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E90/E91/E92/E93 (2006 - 2013)
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  #1  
Old 01-25-2015, 09:14 PM
hissa93 hissa93 is offline
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Location: Dearborn, Michigan
 
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Mein Auto: 2007 BMW 335i
bmw 335i 750rpm idle

sometimes my car would have a small hiccup like a small misfire but not a misfire when its parked for like 5 min no codes or engine malfunction then it will idle form 600rpm to 750rpm and stays like that till i restart the car goes back to 600rpm leave it parked for 10-15 min one or two small hiccup then the goes back to 750rpm doesn't happen every time is this normal? i replaced the ignition coils and spark plugs two months ago bosch brand, anyone had the same symptoms and solved it?

Last edited by hissa93; 01-25-2015 at 09:17 PM.
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  #2  
Old 01-26-2015, 01:16 PM
hissa93 hissa93 is offline
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Anyone?
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  #3  
Old 08-23-2016, 08:56 AM
Alonso_E92 Alonso_E92 is offline
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Mein Auto: 2008 bmw 335xi E92
Having the same problem

Did you fix the issue ? My car has been doing the same exact thing! Please help !
Thanks
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  #4  
Old 08-23-2016, 09:19 AM
MMMGP MMMGP is offline
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I too notice a small stumbling when at idle around that RPM range. I have read that the N54 is not a "smooth" engine at idle, but part of me thinks that the injectors are on the way out. I too have no CEL, codes, or notice any other stumbling/stuttering during grandma or spirited driving.
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  #5  
Old 08-23-2016, 09:23 AM
Alonso_E92 Alonso_E92 is offline
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Exsacly the same here man I have already did walnut blasting maf sensor new spark plugs and new ignition coils walnut blasting helpd a little but still rpms go up to 750 after driving car for a while going to try chevron fuel cleaner today see if it helps at all
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  #6  
Old 08-23-2016, 09:27 AM
MMMGP MMMGP is offline
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How many miles did your E90 have when you decided to have the intake valves blasted? I'm at 39k now and was thinking of making the blasting a 50k maintenance item.
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  #7  
Old 08-23-2016, 09:29 AM
Alonso_E92 Alonso_E92 is offline
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Mein Auto: 2008 bmw 335xi E92
Mines at 106k and it was very bad , I'm going to also clean the the map sensor see if it maybe it's clogged up with carbon
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  #8  
Old 08-23-2016, 09:48 AM
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CALWATERBOY DUE CALWATERBOY DUE is offline
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Mein Auto: 09 E93 335i somewhat mod
Quote:
Originally Posted by hissa93 View Post
sometimes my car would have a small hiccup like a small misfire but not a misfire when its parked for like 5 min no codes or engine malfunction then it will idle form 600rpm to 750rpm and stays like that till i restart the car goes back to 600rpm leave it parked for 10-15 min one or two small hiccup then the goes back to 750rpm doesn't happen every time is this normal? i replaced the ignition coils and spark plugs two months ago bosch brand, anyone had the same symptoms and solved it?

Basics apply: [read codes]
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  #9  
Old 08-23-2016, 09:56 AM
Alonso_E92 Alonso_E92 is offline
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Mein Auto: 2008 bmw 335xi E92
My car is the same this happend right after I changed the spark plugs I put the old ones back in and it's fine but there something going on because the new ones are oem and it shakes and the old ones and new ones are both oem ones
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  #10  
Old 08-23-2016, 11:13 AM
MMMGP MMMGP is offline
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On my car, the dealer replaced the spark plugs and a number of other items before I purchased the car. Alonso--what plugs did you install? BOSCH ZGR6STE2?

