Question about 2005 Audi A4

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2005 Audi A4 1.8T QT, cylinder 4 misfire p0304

About two days ago, my 2005 Audi A4 1.8T QT started to misfire. The car would shake and hesitate, mostly noticeable at idle but also during driving. Check engine came on and got it checked at autozone and came back as P0304, cylinder 4 misfire (vacuum leak on engine). I changed all four spark plugs and the problem is still there. And the coil packs are only a year old. I also put into fuel injector cleaner, it may be a vacuum leak but I looked and didn't see anything, but maybe I'm not looking at the right hoses?

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  • hihtaer Sep 30, 2009

    I should add it has 65,000 miles and it's a manual transmission.

  • hihtaer Sep 30, 2009

    Also which cylinder is which? I am not sure what cylinder is the number 4.

  • hihtaer Sep 30, 2009

    Also which cylinder is which? I am not sure what cylinder is the number 4.

  • hihtaer Oct 17, 2009

    Well I figured out that it was a coil-pack. It solved the problem but now have it misfiring again, maybe the other coil-packs have failed also.

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I too have the same problem on my 2005 1.8t B6. I noticed a hole in the breather hose coming off the valve cover that runs to another port under the intake manifold. I have the hoses on order and should be here on Wednesday. I'll post again if that fixes my problem.

Posted on Oct 12, 2009

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Have Audi A6 Quattro have codes p0346,p0391 ,p0304,p0306,p0305,p0300 runs rough stalls makes a lot noise now power


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P0391:Camshaft Position Sensor 'B' Circuit Range/Performance Bank 2
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WHY AUDI A4 1.8 IS MISFIRING AND SHAKING


If the check engine light is on? Take it to your local parts store for a free diagnosis. Usually it needs a tune up,spark plugs, cap and rotor if applicable. I don't do audi very offend but this is a start. good luck!

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2003 SATURN VUE SERIVE ENGINE SOON LIGHT IS BLINKING ON AND OFF RAN THE OBDII READER AND CODE P0304 CYLINDER MISFIRE CAME UP I CHANGE SPARK PLUGS AND BOOTS BUT CAR STILL DRIVES ROUGH SHAKES AND WHEN PARKED...


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.

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Got a p0304 code come up on my 2002 olds Bravada, replaced camshaft and it still didnt fixed it?


P0304 Code - Cylinder #4 Misfire Detected
A P0304 code means that the the car's computer has detected that one of the engine's cylinders is not firing properly. In this case it's cylinder #4.

Symptoms may include:
* the engine may be harder to start
* the engine may stumble / stumble, and/or hesitate
* other symptoms may also be present

Causes: A code P0304 may mean that one or more of the following has happened:
* Faulty spark plug or wire
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* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
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* Defective computer

Possible Solutions:
If there are no symptoms, the simplest thing to do is to reset the code and see if it comes back.

If there are symptoms such as the engine is stumbling or hesitating, check all wiring and connectors that lead to the cylinders (i.e. spark plugs). Depending on how long the ignition components have been in the car, it may be a good idea to replace them as part of your regular maintenance schedule. I would suggest spark plugs, spark plug wires, distributor cap, and rotor (if applicable). Otherwise, check the coils (a.k.a. coil packs). In some cases, the catalytic converter has gone bad. If you smell rotten eggs in the exhaust, your cat converter needs to be replaced. I've also heard in other cases the problems were faulty fuel injectors.


Hope helps.

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Poor performance, hesitation, sluggish and shaking


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Do you let the tank go to empty before refueling a lot?

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1 Answer

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It sounds like there is a lot going on.

Good Luck

Brian

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