Question about 2006 Pontiac Grand Prix

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Stalling out The engine seems to stall as you try to accelerate. It feels as a cylinder may be dropping out. Can this be the coil packs breaking down?

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  • wsm2576 Jan 16, 2009

    How can I diagnosis coil failure? No lights indicate a problem and nothing scans.

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One indication of the Coil failing,,is the car will idle nicely,,but will **** out when under hard acceleration.
This can also be caused by non functionaing alternator,,and dead battery.

Posted on Jan 16, 2009

  • Alex M
    Alex M Jan 30, 2009

    The car will need to be put on a scope to check the coil output voltage.
    a cheaper way might be to go get a used coil and try installing that.


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Just purchased an au ute on gas drives ok for about 20 or 30 kms then stalls in gear and backfires when you accelerate even slightly


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have the fault codes read to check for coil pack problems or ignition control module or problem position sensors breaking down from internal heat ( indications of stalling and back firing)

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The car hesitates when idling or stopped at light/ stop sign, and the rpm drops to zero then goes back up.


The battery was a red herring - it would not have anything to do with the problem.
Faulty spark plugs could cause a miss but probably not make the engine stall.
What you described is a classic example of a faulty idle air control valve or a dirty throttle body. The computer controls idle speed by regulating how much air enters the intake. It opens the control valve to raise idle speed when necessary.
I would check the control valve and the throttle body.

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My 1996 Chevy Camaro was running fine, up until last night. About halfway through my normal commute (70 miles), the gauges started bouncing all around and then the car stalled while driving. Pulling...


Hi

If your car stalled while you were driving it, look for an obvious reason first. Check to make sure you have fuel in the tank (if your gas gauge is working). Do not sit there and crank the car over, trying to get it to start, as you will quickly wear down the battery if it's not already bad.
Check the probable causes for this kind of problems:-
Ignition
The ignition system is composed of: ignition switch, neutral safety switch, security bypass, plugs, wires (if applicable) and a coil, or in the case of coil-over systems, many coils. The ignition is also tied into the computer. The crank and cam sensors tell the engine where top dead center is. Though these sensors do not usually cause a no start, if they break, the computer will go into "limp home mode," which allows you to get the car to a service station. The car will run badly, and may stall out on you. If the plug wires, plugs or coils are bad and are causing the engine to misfire, the engine will run rough. This may also cause the car to stall when driving. Generally, it will start back up, but it may be difficult to keep the car running.
Fuel
The fuel system is composed of a fuel pump, fuel filters, and fuel injectors or a carburetor. Some cars have a throttle body---this looks similar to a carburetor and has only one or two fuel injectors in the middle of it. The injectors feed all of the cylinders. In a multi-port system, each cylinder has its own injector. Should the fuel pump go bad, the car will stall while you are driving, as no fuel is getting pumped up to the engine. Bad injectors in a multi-port system will make the car run rough, which can cause a stalling situation, but generally, the car will restart.
Other Problems
There are other problems that can make a car stall---in the ignition system, the fuel system or in the drivetrain. If the timing belt breaks, the car will stall. If the computer itself stops working, the car will stall. Neither item will allow a car to start back up until it is repaired.All vehicles have an idle air motor or valve. The idle air is governed by the computer and changes the idle. When you turn on the air compressor, you use some engine resources. This makes the idle speed on the engine drop. The computer senses this drop and sends information to the idle air to turn up the idle so the car does not stall. If this part breaks, when you slow down to a stop or to turn a corner, the car may stall.
Because the running of a vehicle is complicated, there are many more things that can cause a vehicle to stall. These are the most common things that can cause a car to stall. Other things include wiring, fuses, relays, other sensors not working properly or at all, a bad alternator or a bad battery, or an overheating problem, just to name a few.

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1 Answer

When driving my car, the car will not accelerate past 15-20mph no matter how hard i push on the gas pedal. likewise, after driving 5 or so feet the car will blink the battery light and stall out on me. i...


does it feel like the transmission slips because lots of trans. when they fail loose all but 1st gear and reverse.this should be the area you have checked.

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1 Answer

My vehicle stalls on acceleration


Check that the intake is clear, no blockages(ie paper in the intake or a blocked air filter) if clear feel the coil, is it very hot? Does it only happen when the engine is at operating temp? Coils break down under heat and you loose spark under load(ie acceleration) or maybe you have a blocked fuel filter or pickup filter in your tank which would cause fuel starvation! These are the areas to investigate!

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1 Answer

Starts fine, smell fuel, rough idle-missing.


have you tried testing your ignition coils, there's 3 of them in a pack, i've had to change a couple when my lumina euro was running badly.
the coils send the spark to the spark plugs, if you have a bad coil, the cylinder won't fire. which would explain the gasie smell. a bad coil will also contribute to loss of acceleration, power and a rough idle.
the coil are rather cheap, about $20cdn each. usually one is dead and the others are good.
to test if your coils are working, what you can do is...
- start your car - unplug one cable and replace it and listen for a change in sound in the engine. if there is a noticable change in sound then that cylinder is working. - if you unplug a cable and nothing happens, and plug it back in and nothing happens, that coil is dead. you will have to replace it (one coil powers two cylinders, each independantly. one cylinder on a coil may work while the other is dead).
*please remember to unplug and replace a cable one at a time. and while doing this don't touch the metal framing of your car, our you'll get a nice zapp.
this is a cheap and easy way to test you coil pack. my friend spent about $1000 and 3 mechanics and they never checked the coils. i did, and didn't cost him a thing.

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2 Answers

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More than likely , I hate to say, it is the coil packs. If the plugs were fouled it would not change to running fine after warm up. If you do change the coil packs, change the plugs while you are in there.

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