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Old 07-30-2009, 01:34 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, 04:32 AM   #2
coldturbo
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Member#: 168900
Join Date: Jan 2008
Chapter/Region: NESIC
Location: Springfield, MA
Vehicle:
2002 Impreza WRX
Vf-39 Grp.N luv

Default

A few things wrong here.
If you had a defective MAF sensor and knew it that, it should have been the end of your tuning day. You will never get that engine right without the correct MAF readings.
Second if your car is not running well at low speed, beating it to high speeds is exactly the wrong thing to do and only make it worse. Do not drive the car.
What boost did you see when you got the 5k? I am guessing you have a boost leak somewhere with the FMIC piping.

Get a new MAF and have the car towed to a tuner.

Do you have a FMIC on the stock turbo? Why only 16 lbs?
Lastly you should return to stock heat range plugs.
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