I just pulled the engine cover to inspect the (Version 8) fuel injectors and clean the MAP sensor. The MAP sensor was clean, no gunk, but there was a light coating of oil which is common.
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  #11  
Old 08-23-2016, 01:23 PM
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need4speed need4speed is offline
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I had this issue once in a great while on my E93. However mine seemed to be fuel related. I put in some Techron and the issue vanished.
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  #12  
Old 08-23-2016, 03:04 PM
MMMGP MMMGP is offline
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Quote:
Originally Posted by need4speed View Post
I had this issue once in a great while on my E93. However mine seemed to be fuel related. I put in some Techron and the issue vanished.
I can do that. How long is your daily drive or commute?
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  #13  
Old 08-23-2016, 10:47 PM
Alonso_E92 Alonso_E92 is offline
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I have a feeling the map sensor could be causing this (the one on top of the intake mainfold) can someone please take there sensor off and post pics of how dirty it is mine is very dirty I tried cleaning it but has dirty stuck to it

If someone can post pics I would highly apriciate it
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  #14  
Old 08-23-2016, 10:50 PM
MMMGP MMMGP is offline
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I cleaned my MAP sensor. Once I removed it from the intake manifold, I could see a yellow capacitor inside. I used some CRC MAF cleaner and sprayed it down. No change, the idle stumbling is still there.

I'm currently on an $8 dose of Techron from the LPS. Will report back in a couple days.
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Last edited by MMMGP; 08-23-2016 at 10:52 PM.
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  #15  
Old 08-24-2016, 10:42 AM
wilt wilt is offline
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Quote:
Originally Posted by hissa93 View Post
sometimes my car would have a small hiccup like a small misfire but not a misfire when its parked for like 5 min no codes or engine malfunction then it will idle form 600rpm to 750rpm and stays like that till i restart the car goes back to 600rpm leave it parked for 10-15 min one or two small hiccup then the goes back to 750rpm doesn't happen every time is this normal? i replaced the ignition coils and spark plugs two months ago bosch brand, anyone had the same symptoms and solved it?
My 2011 328i had small hiccup stumble at idle in a parking lot that we had just pulled into, and it turned out to be a failing Eccentric Shaft Sensor, which the dealer replaced under SULEV warranty (no deductible, vs. the $50 deductible CPO)
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  #16  
Old 08-24-2016, 11:13 AM
MMMGP MMMGP is offline
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Thanks for the info Wilt. The N54 engine does not have an eccentric shaft sensor, instead there are two pulse generators mounted at the front of the cylinder head, p/n 13627525014. The sensor is completely sealed up and I doubt would ever need a cleaning.
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  #17  
Old 08-26-2016, 11:15 AM
MMMGP MMMGP is offline
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Quote:
Originally Posted by MMMGP View Post
I'm currently on an $8 dose of Techron from the LPS. Will report back in a couple days.
Happy to report that adding the Techron and driving for 25 miles cured the idle issue! The stumbling/missing/dipping of the idle is gone! I used a full 8 oz container of Techron "Complete Fuel System Cleaner" at 3/4 of a tank.

https://www.amazon.com/Chevron-65740.../dp/B000CCOL3I
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09/2010 335is vert Alpine/Schwarz
09/2011 X5 Alpine/Schwarz 35i Premium
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  #18  
Old 08-26-2016, 03:48 PM
wilt wilt is offline
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Quote:
Originally Posted by MMMGP View Post
Happy to report that adding the Techron and driving for 25 miles cured the idle issue! The stumbling/missing/dipping of the idle is gone! I used a full 8 oz container of Techron "Complete Fuel System Cleaner" at 3/4 of a tank.

https://www.amazon.com/Chevron-65740.../dp/B000CCOL3I

Aha! Used to be that the dealer service department threw a bottle of 'stuff' into the gas tank each time you brought it in for service. SA later admitted that you could do the same, "just get a bottle of Techron from Chevron and throw it in the tank peridiocally with fill ups". I cannot remember exactly how long ago that began, but my guess is back when I had my 1981 BMW 528i, as Techron was sold in Chvron stations starting in 1981 and finally got added to Chevron gasoline in 1985 and I stopped adding an extra bottle of it to the tank. Never have had fuel injector issues in the 35 years since! My wife wonders why I seek Chevron while on roadtrips, and I tell her 'because they have good gas' without explaining about Techron. Now I have a story to tell her, about why I prefer Chevron gas.

Last edited by wilt; 08-26-2016 at 03:53 PM.
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