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

91 vette help?

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Old Nov 22, 2003 | 03:49 PM
  #1  
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From: smithtown ny
Default 91 vette help?

i have a 6spd and i took the car for a ride i nailed first gear felt great i hit second and at about 3500 to 3900 rpm it felt like the rev limiter was kickin in it felt like it wouldn't make any power past that rpm the car stoped pulling like it fell flat on it,s face fuel pressure is good everything is new from tune up to fuel pump you name it it's done what's up with this.??????
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Old Nov 22, 2003 | 05:44 PM
  #2  
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From: Apollo PA
Default Re: 91 vette help? (6spd)

Check the MAP sensor and the O2 sensor. :smash:
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Old Nov 22, 2003 | 06:38 PM
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Default Re: 91 vette help? (6spd)

If that doesn't show up anything have back pressure checked across the main cat and pre-cats.
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Old Nov 22, 2003 | 07:08 PM
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Default Re: 91 vette help? (6spd)

my car does that when it's low on gas, like 1/4 tank and below.

does it not rev above that rpm at part throttle and full throttle?
does it allways act this way?
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Old Nov 22, 2003 | 08:07 PM
  #5  
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Default Re: 91 vette help? (6spd)

I noticed this under WOT prior to my 7/03 mods, but haven't really checked since. At the time, I figured it was a fuel problem ie., old filter, unknown condition of stock injectors?? I haven't messed with either yet, but since you've brought it up, I'll check it out some time soon and see if it's still doing it and try to remember to get back to you. :thumbs:
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Old Nov 22, 2003 | 10:45 PM
  #6  
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Default Re: 91 vette help? (65Z01)

i just have the resonator i have tpis long tubes the oxygen sensor is new and it is a heated one. the fuel injectors are new, fuel filter i did have a little less than a half a tank of gas but when i hit around 3900 rpm it felt like someone hooked a house to my bumper thats how bad it was the car wants to go alot more but i can't find the problem
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Old Nov 23, 2003 | 12:26 AM
  #7  
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Default Re: 91 vette help? (6spd)

If excessive back pressure isn't the problem and fuel is ok, consider installing a HyperTech coil/cap/rotor.
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Old Nov 23, 2003 | 10:06 AM
  #8  
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Default Re: 91 vette help? (65Z01)

i have a msd coil new cap,rotor and the msd button that goes in the distributor cap to match the coil. now what???????
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Old Nov 23, 2003 | 10:09 AM
  #9  
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Default Re: 91 vette help? (65Z01)

like i said i just have the resonator and i have muffler eliminators so mt headers to my eliminators are free flowing except the resonator is there any way i can check for a clog or anything else????
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Old Nov 23, 2003 | 10:37 AM
  #10  
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From: Manhattan
Default Re: 91 vette help? (6spd)

an exhaust shop can check the pressure before and after the main cat to tell you if it's clogged.
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