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03-24-2007, 07:45 PM
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#1
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Join Date: Oct 2004
Location: SOUTH JERSEY
Posts: 581
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ANYONE KNOW IF THE TBI....
hey guys, does anyone know if the tbi from the early 90's have adjustable fuel regulators. i believe my formula is running a little lean. she backfires through the tbi. any ideas. i bought it from so dude in central jersey. the cat is cut off and open. i dont think its back pressure causeing the problem. thanks in advance for any help...
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1987 PONTIAC FIREBIRD SHOW WINNER current
1888 Trans Am GTA current
1989 PONTIAC FORMULA WS6 M5 355 sbc 501hp (sold)
1995 PONTIAC FIREBIRD M5 V6 ( sold )
1989 Trans Am GTA 5.7L 67000mi current
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03-24-2007, 10:47 PM
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#2
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Join Date: Aug 2004
Location: Hillsborough, NJ
Posts: 3,200
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Can't you tune the amount of fuel at the ECM? I have a TBI (from an 88 TA) and don't recall seeing an adjustable fuel regulator. Dunno about the 90's though.
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I USED TO HAVE an 85 Camaro 305 4bbl, 90 Firebird V6, 97 Firebird V6 (10 speakers!). Despite the two family vehicles, 3 kids, wife and mortgage, I can finally realize the dream - 88 TA almost all stock... for now.
http://www.cardomain.com/id/untameddave
Wanted this -  , but ended up with this -  for free. Can't argue with free.
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03-24-2007, 11:12 PM
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#3
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Join Date: Aug 2004
Location: Fl.
Posts: 616
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they are not adjustable from the factory but they can be made adjustable... there is a tac weld that holds a screw in place in the FPR
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Boats and hos.
Current: 1999 Jeep Cherokee Sport 4.0L
Old: 1990 Firebird Formula WS6, 1991 Camaro RS, 1992 Nissan Stanza
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03-25-2007, 07:49 AM
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#4
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NJFBOA Supporting Sponsor
Join Date: Feb 2006
Location: HULMEVILLE, PA
Posts: 2,023
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yeah what he said ^^^^^
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JSSPEEDANDCUSTOM.COM
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03-25-2007, 10:41 AM
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#5
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Join Date: Aug 2004
Location: Fl.
Posts: 616
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btw fbods4ever... that car still for sale? i called u about a month ago and wasnt able to hold the appointment we made
__________________
Boats and hos.
Current: 1999 Jeep Cherokee Sport 4.0L
Old: 1990 Firebird Formula WS6, 1991 Camaro RS, 1992 Nissan Stanza
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03-25-2007, 03:12 PM
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#6
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Join Date: Feb 2005
Location: west orange nj
Posts: 2,415
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Quote:
Originally Posted by 90FormulaWS6
they are not adjustable from the factory but they can be made adjustable... there is a tac weld that holds a screw in place in the FPR
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do you have a pic of it i want to adjust the fuel pressure on my 92 rs
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03-25-2007, 04:09 PM
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#7
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Join Date: Aug 2004
Location: Fl.
Posts: 616
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nah you can search thirdgen.org for it and theres plenty of info and pics there i believe
__________________
Boats and hos.
Current: 1999 Jeep Cherokee Sport 4.0L
Old: 1990 Firebird Formula WS6, 1991 Camaro RS, 1992 Nissan Stanza
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03-25-2007, 04:53 PM
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#8
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Join Date: Feb 2005
Location: west orange nj
Posts: 2,415
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thanks derek
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03-25-2007, 06:36 PM
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#9
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Join Date: Oct 2004
Location: SOUTH JERSEY
Posts: 581
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derek, i dont recall anything for sale... might have been someone else. i just got the car a month ago.
__________________
1987 PONTIAC FIREBIRD SHOW WINNER current
1888 Trans Am GTA current
1989 PONTIAC FORMULA WS6 M5 355 sbc 501hp (sold)
1995 PONTIAC FIREBIRD M5 V6 ( sold )
1989 Trans Am GTA 5.7L 67000mi current
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03-26-2007, 09:33 PM
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#10
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Join Date: Aug 2004
Location: Fl.
Posts: 616
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i guess you bought the car i was gonna look at... that guy send you that pic in your sig?
EDIT: If you ever have any questions about TBI, just shoot me a PM. I'm dont have any experience with modded TBI's. ha 
__________________
Boats and hos.
Current: 1999 Jeep Cherokee Sport 4.0L
Old: 1990 Firebird Formula WS6, 1991 Camaro RS, 1992 Nissan Stanza
Last edited by 90FormulaWS6; 03-26-2007 at 09:37 PM.
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03-28-2007, 02:43 PM
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#11
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NJFBOA Co-Founder
Join Date: Jul 2004
Location: All up in your kool aid!
Posts: 12,235
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you can easily make the factory regulator adjustable. unless there are some other major components added to the engine there is no real reason it should lean out at factory pressure and it is extremely unlikely that th open y-pipe would have anything to do with it.
hit me up on AIM. i still have a bunch of TBI stuff sitting around here and i prolly have a regulator i can rig up for ya.
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04-07-2007, 02:01 PM
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#12
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Join Date: Oct 2004
Location: SOUTH JERSEY
Posts: 581
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hey derek. no i found the car on craigslist and bought it. got it for 400.00. the pic is the car as it was posted on craigslist. excellent deal. the problem i found is the the guy who changed the motor in it, left the 305 chip. so its running lean. im trying to locate a caprice or impala chip. then ill see if i can get someone to delete the auto trans. so i can run with the 5 speed. thanks for the tip.
__________________
1987 PONTIAC FIREBIRD SHOW WINNER current
1888 Trans Am GTA current
1989 PONTIAC FORMULA WS6 M5 355 sbc 501hp (sold)
1995 PONTIAC FIREBIRD M5 V6 ( sold )
1989 Trans Am GTA 5.7L 67000mi current
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