Throttle Sticking on 1984 Trans Am 305 HO and other issues - Third Generation F-Body Message Boards


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Throttle Sticking on 1984 Trans Am 305 HO and other issues

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Old 11-30-2017, 03:21 AM   #1
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Throttle Sticking on 1984 Trans Am 305 HO and other issues

I purchased a 1984 Trans Am in August of this year with repairing the car in mind as it's been sitting for about 6 years and the current problems I need help with is knowing what to do about the throttle sticking as it was stuck and the car had to be put in neutral in order for it to slow down but it was fixed after shutting it off and turning it back on, the car also has the issue of stalling when being driven and I tried to fix it with replacing the fuel line with a stainless steel braided hose as well as rerouting the line next to the radiator so that it would get better cooling, this worked slightly as it would still stall but it would turn off after stutting it off and turning it on, what do you guys reccommend I do next.

Current repairs done recently:
-Rebuilt Carb
-replaced and rerouted fuel line
-replaced the majority of vacuum lines with new ones
-replaced mechanical fuel pump
-emptied gas tank and cleaned fuel line tubes within the tank
-replaced fuel filter (sock in the tank and added a new inline fuel filter)
-replaced carb spacer (gasket)
-replaced fuel pump gasket
-probably more that I cant think of right now

Any and all suggestions would be appreciated.
Thanks.
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Old 12-04-2017, 02:17 AM   #2
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

Can anyone help?
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Old 12-04-2017, 08:32 AM   #3
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

if you've added a fuel filter between the tank and the fuel pump, get rid of it. the stock one in the carb is adequate.

most common cause of throttle sticking is worn throttle shafts. if you can wiggle your primary throttle back and forth (with it cracked open so the blades are not tight in the bores) it needs to be bushed.

rule out the idle bump stop though by disconnecting it.

I'm also assuming that you've verified that the fast idle cam is not sticking
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Old 12-04-2017, 09:17 PM   #4
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

The inline fuel filter is near the carb as the stock one wasn't going to work with the new braided hose that I got.
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Old 12-04-2017, 09:41 PM   #5
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

Is your choke sticking, or not getting power?
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Old 12-04-2017, 10:34 PM   #6
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

The throttle was stuck as it kept on accelerating, so it was definatley getting power.
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Old 12-05-2017, 08:11 PM   #7
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

The choke only comes off with power being applied.

The choke is basically like a little coil of metal that expands and unfurls as it heats up (with power applied), pushing that choke flap open

If theres no power to it then it wont unwind and the choke wont release - therefore the choke will always be on
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Old 12-05-2017, 08:35 PM   #8
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

ok, what would I do to test for power then?
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Old 12-05-2017, 11:29 PM   #9
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Re: Throttle Sticking on 1984 Trans Am 305 HO and other issues

grab a test light or a multimeter and touch the inside of the little grey connector joined to the choke. if it has power you will get a 12v or a light

but next time it does it, get out of the car and look at the choke flap (the small front one, not the secondary air door)

if its closed, your choke is on (not what you want) if its pointing to the sky letting freeflowing air through then its working
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