THROTTLE BODY PROBLEM!! ANY ADVICE?? - Third Generation F-Body Message Boards

thirdgennewie · 09-26-2009, 10:39 PM

I Just purchased a 91 camaro rs 305 and when I start the car it runs for a good 3 seconds and then throttle body starts spitting fuel and the car shuts off , it also makes a funney noise, if you could help thankyou i need to get back on the road.

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kkingsrulee · 09-26-2009, 11:14 PM

What do you mean "Starts spitting fuel"? Are you sure the fuel pump is operating? You should be able to hear it "hum" when you put your key in the second position before you start it.

It's definitely a fuel delivery problem.

Need more input though.

thirdgennewie · 09-26-2009, 11:29 PM

yes i definetely hear a hum so i think the fuel pump is fine, but alot of fuel dumps on the top on the two butterfly valves that open when you start the car and it makes a hissing noise like air is coming out thats loud, and when i started it another time and the fuel wasnt sprayying as much and the noise was not there.

kkingsrulee · 09-26-2009, 11:40 PM

Check your vacuum lines around the TBI unit, you need to hook up a fuel pressure gauge to the fuel inlet line to the TBI unit and measure your fuel pressure.

thirdgennewie · 10-01-2009, 11:45 PM

exactlyy where do i test the fuel pressure line at? I have replaced the injectors and they spray fine now and i also replaced a heater control valve but my question is if the car is still turning on but driving like its gasping for air with a putt putt noise?? is the fuel pump still intact and can it be the fuel filter??? thanx in advance guys

1984_350_lt · 10-01-2009, 11:57 PM

check for vacume leaks,