rpm fluctuating at idle after wamred up,HPFP? - BMW 3-Series (E90 E92) Forum

HermanL · 05-18-2011, 09:17 AM

Hi guys, so recently i noticed rpm fluctuated from around 800-600 when i was at stop light waiting, it only happened when the car is fully warmed up. I don't have BT scan tool but i tried the read it with a code reader from autozone, no codes stored, no check lights and no long crank.maybe i am paranoid but the car feels a bit sluggish at low rpm. so is it possible that the pump is on its way out? or something else? anyone has this symptom before? thanks for inputs

335BBS · 05-18-2011, 09:47 AM

5 posts like this/week. There is a new one here now. Do you guys like seeing your name in lights or something?

HermanL · 05-18-2011, 10:00 AM

Quote:

Originally Posted by doubleclutch

Drove 2 335s both had the same issue. No codes

i searched previous threads, seems most people have this issue due to tune/DP, however mine car is bone stock for now, not sure this will help

mundo74 · 05-18-2011, 12:01 PM

Has the very same issue at stop lights with warm engine. Only the 2aaf code was stored. Long story short turns out my intake valves were heavily deposited. Dealer cleaned them after a puma case and has been ok since

Syndicategt · 05-18-2011, 12:09 PM

600-800 is fine, what version DME are you running?

When you are bouncing from 600-1300ish then you have problems, which indicated bad injectors.

*edit glad you got it fixed....I'm cleaning my intake valves this weekend.

HermanL · 05-18-2011, 01:06 PM

Quote:

Originally Posted by Syndicategt

600-800 is fine, what version DME are you running?

When you are bouncing from 600-1300ish then you have problems, which indicated bad injectors.

*edit glad you got it fixed....I'm cleaning my intake valves this weekend.

Thank you for info, i would say it's more like 600-900, but it never exceed 1000 at idle except for cold start, I am not sure how to check DME, BT cable is on its way, would the cable be able to check this?

HermanL · 05-18-2011, 01:08 PM

Quote:

Originally Posted by mundo74

Has the very same issue at stop lights with warm engine. Only the 2aaf code was stored. Long story short turns out my intake valves were heavily deposited. Dealer cleaned them after a puma case and has been ok since

Thanks for the reply, I really want to do this myself, just not so confident tearing the engine apart since i have never done this before..

05-18-2011, 09:17 AM	#1
HermanL First Lieutenant Drives: e92 6mt 335i Join Date: Feb 2011 Location: Columbia MO Posts: 318 iTrader: (3)	rpm fluctuating at idle after wamred up,HPFP? Hi guys, so recently i noticed rpm fluctuated from around 800-600 when i was at stop light waiting, it only happened when the car is fully warmed up. I don't have BT scan tool but i tried the read it with a code reader from autozone, no codes stored, no check lights and no long crank.maybe i am paranoid but the car feels a bit sluggish at low rpm. so is it possible that the pump is on its way out? or something else? anyone has this symptom before? thanks for inputs
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05-18-2011, 12:01 PM	#4
mundo74 First Lieutenant Drives: 08' E90 335 Join Date: Oct 2005 Location: P.Pines, FL Posts: 383 iTrader: (2)	Has the very same issue at stop lights with warm engine. Only the 2aaf code was stored. Long story short turns out my intake valves were heavily deposited. Dealer cleaned them after a puma case and has been ok since __________________ Black lines\|M shifter\|p3 vent gauge\|BMW PE\|Cobb AP\|Mtech LED DRL\|Wagner FMIC

05-18-2011, 12:09 PM	#5
Syndicategt Brigadier General Drives: 335i Join Date: Sep 2009 Location: Nor Cal Posts: 3,738 iTrader: (11)	600-800 is fine, what version DME are you running? When you are bouncing from 600-1300ish then you have problems, which indicated bad injectors. edit glad you got it fixed....I'm cleaning my intake valves this weekend. __________________ 2008 BMW 335i e90 - Sold* - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /

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05-18-2011, 09:47 AM	#2
335BBS Brigadier General Drives: 2009 335 coupe. Join Date: Jan 2010 Location: Toronto, Ontario Posts: 3,562 iTrader: (0)	5 posts like this/week. There is a new one here now. Do you guys like seeing your name in lights or something?