Question about Pontiac Bonneville

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The car will not accelerate; while driving at 65 mph on highway going up hill car started to slow and stall only going about 35-40 up the hill. once over the hill the car would not resume speed and maxed out at about 40 mph. it has always taken a little while to accelerate, but since this incident it will not accelerate past 40 mph and takes a very long time to get to that point. when revving up the engine at high rpm's the car makes a grinding hissing noise while in neutral.

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  • Anonymous Mar 22, 2014

    more turned over but wouldn't kick in until I pressed gas pedal then revved high as it started.

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This sounds like 1 of 2 possible problems.
a bad headgasket or a clogged catalytic convertor. i would lean more towards the convertor

Posted on Jul 16, 2008

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Make sure that there are no obvious small diameter hoses that are torn or collapsed. look at the pcv valve area because of oil saturation and especially at the map sensor to make sure it is both plugged in and that the hose or mounting point at the intake is not at fault.... vacuum leaks cause lean codes and hesitation...

more hazardous to your engine is pinging and heating issues which could cause damage to the catalyst... could get expensive once the o2 sensors and cat go bad...

only other guess i can offer is fuel pump not putting out enough pressure but i would suspect a vacuum leak because of the hissing and symptoms you have described

Posted on Jul 28, 2012

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Save Money on Gas/Petrol


  1. Avoid idling. While idling, your car gets exactly 0 miles per gallon while starting the car uses the same amount as idling for 6 seconds. Park your car and go into the restaurant rather than idling in the drive-through. Idling with the air conditioning on also uses extra fuel. Also, avoid going so fast that you have to brake for someone. Whenever you brake, you waste the gas it took to get going that fast.
  2. Drive at a consistent speed. Avoid quick acceleration and hard braking. Cruise control will keep you at a constant speed, even when going up and down hills.
  3. Avoid stops. If approaching a red light, see if you can slow down enough to avoid having to actually stop (because you reach the light after it is green). Speeding up from 5 or 10 miles per hour will be easier on the gas than starting from full stop.
  4. Anticipate the stop signs and lights. Look far ahead; get to know your usual routes. You can let up on the gas earlier. Coasting to a stop will save the gasoline you would otherwise use maintaining your speed longer. If it just gets you to the end of a line of cars at a red light or a stop sign a few seconds later, it won't add any time to your trip. Ditto for coasting to lose speed before a highway off-ramp: if it means you catch up with that truck halfway around the curve instead of at the beginning, you haven't lost any time. In many cities, if you know the streets well, you can time the lights and maintain the appropriate speed to hit all green lights. Usually this is about 35 to 40 MPH.
  5. Slow down. Air resistance goes up as the square of velocity. The power consumed to overcome that air resistance goes up as the cube of the velocity. Rolling resistance is the dominant force below about 40 mph. Above that, every mph costs you mileage. Go as slow as traffic and your schedule will allow. Drive under 60-65 since air grows exponentially denser, in the aerodynamic sense, the faster we drive. To be precise, the most efficient speed is your car's minimum speed in it's highest gear, since this provides the best "speed per RPM" ratio. This is usually about 45 to 55 miles per hour.
  6. Use A/C only on the highway. At lower speeds, open the windows. This increased the drag and reduces fuel efficiency, but not as much as the AC at low speeds (35-40 mph). The air con - when used a lot - is known to use up about 8% of the fuel you put into your car.

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