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85 Iroc broke down had to get towed

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Old Mar 9, 2012 | 09:08 PM
  #51  
davidjr74's Avatar
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Car: 1985 Camaro Iroc
Engine: 350 tpi
Transmission: 700r4
Re: 85 Iroc broke down had to get towed

Put new fuel pump on. (turns on it works)
Got a new alternator (old alternator's bearing was going bad).

very close to finishing. The alternator pulley is hitting that brace for some reason and I'm trying to adjust it.
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Old Mar 9, 2012 | 09:32 PM
  #52  
jpossibul's Avatar
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Joined: Sep 2011
Posts: 58
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From: Tennessee
Car: 1985 Black and Gold Trans Am
Engine: 305 Tuned Port Injection
Transmission: T5 Borg Warner Manual 5-speed
Axle/Gears: 3.08
Re: 85 Iroc broke down had to get towed

Well, if you don't have success with that, check out the fuel pressure regulator. Those go out and leak, you can smell gasoline fumes under the hood. Plus, it won't hold enough pressure to the injectors and they (injectors) are very sensitive that way. (They absolutely have to have enough pressure or it won't work.) Also it could be a fuel injector. And sometimes when the fuel pump relay is bad and the oil pressure sensor goes out at the same time, it can cut off too. Something about how the oil pressure sensor is like a back up circuit link if the fuel pump relay goes out - they designed it that way to get you home in a pinch. I'm not a a mechanic, just sharing some things that I've run into while working on mine. Mine turned out to be a bad injector.
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Old Mar 10, 2012 | 02:26 PM
  #53  
fireburdluvr85's Avatar
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Joined: Apr 2007
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From: wallingford,ct
Car: 91 formula ws6
Engine: 355 tpi OBDII
Transmission: 4l60E
Axle/Gears: 2.73 with 4th gen brakes
Re: 85 Iroc broke down had to get towed

definately sounds like a mickey mouse job. not you but the previous owner. tpi uses high pressure and the proper pump should be installed. sounds like a carbed car swapped over.
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Old Mar 11, 2012 | 11:46 AM
  #54  
davidjr74's Avatar
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Car: 1985 Camaro Iroc
Engine: 350 tpi
Transmission: 700r4
Re: 85 Iroc broke down had to get towed

Originally Posted by jpossibul
Well, if you don't have success with that, check out the fuel pressure regulator. Those go out and leak, you can smell gasoline fumes under the hood. Plus, it won't hold enough pressure to the injectors and they (injectors) are very sensitive that way. (They absolutely have to have enough pressure or it won't work.) Also it could be a fuel injector. And sometimes when the fuel pump relay is bad and the oil pressure sensor goes out at the same time, it can cut off too. Something about how the oil pressure sensor is like a back up circuit link if the fuel pump relay goes out - they designed it that way to get you home in a pinch. I'm not a a mechanic, just sharing some things that I've run into while working on mine. Mine turned out to be a bad injector.
Where is the fuel pressure regulator located?
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Old Mar 11, 2012 | 04:21 PM
  #55  
jpossibul's Avatar
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Joined: Sep 2011
Posts: 58
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From: Tennessee
Car: 1985 Black and Gold Trans Am
Engine: 305 Tuned Port Injection
Transmission: T5 Borg Warner Manual 5-speed
Axle/Gears: 3.08
Re: 85 Iroc broke down had to get towed

It is linked in between the fuel rails underneath the plenum and runners.
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Old Mar 12, 2012 | 08:38 PM
  #56  
davidjr74's Avatar
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Car: 1985 Camaro Iroc
Engine: 350 tpi
Transmission: 700r4
Re: 85 Iroc broke down had to get towed

Can't believe its almost been a month ....wtf.

anyhow I got my new alternator installed and no cigar. I am getting no fuel pressure fml.

Battery is not dead. Getting 11.8 volts.
Fuel Pump is turning on
Getting spark
Getting voltage to my fuel injectors.

No fuel is getting through my lines....I hope its just a blockage (or maybe I tightened the hoses too tight on the fuel pump if thats possible?) or something simple. Not another faulty fuel pump.

I has the worst of luck.

edit: also have still not checked fuel pressure regulator. Something else I need to learn about.
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Old Mar 12, 2012 | 10:10 PM
  #57  
Ozz1967's Avatar
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From: St. Cloud, MN
Car: 1984 Trans Am
Engine: LS1383 in work
Transmission: Magnum F - to be installed
Axle/Gears: Zexel Torsen 3.73, 28-spline mosers
Re: 85 Iroc broke down had to get towed

Originally Posted by davidjr74
Can't believe its almost been a month ....wtf.

anyhow I got my new alternator installed and no cigar. I am getting no fuel pressure fml.

Battery is not dead. Getting 11.8 volts.
Fuel Pump is turning on
Getting spark
Getting voltage to my fuel injectors.

No fuel is getting through my lines....I hope its just a blockage (or maybe I tightened the hoses too tight on the fuel pump if thats possible?) or something simple. Not another faulty fuel pump.

I has the worst of luck.

edit: also have still not checked fuel pressure regulator. Something else I need to learn about.
Ok, you've verified electrical. Spark, voltage, fuel pump.

Disconnect your fuel line at the fuel rail. Get a gallon pail or gas can. Turn on your key to activate your pump, fuel should spray out at however many PSI your pump/regulator is set to. If it doesn't, thenyou've got a blockage in the fuel line.

An alternative method is to use an air compressor and blow air back down the line toward the tank. You should hear bubbling in the tank. do this for both the return line and main feed line. Should hear bubbling in the tank if they are clear.

IF you hear bubbling, then both lines are clear and your issues are from the fuel rails to the motor.
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Old Mar 13, 2012 | 07:45 PM
  #58  
davidjr74's Avatar
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Car: 1985 Camaro Iroc
Engine: 350 tpi
Transmission: 700r4
Re: 85 Iroc broke down had to get towed

Thanks for your help ozz. I am getting absolutely no fuel pressure and there isn't any blockages...another defect fuel pump.

Anyhow I guess this is a sign. I had my car towed off to a mechanic and requested to get a in-tank fuel pump and this thing wired to the relay. I wanna get this thing properly hooked up the way it needs to be. Maybe all these defect parts were a sign. At least I tried

thanks for your help fellas.
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Old Mar 20, 2012 | 07:52 AM
  #59  
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Car: 85 Z28 T-Top 36mm sway & wonderbar
Engine: TPI L98 350 W/85 Vette Stage II ECM
Transmission: W/C T-5, alum drive shaft
Axle/Gears: 9 bolt posi, 3:27, PBR's, BB LS1's
Re: 85 Iroc broke down had to get towed

There ya go!!!
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Old Mar 20, 2012 | 08:04 AM
  #60  
Zaar's Avatar
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Joined: Apr 2011
Posts: 49
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From: Delaware
Car: 1988 Iroc-Z tpi 5.7
Engine: ls2
Transmission: 4l80e
Axle/Gears: 3:42
Re: 85 Iroc broke down had to get towed

replace the battery, if its tpi check the regulator and hook up your gauge to the schrader test port on the fuel rail at this time then key the ignition to have the pump pressurized in lines if the filter in line is clogged or pinched as you indicated check the run and see if you have a kinked or manipulated line, if you have pressure at the rail you have fuel pressure your regulator could be bad also that pump requires at least 12 v to operate properly i know from current draw how many electrical apparatus items can burn under loading voltage specs and creates a strain on components.
check these items...
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