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      11-09-2012, 10:12 PM   #1
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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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      11-09-2012, 10:13 PM   #2
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Check engine light and car SLOW.
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      11-09-2012, 10:17 PM   #3
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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..

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Originally Posted by Fully_Bolted View Post
Check engine light and car SLOW.
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      11-09-2012, 10:20 PM   #4
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Quote:
Originally Posted by 335twins View Post
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:
  1. Scan for Fault Codes
  2. Take some logs & check your boost curve
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      11-09-2012, 10:22 PM   #5
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well i dont have anything to scan or log the car
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Originally Posted by benzy89 View Post
Since you're not getting a CEL, can really only do two things:
  1. Scan for Fault Codes
  2. Take some logs & check your boost curve
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      11-10-2012, 12:28 AM   #6
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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?
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      11-10-2012, 12:32 AM   #7
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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.
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      11-10-2012, 12:44 AM   #8
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yes exactly, it feels like the car wants to go and then i feel the jerk, go, jerk go..

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Originally Posted by Dave W. View Post
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?
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      11-10-2012, 12:54 AM   #9
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my fuel injectors, spark plugs were replaced 2k miles ago. It is hesitation, but more like jerking feeling.

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Originally Posted by Gfabry View Post
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.
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      11-10-2012, 08:31 AM   #10
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Any other ideas guys?
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      11-10-2012, 09:05 AM   #11
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Scan for codes. Otherwise its just a guessing game. Any independent BMW shop should be able to scan the car for a few bux.

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      11-10-2012, 10:32 AM   #12
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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
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      11-10-2012, 10:32 AM   #13
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At will also feel super sluggish, like a corolla.
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      11-10-2012, 10:57 AM   #14
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Your clutch is going out
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      11-10-2012, 11:46 AM   #15
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Quote:
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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.
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      11-10-2012, 12:00 PM   #16
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Quote:
Originally Posted by zztwinturbozz
Your clutch is going out
It's automatic
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      11-10-2012, 12:02 PM   #17
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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.
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Last edited by 335twins; 11-10-2012 at 02:02 PM.
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      11-13-2012, 08:38 AM   #18
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Quote:
Originally Posted by 335twins View Post
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.
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      11-13-2012, 08:45 AM   #19
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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.
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      11-13-2012, 08:57 AM   #20
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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.
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      11-13-2012, 11:06 AM   #21
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      11-13-2012, 11:13 AM   #22
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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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