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E82 / E88 1 Series (2008 - 2013)
BMWs throw back to the iconic 2002, with a renewed form and function. The smallest car in BMW's line up but still packs a punch. Available in coupe or convertible, powered by either an inline 6 in the 128 or the twin turbo rocket sled 135.

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  #1  
Old 10-03-2013, 06:59 PM
DirtLizzard DirtLizzard is offline
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Location: Bethlehem PA
 
Join Date: Oct 2013
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Mein Auto: 2008 135
new owner of a 2008 135 / funky idle issue

Hi, I am new to board. Just picked up a stellar condition 08 135 with 47,000 miles. Car is amazing. Only concern out of the gate is a funky idle at times. Every so often at idle the motor trembles very quickly like it is going to stall but it comes back super fast and then you can watch the rpm needles slightly climb and then re-stabilize. Car hadn't been driven much over last 2 months as it was sitting at a dealer. I had a 97 528 that had the sharkinjector chip upgrade and cold air intake so I am used to putting quality high grade fuel in, so i filled the 135 with sunoco ultra and have been running it mildly hard to bring her up to my speed. Any suggestions regarding idle issue or things i should do to help this beauty keep running clean would be appreciated, or any suggestions and info regarding the 135 in general. I am aware of the ethanol issues with the HPFP. car is under CPO warranty for 9 more months.
thanks.
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  #2  
Old 10-04-2013, 07:05 AM
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Leslierc Leslierc is offline
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Location: Silver Spring, Maryland - USA
 
Join Date: Sep 2006
Posts: 4,376
Mein Auto: From BMWs to Porsches
Two things come to mind. Be sure to use 91 octane or better...I always used 93. Also, you need to use a fuel additive to ensure that the injectors remain clean...I always used Techron.
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2013 Porsche Carrera 4
2011 Panamera 4S; 2012 Mini CooperS convertible;
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport

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Last edited by Leslierc; 10-04-2013 at 07:08 AM.
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  #3  
Old 10-04-2013, 07:13 AM
DirtLizzard DirtLizzard is offline
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Location: Bethlehem PA
 
Join Date: Oct 2013
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Mein Auto: 2008 135
Thanks, yes I run 93 80% of the time with all my Bimmers....and use octane boost and injector cleaner about every 6 to 8 weeks. Any thoughts on if the ethanol treatment additives are useful? there are several on the market that claim to stabilize the ethanol and help prevent the "gumming up" issues.
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Old 10-04-2013, 07:58 AM
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Leslierc Leslierc is offline
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Location: Silver Spring, Maryland - USA
 
Join Date: Sep 2006
Posts: 4,376
Mein Auto: From BMWs to Porsches
Quote:
Originally Posted by DirtLizzard View Post
Thanks, yes I run 93 80% of the time with all my Bimmers....and use octane boost and injector cleaner about every 6 to 8 weeks. Any thoughts on if the ethanol treatment additives are useful? there are several on the market that claim to stabilize the ethanol and help prevent the "gumming up" issues.
I just re-read your post and saw that you use Sunoco Ultra...great stuff! I have no ideas regarding ethanol treatment additives. However, I seem to recall also experiencing an infrequent rough idling in my 135i, as you described. It would be only momentary and did not happen that often. Your assessment could be correct that it's as a result of the car sitting for over 2 months. At any rate, enjoy. My 135i convertible was the most fun of all the BMWs I owned.
__________________
2013 Porsche Carrera 4
2011 Panamera 4S; 2012 Mini CooperS convertible;
Prior BMWs: `05 645CiC; `07 650i; `08 M6 convertible; '08 135i; `11 750ix MSport

"You think that's air you're breathing now?"
-Morpheus
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  #5  
Old 11-10-2013, 06:47 AM
rizzapizza rizzapizza is offline
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Location: CT
 
Join Date: Nov 2013
Posts: 1
Mein Auto: 2005 Mazda3s
Have you tried just checking the leads on the battery? Sometimes when shops work on cars they remove the leads and fail to reattach them correctly.

Take the leads off, rub the connections with some scotch-brite or equiv., and reattached. Make sure the connection is firm. I have had idling problems in the past with my Mazda3 (exact problem you just described) and this resolved it.
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  #6  
Old 11-11-2013, 04:39 PM
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pagefault pagefault is offline
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Location: Redmond, WA
 
Join Date: Jul 2009
Posts: 224
Mein Auto: 2010 128i Coupe 6MT
Quote:
Originally Posted by DirtLizzard View Post
Hi, I am new to board. Just picked up a stellar condition 08 135 with 47,000 miles. Car is amazing. Only concern out of the gate is a funky idle at times. Every so often at idle the motor trembles very quickly like it is going to stall but it comes back super fast and then you can watch the rpm needles slightly climb and then re-stabilize. Car hadn't been driven much over last 2 months as it was sitting at a dealer. I had a 97 528 that had the sharkinjector chip upgrade and cold air intake so I am used to putting quality high grade fuel in, so i filled the 135 with sunoco ultra and have been running it mildly hard to bring her up to my speed. Any suggestions regarding idle issue or things i should do to help this beauty keep running clean would be appreciated, or any suggestions and info regarding the 135 in general. I am aware of the ethanol issues with the HPFP. car is under CPO warranty for 9 more months.
thanks.
I have had weird stumbling issues the first couple minutes after a cold start. It's only under 2K RPM and after it gets going for the day, it's generally smooth.

I took it to the dealer and they did a software update. It's not 100% gone, but it did seem to substantially reduce how often and how severe it would occur.
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