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1992 pontiac trans am tpi issues

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Old Dec 2, 2019 | 10:22 PM
  #1  
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
1992 pontiac trans am tpi issues

i have a 92 ta with the 5.0l v8 tpi
number 3 injector seems to be flooding the cyl with fuel
ive replaced everything ecm, prom, injectors, dist, coil and module, egr valve, map, tps,iac
but still have number 3 flooding
im sure it has to be wiring but why only number3
if you have any ideas pleas let me know

Last edited by tcntx; Dec 3, 2019 at 10:23 AM.
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Old Dec 3, 2019 | 07:35 AM
  #2  
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From: Chasing Electrons
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Engine: check
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Re: 1992 pontiac trans am tpi issues

Does the #3 cylinder spark plug light-off?

RBob.
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Old Dec 3, 2019 | 08:25 AM
  #3  
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From: Moorpark, CA
Car: '91 GTA, '92 T/A Convertible
Engine: GTA: 350 w/Vortec heads, T/A: 305
Transmission: Pro-built 700R4
Axle/Gears: GTA: 3.27, T/A: 2.73
Re: 1992 pontiac trans am tpi issues

Originally Posted by tcntx
i have a 92 ta with the 5.0l v6 tpi
i have a 92 ta with the 5.0l v8 tpi


There, fixed it for you.
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Old Dec 3, 2019 | 10:22 AM
  #4  
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

yes
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Old Dec 3, 2019 | 10:25 AM
  #5  
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

yes you did
but it was no help and off topic
would you have any actual information that would be helpfull
or are you just on here to be a smart ***?
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Old Dec 3, 2019 | 10:55 AM
  #6  
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From: Moorpark, CA
Car: '91 GTA, '92 T/A Convertible
Engine: GTA: 350 w/Vortec heads, T/A: 305
Transmission: Pro-built 700R4
Axle/Gears: GTA: 3.27, T/A: 2.73
Re: 1992 pontiac trans am tpi issues

Dude, I was just messing around, but since you want to be a jackass, GFY.
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Old Dec 3, 2019 | 12:35 PM
  #7  
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Car: 1991 Formula
Engine: 305 TPI
Transmission: 5-speed
Re: 1992 pontiac trans am tpi issues

Hello there, there is an article about excessive fuel in cylinders for 5.7 TPI in justanswer (website), which seems to point to a timing issue. It's a long article, you may want to check it out. Perhaps it helps.
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Old Dec 3, 2019 | 02:34 PM
  #8  
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

Originally Posted by blacksunshine'91
Dude, I was just messing around, but since you want to be a jackass, GFY.
if you feel that way ok
I just figured someone of your standing on this site would be more helpfull
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Old Dec 3, 2019 | 02:38 PM
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Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: 1992 pontiac trans am tpi issues

The injector wiring can't do this - it would have to flood all cylinders on the same bank. The wiring has +12v to the injectors at all times, and they are wired 1/3/5/7 to one injector driver, and 2/4/6/8 to the other driver. So if it were wiring, all the injectors on the odd bank would also be flooding their cylinders...... unless....

There could be something really special going on where there's an open in the control ground from that specific injector and the injector side of the open circuit has grounded out on the engine somewhere leading to that injector being open all the time.

Unplug all the injectors and the ECM and ensure that the ground side wiring of each injector is open (infinite resistance) on your meter.

