Question about 1985 Toyota Celica

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Misfire on cylinder 4

Engine runs bad computer said misfire on 4 gave a code p0304 b

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1985???? are you sure????

Posted on Sep 25, 2009

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Posted on Jan 02, 2017

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2001 buick century P0304 step on gas engine light starts flashing


P0304 is engine misfire #4 cylinder Several things can cause a misfire #1 electrical which you have covered #2 Mechanical Test engine compression is should be around 150 cranking and 120 running . internal valve train components can cause bad compression and the valves then self. #3 fuel injector can be the cause suggest swapping with a know good cylinder and see if misfire follows injector.

Aug 19, 2014 | 2001 Buick Century

4 Answers

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
* Faulty coil (pack)
* Faulty oxygen sensor(s)
* Faulty fuel injector
* Burned exhaust valve
* Faulty catalytic converter(s)
* Running out of fuel
* Poor compression
* 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.

Apr 09, 2011 | 2002 Oldsmobile Bravada

1 Answer

1997 altma codes p0304,p0325 thanks mike


p0304 misfire on cylinder #4
p0325 knock sensor circuit

Could be a bad wire, plug, or coil pack on cylinder #4 (or bad distributor connection).

Knock sensor indicates a knock coming from the engine, perhaps from cylinder #4.

This may lead to a diagnosis if you change parts related to cylinder #4.

Good luck.

Jul 06, 2010 | 1997 Nissan.5 Altima

1 Answer

Im working with a 2006 mini cooper and engine light comes w po304 code the car runs fine no misfire at all,plugs r new


Code P0304 Indicates a misfire in cylinder 4. The computer will notice these long before they get bad enough for the driver to notice. Check your plugs and plug wires for thightness. I know from expierence that "New" parts does not mean "Good" parts.

If you have access to a scan tool still.... swap the #1 and #4 plugs and if you still get a P0304 reading you know the misfire is likely in the #4 cyl. wiring. (A faulty injector could cause a misfire but it's less likely a culprit than the wiring)
If you get P0301 code after you swap the plugs.. then you'll know it's a faulty plug.


sorry for the long winded advice.

May 19, 2010 | 2006 Mini Cooper

2 Answers

Engine light just came on took to auto zone they gave me this code PO304 Trying to see what it is


A P0304 OBD2 code is "cylinder #4 misfire detected". The first place to start is your spark plugs. 1. Check condition and for wear. 2. check the spark plug wires or coil packs(depending on which you have).

Feb 27, 2010 | 2005 Jeep Liberty

1 Answer

Car want pulls hills or any inclines vey well 2005


P0304 code is a cylinder 4 misfire. If the plugs or wires are bad it will cause a decrease in power. I suggest changing the plugs and wires and see if that helps.

Jan 24, 2010 | 2005 Kia Rio

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