 » Site Navigation | | | | » Recent Threads | 1999 M3 Swap 09-07-2023 10:10 PM 05-02-2024 08:18 PM 6 Replies, 330,000 Views | | | |  |  |  |  12-12-2009, 12:38 AM | #1 | | Junior Member Join Date: Nov 2009 Location: San Antonio, TX Posts: 5 |  idle situation
got a question??? my 96 ti automatic normally idle at 750-800 but when I turn on the AC, and I'm stopped at a light, the idle goes down to about 400 then goes back up, without the AC, idle is just fine..any clue? took it to the shop and hook it up, no code came up. |  |  | | 12-12-2009, 04:15 AM | #2 | | Member Join Date: Mar 2009 Location: Central and Southern California Posts: 34 |
Sounds just like any other car I've driven. Sounds normal. | | | | | 12-12-2009, 04:40 PM | #3 | | Junior Member Join Date: Nov 2009 Location: San Antonio, TX Posts: 5 | idle situation
no..I know it will change when I turn the AC but why does it idle down when I stop at a light or stop for a certain amount of time. that is my conundrum. | | | | | 12-12-2009, 05:07 PM | #4 | | Senior Member Join Date: Aug 2006 Location: Central NJ Posts: 2,440 |
Clean your idle control valve | | | | | 12-13-2009, 02:59 AM | #5 | | Senior Member Join Date: Nov 2003 Location: Walnut Creek, CA Posts: 642 |
This happened to me. I call it the bouncing idle. I suspect that the idle is set at a point that is ok for idling with no accessories on. The AC compressor "bogs" the engine at idle that the DME over compensates, shooting up the rpms, then drops the rpm back to the set point, but the cycle starts again when the idle drops b/c of the AC. I cleaned the ICV, got a new Dinan chip, nothing helped, except putting on a set of VAC underdrive pullies. This made any parasitic losses 10-15% less. After I put the pullies on, no more bouncing idle. __________________
'95 330ti CS w/sr delete, S50USB30, cams, 24# inj, Conforti SW, Euro HFM, Samco Silicone Intake Boot, BBTB, Euro Oil Cooler, JTD CAI Duct, RE DMS exhaust, RE Tranny mounts, CF Valve Cover, LTW flywheel/Kevlar sprung hub clutch, RE SSK, 3.46 Finned LSD (M6) , M3 tranny, Brembos, RE Wheel Studs, SS brake/clutch lines, CF interior, Rear Headrest retrofit, Tilt Steering retrofit, 13.5 lb DynaBatt in rear, LED interior/footwell lights, ZKW HID, Headlight Aim Control, Rear fog light w/cluster indicator, CF 3 Aux gauge pod, BMW Traffic Pro/Alpine MP3-CD Changer, Staggered LTW wheels, '95 M3 steering rack, VIS CF Hood, M3 LTW Strut Bar, TCK SA coilovers, Red LTW Motorsport Seatbelts, OEM Fire Extinguisher, Z8 Starter button, Auto dim rear view mirror w/ Homelink/Compass, PDC, Rear Sun Shade, Euro Gauge Cluster w/oil temp/shift light , Headlight Washers, "Motorsport" Door Handles, CF Grills, French ZKW Fogs, Euro dash bins, Power Lumbar Support is next, Coming e39 M5 interior light, Bimmer Magazine 8/2007 | | | | | 12-13-2009, 06:18 AM | #6 | | Junior Member Join Date: Nov 2009 Location: San Antonio, TX Posts: 5 |
what is the VAC underdrive pullies? | | | | | 12-13-2009, 07:50 AM | #7 | | Senior Member Join Date: Nov 2003 Location: Walnut Creek, CA Posts: 642 |
Quote: Originally Posted by mou  what is the VAC underdrive pullies? | http://www.vacmotorsports.com/catalo...2-e36-only.htm This is for a 1995 M42 motor. The new motor from 96-99 is an M44. Check to make sure these are correct for your model year. I can't be sure there are pulleys for the M44, but do a search and find out. I see you have a '96, which is a M44 __________________
'95 330ti CS w/sr delete, S50USB30, cams, 24# inj, Conforti SW, Euro HFM, Samco Silicone Intake Boot, BBTB, Euro Oil Cooler, JTD CAI Duct, RE DMS exhaust, RE Tranny mounts, CF Valve Cover, LTW flywheel/Kevlar sprung hub clutch, RE SSK, 3.46 Finned LSD (M6) , M3 tranny, Brembos, RE Wheel Studs, SS brake/clutch lines, CF interior, Rear Headrest retrofit, Tilt Steering retrofit, 13.5 lb DynaBatt in rear, LED interior/footwell lights, ZKW HID, Headlight Aim Control, Rear fog light w/cluster indicator, CF 3 Aux gauge pod, BMW Traffic Pro/Alpine MP3-CD Changer, Staggered LTW wheels, '95 M3 steering rack, VIS CF Hood, M3 LTW Strut Bar, TCK SA coilovers, Red LTW Motorsport Seatbelts, OEM Fire Extinguisher, Z8 Starter button, Auto dim rear view mirror w/ Homelink/Compass, PDC, Rear Sun Shade, Euro Gauge Cluster w/oil temp/shift light , Headlight Washers, "Motorsport" Door Handles, CF Grills, French ZKW Fogs, Euro dash bins, Power Lumbar Support is next, Coming e39 M5 interior light, Bimmer Magazine 8/2007
Last edited by clex2; 12-13-2009 at 07:53 AM. | | | | |
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