at the ICV in my 87 but then it has been running flawlessly ... though it is right there and easily accessible thanks to the thoughtful design of the Motronic system. Berryman makes some good stuff. I use the B12 on my DDs regularly.
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07-17-2024, 06:43 PM
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Carrera
Black Label
Das Babe
Das Babe Metalberiech
