boost leak? - BMW 3-Series (E90 E92) Forum

335twins · 11-09-2012, 10:12 PM

Hi All,

how does a boost leak feel?, i am not sure if i have a boost leak or not, would you feel hesitation, jerking?

Thanks

Fully_Bolted · 11-09-2012, 10:13 PM

Check engine light and car SLOW.

335twins · 11-09-2012, 10:17 PM

not getting check engine light and the car is ok until a certain speed, example, going around 75mhp, 2k rpm, i get on the throttle a little, the car starts going, but i feel some jerking at times..

Quote:

Originally Posted by Fully_Bolted

Check engine light and car SLOW.

benzy89 · 11-09-2012, 10:20 PM

Quote:

Originally Posted by 335twins

Hi All,

how does a boost leak feel?, i am not sure if i have a boost leak or not, would you feel hesitation, jerking?

Thanks

Since you're not getting a CEL, can really only do two things:

Scan for Fault Codes
Take some logs & check your boost curve

335twins · 11-09-2012, 10:22 PM

well i dont have anything to scan or log the car

Quote:

Originally Posted by benzy89

Since you're not getting a CEL, can really only do two things:

Scan for Fault Codes
Take some logs & check your boost curve

Dave W. · 11-10-2012, 12:28 AM

Does the jerkiness you get feel like a change in engine power, like it has good power for a second, then power is down for a second?

JB4 PWR · 11-10-2012, 12:32 AM

Sounds like a pre misfire. Car hesitation under load right? If you keep punching until the computer throws a misfire we can find out where your problem is coming from. Usually plugs, coils or injector.

335twins · 11-10-2012, 12:44 AM

yes exactly, it feels like the car wants to go and then i feel the jerk, go, jerk go..

Quote:

Originally Posted by Dave W.

Does the jerkiness you get feel like a change in engine power, like it has good power for a second, then power is down for a second?

335twins · 11-10-2012, 12:54 AM

my fuel injectors, spark plugs were replaced 2k miles ago. It is hesitation, but more like jerking feeling.

Quote:

Originally Posted by Gfabry

Sounds like a pre misfire. Car hesitation under load right? If you keep punching until the computer throws a misfire we can find out where your problem is coming from. Usually plugs, coils or injector.

335twins · 11-10-2012, 08:31 AM

Any other ideas guys?

Mike@N54Tuning.com · 11-10-2012, 09:05 AM

Scan for codes. Otherwise its just a guessing game. Any independent BMW shop should be able to scan the car for a few bux.

Mike

neilvosko · 11-10-2012, 10:32 AM

Slow boost and will sound like turbulent air. I had to add gasket maker to my charge pipe and bob recently, the 15 psi really does a number on em

neilvosko · 11-10-2012, 10:32 AM

At will also feel super sluggish, like a corolla.

zztwinturbozz · 11-10-2012, 10:57 AM

Your clutch is going out

benzy89 · 11-10-2012, 11:46 AM

Quote:

Originally Posted by 335twins

well i dont have anything to scan or log the car

AutoZone or find a local who's got the COBB AccessPORT & can scan for fault codes/log some pulls.

335twins · 11-10-2012, 12:00 PM

Quote:

Originally Posted by zztwinturbozz

Your clutch is going out

It's automatic

335twins · 11-10-2012, 12:02 PM

The car doesn't feel sluggish, it pulls like a freight train but at 80 mph when I am crusing and get on the throttle a bit I feel like the car is jerking, if that's the right way to explain it, it's pulling but with jerking in between like someone would hit me from behind.

Fully_Bolted · 11-13-2012, 08:38 AM

Quote:

Originally Posted by 335twins

The car doesn't feel sluggish, it pulls like a freight train but at 80 mph when I am crusing and get on the throttle a bit I feel like the car is jerking, if that's the right way to explain it, it's pulling but with jerking in between like someone would hit me from behind.

This is all just a guessing game until you can come back with some tangible data, have the car scanned for codes or find a way to get some datalogs.

MSport35TT · 11-13-2012, 08:45 AM

I am using a Cobb Tuner and I get the same hesitation at higher speeds/gear. It's tuned with LT sport. I'm also curious as to what it could be.

nailer335 · 11-13-2012, 08:57 AM

Just come use my BT cable already, you can scan the car and figure out whats going on and know exactly how to take care of it.

sickem · 11-13-2012, 11:06 AM

Yes, codes are your friend.

335twins · 11-13-2012, 11:13 AM

Going to scan for codes today, wish me luck. I am still under warranty so i might use the "Useless BMW service" to see if they can figure something out.

