Question about 1999 Pontiac Grand Prix

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My car loses power sometimes and I can have the pedal on the floor. What causes this? I have new spark plugs and wires, fresh air filter good engine oil life. (1999 pontiac grand prix 3.1 v6)

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  • Pontiac Master
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Could be many things but,i would put my money on a weak fuel pump.Check your fuel pressure it should be 41-47 psi with key on engine off.If its not within these specs replace pump and filter.

Posted on May 24, 2011

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  • 3 Answers

I had the same car and it was the catalaic converter i hope that helps

Posted on May 28, 2011

  • altonturnerj May 28, 2011

    How did you fix it and what exactly was wrong with it?

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Hi i have a honda hrv 2001 4x4 am losing power when accelerating a need to drop down gears to gain power ?


It sounds like you may have a engine that is losing compression, or there could also be a vacuum leak. Also faulty spark plugs and/or wires can cause a loss of engine power. And the last, but often the easiest to fix, is change the air filter. Check the air filter first.

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My kia runs fine for a lil' while, but then no matter what speed I'm trav. it starts cutting back with the excellarater pressed to the floor it loses power. But it never cuts all the way off


It could be a fuel problem, ignition problem, or something else. I would start by checking fuel pressure with a fuel pressure gauge, which you can rent or borrow from autozone. If pressure is at spec for your car, not likely a problem with the fuel pump or fuel filter. Maybe the engine is starving for air, so check the air filter, and replace if dirty.

You should also have a scan done for possible trouble codes. Any codes you get must be investigated for being related to the engine problem.

If spark plugs are old and worn down, you may just need a new set of spark plugs. Also feel the plug wires for cracks or brittleness. A bad ignition coil can get hot and then stop working correctly. Just some possibilities.

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1989 s-10 2.5 liter,when engine starts,the spark plugs become "fuel fouled"what causes this?


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I put a new battery in the car. cleaned air filter got new spark plugs and wires but it still continues to cut out when i give it gas. Even when the pedal is all the way to the floor. when i drive it it...


try checking the fuel pump and have someone test the fuel pressure to see if ur getting enoung to the engine. if the problem still occours ill be here

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Loss of power when it rains.


If your air filter is not fresh, the difference in the weather conditions actually causes the air filter to restrict the flow of air into the engine just enough that the super sensitive system you are driving notices it.

There are also other sensors that pick this up causing a performance change in the operating system. If your filter has recently been changed then of course other than being soaked with water in freezing temperatures, this shouldn't be a factor. Just a consideration:

this is also a sign of the car going into the "limp" operation and could also be caused by something getting wet, such as the ignition system. Double check your seals and panels that block moisture from your engine components. Wiring can be sprayed with sealers to help in preventing excessive moisture if your wiring is showing any age.

Good Luck

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I think i have to get my clutch bled because their might be air in the clutch is this why my ford ranger 1988 tries to bog down i replaced the spark plugs but sometimes the wire for the spark plugs come...


Just use a pliers and squeeze the metal prong inside plug wire. the wires are all one size, sometimes the power is so great, it pushes the wire off. So, just squeeze the metal prong inside plug wire and it will give you a tighter fit.

If your truck is bogging, it may be due to dirty fuel filter, dirty air filter, or clogged exhaust.

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Internal combustion engines requires 3 things... fuel, air, and spark. You do not have enough of one or more of these. If the wires and plugs are old, change them.  Air filter, same thing.  Fuel filter can also clog up with stuff after awhile. When you take a look at the air filter check where the air comes from.  It is possible a little critter has built a home and blocked the air flow (rare, but, it has happened).

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have the catalytic converter checked

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Have a 91 geo metro. losing power. sometimes down to 35mph. someone suggested adding lucus. what do you think


There could be lots of reasons. You need several things mechanically to make the engine work: fuel, air (compressed), and an ignition source (spark).

Without getting too technical, check the basic things first. Are the spark plugs clean and not broken? Are the spark plug wires hard and possibly cracked or are they nice and soft the way they should be like new wires? Is the carb or fuel injectors clean? Is the air filter dirty? Is the fuel filter clogged? Are the fuel lines/connections leaking?

Check those basic things first.....then move onto more complicated things next.

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