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Testing the Motronic ICV/ISV?
I checked the ohmage between the two outside pins and the centre pin on the ICV/ISV and it measures 20 ohms.
I read in historical posts that this is what it's suppose to be, however, does it necessarily mean the ICV is 100% OK? Could the ICV still be faulty but have proper resistance values?
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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12-15-2005, 03:26 PM
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Does anyone have any pics of a stripped down ICV/ISV?
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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12-15-2005, 05:14 PM
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I would take it off, clean thoroughly, make sure it can open & close smoothly, put it back in and see where you stand. If your having problems with it that's the first thing I would do.
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12-15-2005, 05:25 PM
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WydRyd,
What makes you think it's faulty? The Bentley has some good test procedures for this part; do you have it? ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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12-15-2005, 06:19 PM
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I only suspect it's faulty because the engine won't idle and dies after 3-5 seconds.
I checked ignition, fuel pressure, compression, AFM etc and they all look OK. Only other thing affecting idle is the ICV or a big vacuum leak somewhere  No I don't have the Bentley manual........... yet! EDIT: Oh, I tried banging on the ICV with a wrench whilst the car was idling. Made no difference too. Couldn't be THAT siezed up, right?
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
Last edited by WydRyd; 12-15-2005 at 07:14 PM.. |
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12-15-2005, 07:05 PM
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I would also check the Throttle position microswitch.
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ßrandon |
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12-15-2005, 07:16 PM
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Or check the o2 sensor. I cleaned my ICV and replaced my o2. That fixed my idle problem. How many miles on your sensor?
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If it flows, it goes. If its smooth, it moves. Any questions? 96 993 C2 (Current) 87 911 Factory Turbo-Look Cab (Sold) 85 911 Factory Turbo-Look Targa (Gone) |
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12-16-2005, 04:07 AM
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Don't forget to try the age old Carrera favorite leak point. The intake manifold bolts are notorious for coming loose. I routinely tighten mine. Use the intake cleaner to spray around the base of the intake to see if the idle changes. Mine did.
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DonMo 1984 911 Carrera Targa 3.2 liter, SSI's, Dansk 2 to 1, Steve Wong Chip Columbia, SC "Go Hokies" |
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12-16-2005, 07:48 AM
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DonMo has a good suggestion, but you would want to take the ISV out of the picture before doing this though...
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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12-16-2005, 09:06 AM
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Quote:
I'll rule out the ICV completely fist before removing my whole intake 
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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12-16-2005, 01:13 PM
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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12-16-2005, 02:48 PM
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You might try just retorquing the intake bolts and see if that will cure the leak...
But probably not.  ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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12-16-2005, 02:55 PM
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Yeh I tried that but it didn't make much difference at all.
Might as well rip off the whole intake and do all 12, just to be 100% sure
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition
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12-16-2005, 03:01 PM
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Quote:
ianc
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BMW 135i. Nice. Fast. But no 911... "I will tell you there is a big difference between driving money and driving blood, sweat and tears." - PorscheGuy79 |
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12-16-2005, 03:19 PM
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1987 Porsche 911 Carerra
1987 Porsche 911 3.2
1984 Porsche Targa 3.2
