The P0304 indicates the #4 cylinder is misfiring. The flashing light means the cylinder is not firing at all...It could be several things causeing it, coil, wires, plug, injector or vacuum leak. Do not drive your vehicle until you have this repaired, as it will lead to further more costly problems. Good luck, i hope this helps.
could it be the coil pack i need to know how would the car run if it is indeed the coil pack?
You did not say what engine you had, some VUEs have a Coil-over-plug system, others have a front and rear bank system...and yes 1 individual coil can go bad. The coil can be tested with an ohm meter to see if it is within specs. Or you can remove the #4 plug and inspect it. If it's wet and gas soaked, that would indicate no spark. If it's dry and light colored, that would lead to a lean, or lack of fuel problem. I have seen the Vue's develop intake manifold leaks that cause unmetered air to be sucked into the cylinder and create a misfire. A technician with a good scanner that knows how to read it, can determine this, along with the other possibilities i mentioned.
4cyl 5 speed 2wd. Out of no where this problem occurred i was driving 2 days ago and the check engine light came on and is blinking on and off the service light came on but goes off for awhile and comes back on! When i take of the car seems to lag in power and while i am stopped or when i first start the car it shakes never had this problem before after 40mph it runs just fine under the 40mph it runs rough. Like i said i replaced the boots and spark plugs erased the codes but it still comes back on the (ses) light so not sure whats going on thats y i ask if it could be the coil pack?
oh yea and it has 163,000 miles i do standard oil changes and changed the driver side wheel bearing about 2months ago other than that i have had it a lil over a year with no major prolems i have put 20,000miles on it myself.
Absolutely, your Vue has no power because it is only running on 3 cylinders, that is why it's shaking also. The coil pack can be tested, no need to spend $120.00 to replace it if that is not the problem. All too often. owners spend a lot of money and still have the same issues. By first correctly diagnosing the problem the proper repairs can be determined. I have seen the intake manifolds leak on these Vue's on more than one occasion, and it seems to be the last thing that is checked. That is why i mentioned it...I hope this helps, and good luck with your Vue.
One other thing that is often overlooked and should be checked is the catalytic converter. They clog and put too much backpressure on the engine. Your mileage is an indication that this needs to be checked.
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Check for poor electrical connection to the fuel injectors.
Look for sign of fuel leak (wet hose) around the fuel injectors.
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lack of fuel (clogged injectors)
or
intermittent connection to injectors will trigger lean / P030x code.
In your cause, it's cylinder #4
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Check fuel pump pressure if you has over 160,000 miles.
Most electrical fuel pump will fail after 160K.
A failing fuel pump will stop pumping when the tank is below 1/4.
Keep the tank above 1/3 and do a short test drive.
Im still confused as to what it is exactly i mean can the coil pack make the car shake if its back or act like its going to stall when stopped?
My response is about fuel issue (aging fuel pump).
Please fill the tank to 1/3 or high and see does it has the same stalling when stop issue.
A failing fuel pump will not able to pump fuel effectively below 1/4 tank in a HOT day.
Coil pack is the spark generator to each plugs.
Let's rule out fuel issue before spend $ on swapping parts.
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I have a 2003 Saturn vue and last night after running fine all day I started it up and the engine light started blinking on and off and it was shaking and running real rough in idle or stopped it seemed like it wanted to stall what could this be
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*I mean when it is bad!
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