1991 Chevrolet Corvette Logo
Posted on Nov 10, 2009
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1991 corvette boggs down when normal operating temp is reached.No codes and have replaced the computer

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  • Posted on Jan 08, 2010
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Hi have a 1991 vette that runs fine at high speeds and then hesatates at low idle then driving home one day car shuts off restarts for a second shuts off.seems like it is not getting fuel.now try to start car and it do's not seem like it is getting gas what do you think

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  • Posted on Nov 11, 2009
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It sounds to me as though you have a clogged or malfunctioning fuel pump. Depending on the engine in your car, and whether or not the engine has a carb or fuel injection system.

In most of the early 90's corvette's, there should still be a fuel filter on the fuel injection throttle body (it looks like a carb), and a fuel filter under the car on the fuel lines. I believe you'll want to check the passenger side, but follow the fuel lines to find the filter. You might only have one under the car, so don't be alarmed if you don't find a small one on the throttle body.

Try changing your fuel filters first, as this is an inexpensive way to make sure your vette is in optimum condition before you do anything else.

If fuel filter replacement doesn't work, you will want to have your fuel pump tested. The only way to DIY, is to remove the fuel pump from the lower drivers side of the engine and to blow in the "in" side with a little water and see if it puts out the fluid. Even at that it could still be bad, so if you pull the pump, plan on replacing it.

The only other realistic option is that your fuel injectors are dirty or the gaskets are bad and it is time for an injector overhaul. This is not to hard to DIY, but does take patience and attention. You can also try running some fuel injection cleaner through your engine before trying anything else to see if it helps.

Some unlikely options are that your smog pump is clogged, your catalytic converter might be bad, you EGR valve or Purge Valve is clogged, your timing is off and you need to check the spark system, or that you could have low compression.

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Fuel injectors is the problem I had with my 91 i changed all 8 the car runs great

  • Orestevalero Feb 26, 2011

    so how sure are you this is the injectors my cars rpms drop but it wont turn off unless ive been driving for a good amount of distance i used fuel injector cleaner you could say it helped but still seems to have the same problem other than that the car runs fine

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