I have a customer that came in with an 84, and it will start but dies off as it is running extremely rich. The injector is dumping fuel like none other after it starts. The fuel pump is original, and I havent tested fuel pressure yet. They even tried a whole other throttle body and it does the same thing. Any ideas?

Strange. Only a few possibilites that I can think of.

glitch in ECM that is holding injector current constant. Try swapping a known good one.
return line is plugged

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" THE BLACK PARALYZER" -87GT 3800SC Series III engine, 3.4" Pulley, N* TB, LS1 MAF, Flotech Exhaust Autolite 104's Custom CAI 4T65eHD w. custom axles, HP Tuners VCM Suite.
"THE COLUSSUS"
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Is it held open constantly? Or is it pulsing?

If it's pulsing at all, check the coolant temp sensor.
If it's open constantly, it's possible that the injector driver is shorted, holding it open.

[This message has been edited by Raydar (edited 07-27-2010).]

Its pulsing, but shooting fuel that you would need at WOT. They put in a brand new computer and I checked the part number and its the correct one. Its weird. I am going to do a fuel pressure test on it this afternoon when I get some time.

Test ECM?
Use a Noid light instead of injector.
Scan ECM...
check ECM thinks have low volt. If ECM thinks it has low volt... use a DMM at ECM to test.
TPS angle = real throttle angle. (0% = idle)
ECM Coolant temp is to cold. Very Likely Problem. If so, they don't make the old sensor... Need new sensor, wire connector, and solder the splice to keep from rework. see cave, sensor quick ref, ECM section

Test the blue wire for injector for short. (Goes to White ECM connector, pin 8.) But is unlikely.

Replace ECM? See Quick Ref in L4 engine in Cave.

Test Fuel pressure? Maybe but also unlikely. 2 TBI regulator is unlike bad but return line to gas tank is block....

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)

[This message has been edited by theogre (edited 07-27-2010).]

threw a code 51

quote Originally posted by fieroX: threw a code 51

PROM error?! (from memory)

Got any bent pins on the chip?
Plugged in correctly? Make sure the notch on the chip is on the same end as the notch on the chip carrier.

[This message has been edited by Raydar (edited 07-27-2010).]

Yes, PROM error. ECM is Limp Home mode.

PROM electrical is bad but not likely... Likely PROM is:
Missing.
PROM has bent/broken pin.
PROM carrier is loose/broken.
Socket bad or has "cold" solder connection in ECM. (Replace ECM.)

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Dr. Ian Malcolm: Yeah, but your scientists were so preoccupied with whether or not they could, they didn't stop to think if they should.
(Jurassic Park)

The Ogre's Fiero Cave (It's also at the top and bottom of every forum page...)