GD
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Old Dec 3, 2019 | 06:17 PM
  #10  
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

any idea where to get the right wiring diagram at
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Old Dec 3, 2019 | 06:24 PM
  #11  
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1992 pontiac trans am tpi issues


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Old Dec 3, 2019 | 10:39 PM
  #12  
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

so if im reading this right
all 4 injectors 1357 are connected back to the ecm on one wire ?
467 dk blu to bc11 on the ecm connector
so theres only one wrie to check on that side
and thanks for the info
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Old Dec 7, 2019 | 08:23 AM
  #13  
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From: Adrian, Mi, USA
Car: 1988 Pontiac Firebird Formula
Engine: 5.7 TPI
Transmission: 700R4
Re: 1992 pontiac trans am tpi issues

Originally Posted by tcntx
so if im reading this right
all 4 injectors 1357 are connected back to the ecm on one wire ?
467 dk blu to bc11 on the ecm connector
so theres only one wrie to check on that side
and thanks for the info
Correct. May want to look at the splice where the wires from the injectors come together. If there is a wiring issue, that would be the first place I would check.
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Old Dec 9, 2019 | 10:18 PM
  #14  
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

thanks for the help everyone
working great
running smooth
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Old Dec 10, 2019 | 10:16 AM
  #15  
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1992 pontiac trans am tpi issues

What was the cause ?
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Old Dec 10, 2019 | 12:29 PM
  #16  
tcntx's Avatar
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

a bad brand new injector
and a broke injector wire i caused
and if i read it right i should be using 19 to 21 lbs injectors in my 5.0??
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Old Dec 10, 2019 | 12:35 PM
  #17  
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From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: 1992 pontiac trans am tpi issues

19lb for stock 305 programming.

GD
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Old Dec 10, 2019 | 01:38 PM
  #18  
tcntx's Avatar
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

do ya know whear to get a good set as cheap as possible
i just put a new set in jan but have had one already fail
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Old Dec 10, 2019 | 01:44 PM
  #19  
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Car: 1967 Camaro, 91 z28
Engine: Lb9
Transmission: M20
Axle/Gears: J65 pbr on stock posi 10bolt
Re: 1992 pontiac trans am tpi issues

You get what you pay for, cheap is not the answe for injectors.
contact southbay08
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Old Dec 10, 2019 | 02:06 PM
  #20  
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From: Huntsville AL
Car: 88GTA
Engine: 5.7TPI
Transmission: Auto
Axle/Gears: 3.27
Re: 1992 pontiac trans am tpi issues

https://www.southbayfuelinjectors.com/

They are on here. Mention 3rdgen and get a discount. Around $160 Bosch III's. Or just get some other ones.
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Old Dec 10, 2019 | 02:40 PM
  #21  
tcntx's Avatar
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From: cut and shoot texas
Car: 1980 Z28/1991 Z28
Engine: 305 / 350
Transmission: 5spd std/ th350
Axle/Gears: 3.42/ 3.42
Re: 1992 pontiac trans am tpi issues

thank ya bob
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Old Dec 11, 2019 | 01:00 PM
  #22  
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From: Portland, OR
Car: 86 Imponte Ruiner 450GT, 91 Formula
Engine: 350 Vortec, FIRST TPI, 325 RWHP
Transmission: 700R4 3000 stall.
Axle/Gears: 9 Bolt Torsen 3.70
Re: 1992 pontiac trans am tpi issues

Southbay Bosch III injectors require tuning (in my opinion, and I'm not the only one). They have no published voltage offsets which complicates the tuning process. You can get Delphi's that are direct replacements but they aren't nearly as cheap. As with many thing you do get what you pay for.

GD
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Old Dec 13, 2019 | 09:27 AM
  #23  
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From: Lansing, MI
Car: 1988 IROC-Z
Engine: 5.7 TPI
Transmission: 700R4
Axle/Gears: 3.45
Re: 1992 pontiac trans am tpi issues

Originally Posted by GeneralDisorder
Southbay Bosch III injectors require tuning (in my opinion, and I'm not the only one). They have no published voltage offsets which complicates the tuning process. You can get Delphi's that are direct replacements but they aren't nearly as cheap. As with many thing you do get what you pay for.

GD
Agreed, I have Bosch III's and don't have as smooth as idle as I would like. PO installed them before I bought the car. If I was purchasing, I would buy the Delphi's. South Bay is excellent to work with and really supports our platform.
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