fuel manafement system question

c.bakken · 1-13-08, 18:01

well i just bought my car yesturday and the guy who owned it before me put on a aftermarket fuel system and now the car is starving for fuel... im not sure why??? since i dont know much about the car or the mods that have been done to it yet im not sure where to start.

could someone tell me how to adjust the air/fuel mixture or anything else that may help?

i will post photos of the system as soon as i can, i realise its hard to figure out a problem when you cant see what you need to help someone fix.

thanks guys,
Chad

**91GTTurbo** · 1-14-08, 16:09

Congrats on the new car, what did you get?? I personally have no experience with external FMS but I'm sure it would help the group to know what BRAND of FMS is installed as well as any model numbers.

If you can ask the PO, ask all of this information as he'd be more up to speed on how to adjust the system than anyone else, providing he knew what he was doing when HE installed it.

c.bakken · 1-14-08, 22:01

sorry i forgot to include what kind of car it was...

its a 90 mx6 gt.

i dont know the brand of the set up and i could tell just by the way the guy was talking about it he had no idea what he was doing...

**1FIERCEGT** · 1-14-08, 22:10

before offering any ideas/solutions i would like to ask what leads you to the conclusion that the car is starving for fuel?

**Zach** · 1-14-08, 23:05

Quote:

Originally Posted by 1FIERCEGT

before offering any ideas/solutions i would like to ask what leads you to the conclusion that the car is starving for fuel?

Came here to say this.

c.bakken · 1-14-08, 23:38

its almost sounds like its missing. and i know that on my street bikes they are most of the time running lean. the car may be different though.. i dont know. please. correct me if im wrong.

**Zach** · 1-14-08, 23:47

Like a stuttering? I would check/replace your spark plugs, wires, disty cap and rotor. I would also check your charge pipes and throttle body boot for cracks. Take off all of your pipes and visually inspect/bend/manhandle all the rubber pieces to see if you find any cracks.

c.bakken · 1-15-08, 22:58

yeah like a harsh shutter feeling.

ill check all that.

thanks.

**Zach** · 1-15-08, 22:59

tell me one thing...does it stutter only under boost?

c.bakken · 1-17-08, 19:26

thats actualy another problem. it wont build boost at all.

**ademan** · 1-17-08, 20:10

Quote:

Originally Posted by c.bakken

thats actualy another problem. it wont build boost at all.

then you have a vacuum leak

**Zach** · 1-17-08, 20:43

Quote:

Originally Posted by ademan

then you have a vacuum leak

Or very crappy plug wires. I had this problem...I would only build 4-5psi until it would studder and not build any higher. I had a boot that was cracked in half.

c.bakken · 1-18-08, 15:20

vacum leak? where should i ckeck for it? i dont know anything about boosted engines so when it come to the turbo im completely lost.

whatnow757 · 1-18-08, 19:32

any rubber hose or boot in the engine bay that holds vacuum....throttle body boots...vacuum lines on the throttle body...stuff like that

**4cylfun** · 1-20-08, 12:18

seems like 90% of the time its the throttle body boot. I know mine has a small crack in it (n/a). I'm not really trying to push power at the moment so i dont' care so much about it but take of your boot and check it out and see whats the dilly-o

1-13-08, 18:01	#1 (permalink)
c.bakken Join Date: Jan 2008 Location: Powhatan, VA, USA Age: 20 iTrader: (0)	fuel manafement system question well i just bought my car yesturday and the guy who owned it before me put on a aftermarket fuel system and now the car is starving for fuel... im not sure why??? since i dont know much about the car or the mods that have been done to it yet im not sure where to start. could someone tell me how to adjust the air/fuel mixture or anything else that may help? i will post photos of the system as soon as i can, i realise its hard to figure out a problem when you cant see what you need to help someone fix. thanks guys, Chad

1-18-08, 19:32	#14 (permalink)
whatnow757 Join Date: Mar 2005 Location: Newport News, VA, USA Age: 29 iTrader: (0)	any rubber hose or boot in the engine bay that holds vacuum....throttle body boots...vacuum lines on the throttle body...stuff like that
	http://www.cardomain.com/memberpage/823574

1-20-08, 12:18	#15 (permalink)
4cylfun Dedicated LX to GT Guy Join Date: May 2007 Location: Plainfield, IN, USA Age: 25 iTrader: (3)	seems like 90% of the time its the throttle body boot. I know mine has a small crack in it (n/a). I'm not really trying to push power at the moment so i dont' care so much about it but take of your boot and check it out and see whats the dilly-o
	'88 Mazda MX6 LX Manual Tranny with GT goodies and a custom paint job that i need to badly work on '74 Kawasaki S1-B 250 Triple 2 stroke And last the beater, the '91 Accord EX Coupe Auto w/ half a drop lol.

1-14-08, 16:09	#2 (permalink)
91GTTurbo Join Date: Jan 2007 Location: Seattle, WA, USA Age: 32 iTrader: (0)	Congrats on the new car, what did you get?? I personally have no experience with external FMS but I'm sure it would help the group to know what BRAND of FMS is installed as well as any model numbers. If you can ask the PO, ask all of this information as he'd be more up to speed on how to adjust the system than anyone else, providing he knew what he was doing when HE installed it.

1-14-08, 22:01	#3 (permalink)
c.bakken Join Date: Jan 2008 Location: Powhatan, VA, USA Age: 20 iTrader: (0)	sorry i forgot to include what kind of car it was... its a 90 mx6 gt. i dont know the brand of the set up and i could tell just by the way the guy was talking about it he had no idea what he was doing...

1-14-08, 23:38	#6 (permalink)
c.bakken Join Date: Jan 2008 Location: Powhatan, VA, USA Age: 20 iTrader: (0)	its almost sounds like its missing. and i know that on my street bikes they are most of the time running lean. the car may be different though.. i dont know. please. correct me if im wrong.

1-15-08, 22:58	#8 (permalink)
c.bakken Join Date: Jan 2008 Location: Powhatan, VA, USA Age: 20 iTrader: (0)	yeah like a harsh shutter feeling. ill check all that. thanks.

1-17-08, 19:26	#10 (permalink)
c.bakken Join Date: Jan 2008 Location: Powhatan, VA, USA Age: 20 iTrader: (0)	thats actualy another problem. it wont build boost at all.

1-18-08, 15:20	#13 (permalink)
c.bakken Join Date: Jan 2008 Location: Powhatan, VA, USA Age: 20 iTrader: (0)	vacum leak? where should i ckeck for it? i dont know anything about boosted engines so when it come to the turbo im completely lost.