Question about 1994 Nissan Altima

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My 94 nissan altima starts, but it has a hard idle.... it also is very slow and bogged down when i drive it. i get spark to all four pistons, ive changes the air filter, cleaned the mass air flow censor, and checked all connections from my ignition and my distributor. idk what the problem is... timing?

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  • kevdman007 Apr 25, 2010

    i have the same problem... i have a brand new CAT. and ive kept it maintained never going over 3500 between oil changes. this hard idleing and being bogged down just randomly happened less than 24 hors ago...what mechanical things could be wrong with it...

  • kevdman007 Apr 25, 2010

    i have the same problem... i have a brand new CAT. and ive kept it maintained never going over 3500 between oil changes. this hard idleing and being bogged down just randomly happened less than 24 hors ago...what mechanical things could be wrong with it...

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  • Master
  • 957 Answers

Take a step back, take a deep breath too. All right now, look at the cars maintenance history and the cars mileage. Is the car overdue for a tune-up? If the car has over 100k then you may have a clogged CAT. Perform a back pressure test to confirm. But really if can be anything, you have a good car, they are reliable but they like anything else will need something from time to time.
So do a peliminary check and see if you can find anything out of the ordinary. Rule of thumb is if the check engine light is on then the problem is electrical but if the light is off then the problem is mechanical.
Good luck. let me know how it is going.

Posted on Apr 25, 2010

  • larry blais
    larry blais Apr 26, 2010

    You know I was just reading your comment and it came to me that you may have sludge in the fuel rail. Other mechanical problems could be: A defective fuel-pump, fuel regulator, pinched fuel line, gas-tank could be vapor locked (check by taking off gas cap, do you hear a strong vacuum sound when you start to remove it?), bad wires, bad/fouled plugs, timing is off, bad gas or water in it, or maybe a blockage in the exhaust system. I hope that helps, let me know.

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