C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

1985 dont start

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Old Jun 29, 2018 | 07:13 AM
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Default 1985 dont start

I have a 1985 corvette and it wont start, when press throttle it start but work rough, i ve changed fuel pump, unplugged maf, code 33 is showing up any one had same issues ?
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Old Jun 29, 2018 | 08:58 AM
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Originally Posted by Chevy85
I have a 1985 corvette and it wont start, when press throttle it start but work rough, i ve changed fuel pump, unplugged maf, code 33 is showing up any one had same issues ?
have you put a pressure gauge on it to see what pressure you have??? Did you eliminate the pulsator when you replaced the pump.? you should not touch the gas pedal when starting an 85...flooring it puts it in "flood mode"...
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Old Jun 29, 2018 | 01:43 PM
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Originally Posted by Chevy85
I have a 1985 corvette and it wont start, when press throttle it start but work rough, i ve changed fuel pump, unplugged maf, code 33 is showing up any one had same issues ?
If pressing the gas does get it to start, I would suspect the TPS sensor may be at fault. But fuel pressure test would still be useful, at the very least to eliminate that as a probable cause.
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Old Jun 29, 2018 | 07:41 PM
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Originally Posted by TheBlaster9001
If pressing the gas does get it to start, I would suspect the TPS sensor may be at fault. But fuel pressure test would still be useful, at the very least to eliminate that as a probable cause.
i suspected in the throttle position sensor but when pressing throttle it work horrible a fuel pressure test was not done but I changed the pump and fuel pressure regulator I am worried since the car has been standing for about 6 mhonts
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Old Jun 29, 2018 | 07:45 PM
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Originally Posted by playsdixie
have you put a pressure gauge on it to see what pressure you have??? Did you eliminate the pulsator when you replaced the pump.? you should not touch the gas pedal when starting an 85...flooring it puts it in "flood mode"...
no pressure test yet but has to do it, yes I eliminated pulsarotor when replacing pump, fuel pressure looks that there is from the valve but not sure about injectors ecc since the car has been standing for about six months
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Old Jun 29, 2018 | 08:01 PM
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Originally Posted by Chevy85


no pressure test yet but has to do it, yes I eliminated pulsarotor when replacing pump, fuel pressure looks that there is from the valve but not sure about injectors ecc since the car has been standing for about six months
A fuel pressure test really is necessary here. Without it, we don't know if you have 20psi or 40 or whatever.

What octane gas was in the car? 6 months is starting to get close to the point I would suspect bad gas is at fault.

Also, you can try starting with TPS off just to see if it changes anything. A bad TPS will mainfest itself both at idle and when on the pedal.
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