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Old 08-19-2017, 05:14 PM   #1
BlackBMWs
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Default 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!


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Old 08-21-2017, 02:45 AM   #2
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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...?
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Old 08-21-2017, 03:14 AM   #3
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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.


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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

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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!
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Old 08-22-2017, 09:48 PM   #4
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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
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Old 08-23-2017, 03:10 AM   #5
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Thanks Mac


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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!
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Old 08-24-2017, 04:30 AM   #6
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Just to clarify....it is the throttle position sensor! Good luck, mac
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Old 08-24-2017, 07:22 AM   #7
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Yup, I'll be at it again this weekend


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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!
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