Wired

iTrader: (3)

Hey guys,

So my car has been experiencing very high long term fuel trims (averaging around 15% with peaks up to 24%. I have not had any check engine lights. Car seems to drive just fine but does not get the greatest of gas mileage (23.5 mpg). Car will boost to 19 psi maximum. I tried installing a K&N SRI and the car would run horrible. After finding two leaks on my charged side (the factory charge pipe and the brake booster vacuum fitting) and repairing both (new pipe and gasket maker on the vacuum line) the car continues to have high fuel trims.

The entire thread of this problem and my attempted solutions is here: https://www.cobaltss.net/forums/prob...n-fail-299671/

I am measuring this all with my Bluetooth OBD adapter and the torque app for android.

The car is 100% stock at this time other than what appears to be GMS1 (I have the sensors and all the stickers).

Car was bought used with 24000 miles on it from a Ford Dealership in Tacoma.

SO my question is since none of my leaks have solved the problem and I have boost leak tested extensively without finding a leak, I wonder if someone tried tuning the car unsuccessfully or whether I am on a stock tune with 3bar sensors, or whether something is wrong with the stage one tune that would cause these trims.

If someone is skilled with a tuning program I would really appreciate the help trying to log the car to see if anything is abnormal. I would rather not take this to the dealer as the three in my area are full of idiots. If nothing else works I will be taking it to the dealer in Bellingham, WA.

I am in the Everett, WA area.

THANKS!

Wired

iTrader: (3)

Bumpage

NWAE Cobalt

iTrader: (1)

Vince - trifecta performance

footballplaya3k

iTrader: (1)

Yeah I don't know of any tuners around Washington.

CudaJoe

iTrader: (1)

Anyone live close to him so he can read your LTFTs with his OBDII scanner? It will help validate his scanner as being accurate plus give him some evidence to the dealership showing his high LTFTs are not considered "normal"

SalvageBaltSS

iTrader: (13)

There is Wongs Performance Engineering in Vancouver Wa. He does lsx cars. Really knows them well. Give him a call, I belive he uses hptuners, and can tune ecotecs.
(360) 695-9433

CudaJoe

iTrader: (1)

Thats a ~ 2 hr drive :/ Well I would visit my tuner in the Poconos which was like 6Hrs round trip so I guess thats not bad

SalvageBaltSS

iTrader: (13)

its not bad at all. I-5 at 70mph passes fast lol

Wired

iTrader: (3)

From my place it is actually almost four hours one way. I wish I had the time. Thanks for the suggestions though.

I'm going to see how the car is after i get it back from the dealer and then ill see about Z Sport in everett. Anyone heard of it? I see it everyday on my way to work.

SalvageBaltSS

iTrader: (13)

Actually I went up to Everett, couple weekends ago, it does take about 4 hours, hit traffic in seattle at 9 oclock at night.