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

1991 acceleration, RPM drops

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Old Mar 1, 2014 | 03:26 PM
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Default 1991 acceleration, RPM drops

Hi guys, anyone have any idea about this? Not all the time, but sometimes during heavy acceleration, I will be shifting gears and when I go from 1st to 2nd or 2nd to 3rd, when I release the clutch and hit the throttle again, the car will lose all power and have nothing at all and then all of a sudden, the power all comes back and she has all acceleration again. It's the weirdest thing. It acts like it is starving for air for like 2-3 seconds. Any help would be appreciated! Thanks guys
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Old Mar 1, 2014 | 04:20 PM
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I would lean toward TPS first, check that out, see if it's okay.
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Old Mar 1, 2014 | 05:32 PM
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Maybe not enough fuel in tank?
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Old Mar 1, 2014 | 08:38 PM
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I had a blazer do this I changed the fuel pump.. took care of the problem.. so I would say fuel pump.. watch and see if the car turns off completely it is a pump I am sure
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Old Mar 2, 2014 | 07:12 AM
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Default Thanks a lot

I will try all of these things and see what happens. I won't be able to let you know until I get her out in the Spring, but thanks so much for the information!!
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Old Mar 2, 2014 | 12:04 PM
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Do 91s have any sort of traction control ?
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Old Mar 2, 2014 | 12:52 PM
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Originally Posted by 383vett
Do 91s have any sort of traction control ?
No, not at all
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Old Mar 2, 2014 | 02:37 PM
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How much fuel is in the tank? Sounds kind of like the fuel moving away from the pickup and starving for fuel
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Originally Posted by Audie Barber
I had a blazer do this I changed the fuel pump.. took care of the problem.. so I would say fuel pump.. watch and see if the car turns off completely it is a pump I am sure
Really? W/o running a single diagnostic test, you're that sure, huh? Wow.


After confirming that you have enough fuel in the thing, put a fuel pressure gauge on it, tape it to the windshield. When the symptom occurs, what does the gauge read?
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