» Site Navigation | | » Recent Threads | | | | | | | 08-19-2017, 05:14 PM | #1 | Senior Member Join Date: Feb 2012 Location: Sacramento, CA Posts: 2,451 | Low bouncing idle when warm Troubleshooting question: looked through various posts, nothing conclusive come to mind... My wife's 1997 TI, M44 has an intermittent idle drop once it is warmed up. Runs great until it's warmed up then will have a low idle (I.e. At a stop light) low enough where 1 out of 10 times it will die. Restarts just fine. I'm thinking a slight vacuum leak once it warms up. Any other thoughts or experiences out there? Prolly 20k on the engine since I last installed it. At time, I swapped in new hoses for all rubber and new cooling pipes. The engine itself has 160k or so miles on it. Runs strong above idle. Thanks for reading and in advance for your thoughts. Cheers! Sent from my iPhone using Tapatalk __________________ 1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top 1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52 1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior 1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior Other Current Bimmers: 2006 530i / 2000 2.3L Z3 / 1997 1.9L Z3 / 1999 540it 1997 318ti Sport - "Huera" - RIP 1995 318ti Active - RIP 1995 318ti Sport - "Tiny" Sold 1994 325i Sedan - "Jade" - Sold 1991 318ic - "Bert" - Sold 1985 635csi sold 1984 533i "Max" Sold 1984 318i sold BMWCCA #160411 SUPPORT 318ti.org! CLICK THE LINK ABOVE! Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW! | | | 08-21-2017, 02:45 AM | #2 | Senior Member Join Date: Oct 2008 Location: Los Angeles, CA Posts: 1,464 | Hey Rich! Long time no chat... Does it happen immediately when the DME goes into open loop, or does it not start until the car has been warm for awhile? I'm assuming you've ruled out the ICV...? __________________ 1995 318ti Base - Cosmosschwarz/Sandgrau R.I.P. 1997 318ti Active - Alpinweiß III/Sandgrau 2013 328i Coupe - Le Mans Blau | | | 08-21-2017, 03:14 AM | #3 | Senior Member Join Date: Feb 2012 Location: Sacramento, CA Posts: 2,451 | Hi Jerry! I trust all is well with you! I suspect when it goes into Open loop. Since I was working with it much of the weekend, it really hasn't gone cold. Swapped ICVs and not much difference. I did run the car at high revs for about an hour on the freeway with some Redline fuel system cleaner in half a tank of premium. My wife mentioned to me today she has been running regular for the last year. No idea of any carbon buildup or any other gunk. So, I'll let her run around for a week while I take a set of spare injectors, clean at test them. I also have a set of Magnacor ignition wires coming this week. I do have another ICV I can swap in and test. Sent from my iPhone using Tapatalk __________________ 1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top 1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52 1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior 1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior Other Current Bimmers: 2006 530i / 2000 2.3L Z3 / 1997 1.9L Z3 / 1999 540it 1997 318ti Sport - "Huera" - RIP 1995 318ti Active - RIP 1995 318ti Sport - "Tiny" Sold 1994 325i Sedan - "Jade" - Sold 1991 318ic - "Bert" - Sold 1985 635csi sold 1984 533i "Max" Sold 1984 318i sold BMWCCA #160411 SUPPORT 318ti.org! CLICK THE LINK ABOVE! Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW! | | | 08-22-2017, 09:48 PM | #4 | Senior Member Join Date: Aug 2008 Location: San antonio, tx Posts: 135 | Howdy...i have had a similar problem, and had it checked for a vacuum leak. The technician also cleaned and reconnected the throttle position switch, which has resulted in a marked improvement. I am not a mechanic, so i do not know how all this works, but thought i would pass it along. Happy trails, mac | | | 08-23-2017, 03:10 AM | #5 | Senior Member Join Date: Feb 2012 Location: Sacramento, CA Posts: 2,451 | Thanks Mac Sent from my iPhone using Tapatalk __________________ 1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top 1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52 1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior 1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior Other Current Bimmers: 2006 530i / 2000 2.3L Z3 / 1997 1.9L Z3 / 1999 540it 1997 318ti Sport - "Huera" - RIP 1995 318ti Active - RIP 1995 318ti Sport - "Tiny" Sold 1994 325i Sedan - "Jade" - Sold 1991 318ic - "Bert" - Sold 1985 635csi sold 1984 533i "Max" Sold 1984 318i sold BMWCCA #160411 SUPPORT 318ti.org! CLICK THE LINK ABOVE! Hosting a forum like this is not free. 318ti.org is one of the best BMW forums on the web because it is member supported, not vendor supported. The cost to become a Supporter is a nominal $10.00... A YEAR! DO IT! NOW! | | | 08-24-2017, 04:30 AM | #6 | Senior Member Join Date: Aug 2008 Location: San antonio, tx Posts: 135 | Just to clarify....it is the throttle position sensor! Good luck, mac | | | 08-24-2017, 07:22 AM | #7 | Senior Member Join Date: Feb 2012 Location: Sacramento, CA Posts: 2,451 | Yup, I'll be at it again this weekend Sent from my iPhone using Tapatalk __________________ 1998 318ti Sport - "Cali" Schwartz II/Schwartz sport interior, Cali top 1998 318ti Sport - "Max" Schwartz II/Schwartz sport interior, S52 1997 318ti Sport - "Tiny" Schwartz II/Schwartz sport interior 1995 318ti Active - "Blanca" Alpineweib III/Schwartz leather interior Other Current Bimmers: 2006 530i / 2000 2.3L Z3 / 1997 1.9L Z3 / 1999 540it 1997 318ti Sport - "Huera" - RIP 1995 318ti Active - RIP 1995 318ti Sport - "Tiny" Sold 1994 325i Sedan - "Jade" - Sold 1991 318ic - "Bert" - Sold 1985 635csi sold 1984 533i "Max" Sold 1984 318i sold BMWCCA #160411 SUPPORT 318ti.org! CLICK THE LINK ABOVE! 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