99 GT Running Lean?

luis84 · April 27th, 2009, 11:20 PM

My 99 GT (Stock V8 engine, with a vortech on top)... lately has been running lean on one side, just one side. It's throwing the check-engine and the code says exactly that, running lean, after running some tests everything checks out (The mass air flow sen. etc). So I changed the 02 sensors obviously assuming one of them was at fault, but no change...

It's still running really lean on one side, that's the only real symptom. Obviously it feels likes it's missing going into gear which is not the clutch it's a sub symptom of the fact that it's not utilizing fuel properly on one side, the entire fuel system (fuel pump) etc is functioning properly...

Does anybody have an idea what I should check next? I think it's a sensor probably... but i'm not sure where to go from here...

Willy Mo · April 27th, 2009, 11:23 PM

injectors all firing? any ones clogged? i had the same problem on my old fox but it was in the computer.

luis84 · April 28th, 2009, 01:02 AM

All the injectors are okay...

but there is an idea... maybe the computer, although I'd of thought when i connected it to the diagostic if the computer was bad, it would of somehow informed me ... hmmm ...

Trick Tuners · April 28th, 2009, 12:42 PM

Fuel Trims are off bank to bank - Trick Tuners Forums

April 27th, 2009, 11:20 PM	#1
luis84 Newbie 1999 S/C GT, 2004 GT 10.01 Join Date: Jan 2009 Location: Richmond, VA Posts: 3 iTrader: 0 reviews	99 GT Running Lean? My 99 GT (Stock V8 engine, with a vortech on top)... lately has been running lean on one side, just one side. It's throwing the check-engine and the code says exactly that, running lean, after running some tests everything checks out (The mass air flow sen. etc). So I changed the 02 sensors obviously assuming one of them was at fault, but no change... It's still running really lean on one side, that's the only real symptom. Obviously it feels likes it's missing going into gear which is not the clutch it's a sub symptom of the fact that it's not utilizing fuel properly on one side, the entire fuel system (fuel pump) etc is functioning properly... Does anybody have an idea what I should check next? I think it's a sensor probably... but i'm not sure where to go from here...

April 27th, 2009, 11:23 PM	#2
Willy Mo MM Fanatic 2002 Mustang GT Join Date: Sep 2008 Location: MO Posts: 4,368 Blog Entries: 1 iTrader: 2 reviews	injectors all firing? any ones clogged? i had the same problem on my old fox but it was in the computer. __________________

April 28th, 2009, 12:42 PM	#4
Trick Tuners MM Fanatic KB'd GT Join Date: Nov 2006 Location: San Diego Posts: 4,467 iTrader: 3 reviews	Fuel Trims are off bank to bank - Trick Tuners Forums __________________ Check out my forums for stuff on troubleshooting, tuning, etc We teamed up with Socal Performance Racing to bring dyno tuning to San Diego. Be friends with us on FB

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April 28th, 2009, 01:02 AM	#3
luis84 Newbie 1999 S/C GT, 2004 GT 10.01 Join Date: Jan 2009 Location: Richmond, VA Posts: 3 iTrader: 0 reviews	All the injectors are okay... but there is an idea... maybe the computer, although I'd of thought when i connected it to the diagostic if the computer was bad, it would of somehow informed me ... hmmm ...

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