11-09-2012, 10:12 PM	#1
335twins First Lieutenant Drives: 2009 335i, 2012 x3 35i Join Date: Mar 2012 Location: AZ Posts: 348 iTrader: (1)	boost leak? Hi All, how does a boost leak feel?, i am not sure if i have a boost leak or not, would you feel hesitation, jerking? Thanks
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11-10-2012, 08:31 AM	#10
335twins First Lieutenant Drives: 2009 335i, 2012 x3 35i Join Date: Mar 2012 Location: AZ Posts: 348 iTrader: (1)	Any other ideas guys? __________________ Cobb tuned

11-10-2012, 09:05 AM	#11
Mike@N54Tuning.com BimmerPost Supporting Vendor Drives: 07335i Join Date: Dec 2008 Location: Earth Posts: 12,356 iTrader: (78)	Scan for codes. Otherwise its just a guessing game. Any independent BMW shop should be able to scan the car for a few bux. Mike __________________ Lowest Price GUARANTEED on ALL PRODUCTS!! JB4 G5 On Sale - FREE Shipping Click Me - NEW JB4(N55) & DCI's $95.00 NEW F30-328 N20 Tune(Stage1) BMS Oil Catch Can (On Sale)

11-10-2012, 12:02 PM	#17
335twins First Lieutenant Drives: 2009 335i, 2012 x3 35i Join Date: Mar 2012 Location: AZ Posts: 348 iTrader: (1)	The car doesn't feel sluggish, it pulls like a freight train but at 80 mph when I am crusing and get on the throttle a bit I feel like the car is jerking, if that's the right way to explain it, it's pulling but with jerking in between like someone would hit me from behind. __________________ Cobb tuned Last edited by 335twins; 11-10-2012 at 02:02 PM.

11-13-2012, 08:45 AM	#19
MSport35TT First Lieutenant Drives: 335i Join Date: Oct 2012 Location: NJ & MA Posts: 374 iTrader: (1) Garage List 2010 BMW 335ix [1.00]	I am using a Cobb Tuner and I get the same hesitation at higher speeds/gear. It's tuned with LT sport. I'm also curious as to what it could be. __________________ TiAg N54 xDrive M-Sport 6MT:JB4 G5 BMS Flash ll HPF Front Mount ll AR 3" Cat-less DP ll aFe Stage 2 ll M3 Rear Sway ll KW Variant 3 ll GTS 19" 359m ll BMW PE Axle Back ll Novillo M3 Int

11-09-2012, 10:13 PM	#2
Fully_Bolted Banned Drives: E92 335i Join Date: Sep 2012 Location: USA Posts: 445 iTrader: (0)	Check engine light and car SLOW.

11-10-2012, 12:28 AM	#6
Dave W. First Lieutenant Drives: Porsche 951, 1992 Eagle Talon Join Date: Apr 2012 Location: SF Bay Area Posts: 331 iTrader: (0)	Does the jerkiness you get feel like a change in engine power, like it has good power for a second, then power is down for a second?

11-10-2012, 12:32 AM	#7
JB4 PWR First Lieutenant Drives: 335i Join Date: Mar 2012 Location: Palm Beach Posts: 350 iTrader: (0)	Sounds like a pre misfire. Car hesitation under load right? If you keep punching until the computer throws a misfire we can find out where your problem is coming from. Usually plugs, coils or injector.

11-10-2012, 10:32 AM	#12
neilvosko Major Drives: 335i e92 FBO Join Date: Dec 2011 Location: miami Posts: 1,178 iTrader: (12)	Slow boost and will sound like turbulent air. I had to add gasket maker to my charge pipe and bob recently, the 15 psi really does a number on em

11-10-2012, 10:57 AM	#14
zztwinturbozz Private Drives: 335i xdrive Join Date: Jun 2012 Location: Denver Posts: 76 iTrader: (1)	Your clutch is going out

11-13-2012, 08:57 AM	#20
nailer335 Captain Drives: alpine '08 e92 335xi Join Date: Feb 2010 Location: Arizona Posts: 669 iTrader: (0)	Just come use my BT cable already, you can scan the car and figure out whats going on and know exactly how to take care of it.

11-13-2012, 11:06 AM	#21
sickem Freude am fahren Drives: in the fast lane Join Date: Mar 2010 Location: People's Republic of New Jersey Posts: 1,737 iTrader: (4) Garage List 2008 BMW 335i E90 [3.25]	Yes, codes are your friend. __________________ Cobb E40 PROtune by Jake@PTF/RR catless DPs/aFe DCI/ETS 5" FMIC/Alpina B3 TCU flash/BMW Performance Style 313 Wheels

11-13-2012, 11:13 AM	#22
335twins First Lieutenant Drives: 2009 335i, 2012 x3 35i Join Date: Mar 2012 Location: AZ Posts: 348 iTrader: (1)	Going to scan for codes today, wish me luck. I am still under warranty so i might use the "Useless BMW service" to see if they can figure something out.

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