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Misfiring all four cylinders - 2004 Pontiac Vibe

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Might need a good set of plugs or coil pack

Posted on Nov 30, 2012

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It run badly when cold once warm it runs ok. I have replace coils. Plugs and fuel fliter. The codes are. P300 p301 p302 p303 p304 misfire help please


Is it a 4 cylinder engine, and all four cylinders are misfiring?

Misfires will set a code when the computer senses a lag in power output from a cylinder, based on the input from the crank position sensor. Misfires are usually caused from a loss or a problem with gas, spark, or compression-one of those three is wrong for a misfire to occur. New coils and plugs, so probably not a spark problem-unless the spark timing is wrong-let's leave that for now. You should have the fuel pressure tested, and see if pressure is as specified. If pressure is low, and you have new filter, probably a weak pump.

Check cylinder compression as a last resort. Your lowest reading cylinder should be within 75% of the highest reading cylinder. A compression test is a good indicator of the internal health of the engine, the higher the compression, the more power output from that cylinder. But it should be even and balanced, lowest should be within 75% of the highest reading.

So, gas, spark, or compression?

Mar 10, 2015 | Cars & Trucks

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Misfiring on cylinder #3


Misfiring can be cause by ignition coil,spark plugs,wires,engine valve,cylinder compression,
if it's a quad four then crack around the ignition coil. there is 2 coils like 1-4 coil and 2-3 coil
first check spark plug color or foul of gaz
hope it help

Oct 18, 2014 | 2002 Pontiac Grand Am SE

1 Answer

: "My 2005 jeep liberty 4x4 v6 3.7L is coming up code 304 (misfire in cylinder 4). What could this be? I've changed the coil packs & the spark plugs. My check engine light is continuing to come on. Does...


One possibility for a misfire, when you have spark on a cylinder, is that the cylinder may have low compression and thus very poor power. This will cause a slight stumble in the engine which is picked up by the crank sensor as a misfire. Check the compression on the number four cylinder and compare it to the others. All cylinders should have approximately the same compression You could have a burnt valve or worn valve seat.

Sep 15, 2014 | Cars & Trucks

1 Answer

Check engine flashing


this usually indicates a cylinder misfire. Two things you can do.

1. remove the coils or wires one at a time until you find the cylinder that is not working. Than inspect the components on the cylinder (plug, wire, coil, etc)

2. scan the computer for codes. You should get a P030X (the X will be a number 1-6 depending on what engine you have). whatever number is shown is the cylinder that is misfiring. for example P0304 would be a number four cylinder misfire, P0302 would be a number two cylinder misfire.

Dec 05, 2011 | 1998 Honda Accord

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Misfire #4 p0304 engine is sluggish.rough idle at times


Check the coil, a good test is to change the coil with another cylinder and see if the misfire moves to that cylinder, if it moves then you will know its the coil make sure to mark it so you know which one to replace, this is very common for coils to go bad, heres a diagram to help you locate #4 cylinder.couldnt get diagram but if its a four cylinder then #4 is the last one back if its a 6 cylinder then it will be the first cylinder on the driverside .first cylinder from the front to rear,

Dec 12, 2010 | 2005 Ford Escape

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Firefire in cylinder four / random misfires


Its not likley to be an injector fault.the air mass meter is far more common.if you unplug it it defaults to a average value and should improve the way it runs if that is the problem.

May 20, 2009 | 2003 Volkswagen Passat

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