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Old 07-30-2009, 02:38 AM   #1
robinbrd311
Scooby Newbie
 
Member#: 212207
Join Date: May 2009
Chapter/Region: NESIC
Location: Lexington
Vehicle:
2004 Impreza WRX
Java Black Pearl

Default Advice Needed for a recent problem with turbo

A few months ago I had to get my maf sensor retuned be cause there was a System Too Lean engine light and the car would knock around 4-6k rpm because the MAF sensor was not working correctly. The Dent Sports Garage in MA simply retuned the sensor and it worked properly up til now.

I drove my car to NY, a 3 hour drive, and it worked fine. On the way back I was accelerating quickly after a toll and the car lagged in each gear around the higher rpms. Every time after that when I had to accelerate to highway speed from a stop the same thing would happen but worse. When I got home the car was in the condition where if I started from first and floored it it would go to a bout 4 or 5k rpm then either stop there or knock and lag a lot and the engine light would flash until I shifted, and the same thing would happen in 2nd gear. (Didn't get to 3rd gear on my street)

I am guessing it is a problem with the MAF sensor again but before I go in and pay for them to work on it I was wondering if anyone knew anything about this.

2004 WRX, Cobb short ram intake, turbo XS front mount intercooler, one step colder spark plugs, tuned at dent sport 15psi boost
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Old 07-30-2009, 03:09 AM   #2
burtonrider
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Member#: 145644
Join Date: Apr 2007
Chapter/Region: NESIC
Location: milan nh
Vehicle:
02 rwd impreza wrx
silver

Default

is your check engine light on cause mine did the same thing when my intake got wet the code was for maf high input
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Old 07-30-2009, 11:36 AM   #3
shampy2k
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Member#: 202848
Join Date: Feb 2009
Chapter/Region: NESIC
Location: Brockton, Ma
Vehicle:
05 Sti
silver with silver wheels

Default

could it be the one step colder plugs? I thought those where for cars with 100 plus hp over stock.
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Old 07-30-2009, 12:04 PM   #4
mattminer
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Member#: 90642
Join Date: Jul 2005
Chapter/Region: NESIC
Location: Pineapple under the Sea, RI
Vehicle:
WKD Everything

Default

defintely sounds like a dirty or broken maf, maybe improperly scaled but that souns kind of extreme for a maf thats only scaled a little wrong.

M@
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Old 07-30-2009, 01:38 PM   #5
MYfirst00
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Member#: 22928
Join Date: Aug 2002
Chapter/Region: NESIC
Location: Fitchburg, MA
Vehicle:
2011 WRX
Satin White Pearl

Default

Get a replacement MAF. If you're getting knock, it's because the engine is trying to compensate for faulty MAF readings. I just went through this. P0171. Bren read my live readings and my air was all out of whack at all load levels, and causing knock. Swapped the MAF, completely normal. No issues since. There were no MAF codes, which threw me off the trail for about a month.
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