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I have a 1990 Firebird 305 5.0L v8 throttle body, symptoms…

Customer Question
I have a 1990 Firebird...
I have a 1990 Firebird 305 5.0L v8 throttle body, symptoms are:
It won't crank without starting fluid.
Will not idle, you have to pat the gas to keep it running and you can't hold the gas or it will stall. Will only stay crunk a 1/2 second otherwise. AND the check engine light is NOT on. Only code I could pull was 53- system voltage too high.
Parts I have replaced:
TPS
Fuel Injector
Fuel Pump
Please tell me you know what's wrong.
Submitted: 2 years ago.Category: Pontiac
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Answered in 9 minutes by:
2/24/2016
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago
Amedee
Amedee, Pontiac Technician
Category: Pontiac
Satisfied Customers: 28,316
Experience: ASE certified Technician advanced level specialist. Wisconsin certified emissions state inspector
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Hello and welcome! My name is ***** ***** I can assist you with your question. Have you checked the fuel pressure?

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Customer reply replied 2 years ago
No.
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

You might want to do that. The fuel could be leaking into the engine causing this stalling condition. Or you may not have enough fuel pressure for some reason even with the new fuel pump.

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Customer reply replied 2 years ago
Ok. Is there anything else?
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

YES, TPS, EGR, air/vacuum leak, MAP/MAF sensor, IAC motor or even the PCM.

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

I see that you have replaced the TPS.. this is good.

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Then I would check for air/vacuum leaks next.

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Oh, last but not least, the pickup inside the distributor assembly can go bad causing this condition as well.

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Customer reply replied 2 years ago
Oh also I tested my injectors and one read 12 volts the other read 0... what does that mean.
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

How did you check the injectors?

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Customer reply replied 2 years ago
With an ohmmeter.
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Ok, well if you tested it correctly, then at least one is out of specs. However, didn't you replace the injectors?

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Customer reply replied 2 years ago
Only one.
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Actually, it sounds like they are both bad. Should have 16-17 ohms per injector at room temperature.

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Customer reply replied 2 years ago
We have checked everything. And nothing has fixed our issue. We did find that the distributor was cracked and rusted over. Bought a new one hoping maybe it was the problem but no it wasn't. It still won't crank without starting fluid and it won't idle. We found out when we put the injectors on the rubber seal ring didn't go on right and leaked a small amount of gas but that small amount of gas caused it to idle on its own. So what does that mean?
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

If the engine runs on starting fluid then we know it has spark and compression at the right time. This just means we have a "lack of fuel". You could have bad gas don't feel pressure or injectors are not opening up preventing fuel from getting into the engine.

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Customer reply replied 2 years ago
we need to do a ruel pressure test?
Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Yes that would be a good thing to do next

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

.

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

Hello! It's Amedee from just answer.

I am just checking in to see if you need any further assistance?

Let me know!

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Pontiac Mechanic: Amedee, Pontiac Technician replied 2 years ago

.

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