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Random acceleration problems past 5000rpm

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Old May 26, 2011 | 12:49 PM
  #1  
phrenetiK's Avatar
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PHREN PHUN!
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From: houston, tx
Random acceleration problems past 5000rpm

Hey guys, this is what i know about the problem.

-it does not occur every startup and seems to be random
-if i turn off the car and turn it back on the problem goes away
-sometimes it doesnt happen even on the first startup
-at 5000+ and WOT it hits like 5500 and chokes and makes a noise like when you blow air out your mouth while your lips are closed.
-during this time all normal power is gone.

and like i said if i restart the car right after that i can do a WOT to 8000 and it will boost fine.

i have lots of weird issues but i was told the PFC is just weird.

when i start it it will sometimes take about 30 seconds to find a stable idle. it will go like 1000-2000 over and over then settle on 1000. so i dont know if sometimes the maps are not loading right or what. really have no idea.

thanks for any info !
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Old May 26, 2011 | 12:58 PM
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From: Minnesota
My car was doing this, did you by chance install a full exhuast system? eliminating all the cats?
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Old May 26, 2011 | 01:08 PM
  #3  
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PHREN PHUN!
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From: houston, tx
no i have the stock cat still but aftermarket downpipe. i am actually about to delete it with a mid pipe though. i am running 15psi and around 350whp when it is not suffering from this problem heh.
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Old May 26, 2011 | 01:17 PM
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well the sound you described is exactly what mine was doing with the mid pipe gone, and based on what I was told from multiple people on the forums my car was detonating and thats obviously a very bad thing, your car is leaning out. are you still running the twins or have you gone to a single turbo?
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Old May 26, 2011 | 01:27 PM
  #5  
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PHREN PHUN!
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From: houston, tx
still running twins. my AFR gauge doesn't show it running lean
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