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Code 304 misfiring #4 check engine light on. will not pass deq

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SOUND LIKE BAD SPARK PLUG,BAD IGNITION COIL.COULD HAVE DIRTY CLOGGED FUEL INJECTOR.

Posted on May 25, 2011

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Posted on Jan 02, 2017

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1 Answer

Misfire code 304


Here's a link to some help on your P0304 code. P0304 OBD II Trouble Code

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2003 sorento 3.5 cranks won't start code 300 302 304 306


The code 300 is a Random/Multiple Cylinder Misfire....a 302 is Cylinder # 2 misfire detected. ..and the same for 304 and 306..being 304 is cylinder 4 misfire and 306 is cylinder 6 misfire...All these at the same time normally is a faulty coil pack..,and or faulty coils...spark plugs.,plug wires.....It should be running horribly or barely ....However it could be internal losing compression.....It could just need a good tune up.....Disconnect battery before changing coils,wires..,or plugs in order to clear the fault codes.....

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1998 Toyota T 100 6 cyl. 2 wheel drive Autozone found Error codes 300,304,306 listed with them as: 300 multiple misfire 304 cylinder 4 misfire 306 cylinder 6 misfire Chilton's Toyota list as: 304...


I would go with the ones autozone gave to you.then I would check the coil packs for those 2 cylinders and see if that's the problem. If that ain't the problem then I would check the crank sensor

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2 Answers

Check engine light on . will not pass DEQ code po 304


hoopers51, Code 304 is for a misfire detected on cylinder #4. Check the wire and the spark plug for that cylinder. Make sure that there is no corrosion in the boots of the wire and see if the spark plug is fouled up, or wet with gas. If the plug is fouled (a normal firing plug will have a grayish color to it) clean it and replace it. If the wire is bad then replace it. Make sure that there is no corrosion on the coil terminal when you pull the wire off. You might want to test the coil if you have an inline spark tester. These can be purchased very cheaply at any auto part store. Also what you can try is to remove the plug on the #4 injector when the engine is running. DO NOT try this with the spark plug wire. (Do this when the engine is off) When you disconnect the injector you will hear a misfire if it is working properly and this will tell you that the injector is not the problem. If there is no change then you should check for power to the injector. (once again, when the engine is running) The injector on that cylinder may be weak and is leaking. This will dump too much fuel into that cylinder causing the misfire and you will have a wet spark plug. All of these, a bad wire, a bad spark plug, a leaky injector or one with no power, or a bad coil will cause a misfire and will increase the HC's on an emission test. Good luck with this.

May 25, 2011 | Plymouth Breeze Cars & Trucks

1 Answer

02 pt cruiser check engine light on rattle when accelerating code 304


CODE PO304 - CYLINDER 4 MISFIRE DETECTED. POSSIBLE CAUSE BAD SPARK PLUG .FAULTY OR STOPPED UP FUEL INJECTOR.BAD IGNITION COIL.

Nov 21, 2010 | 2002 Chrysler PT Cruiser

1 Answer

My C230 Mercedes has check engine light on. Car checked and the following codes were found: P0171 system too lean, P0300 random/multiple cylinder misfire, P0301, 302, 303, 304- meaning cylinders 1 - 4...


P0171 indicates a lean condition. The most common cause of this is a defective mass air flow sensor. Also check if any vacuum leaks.Replace MAf sensor,if cleaning the MAF does not help.
Thanks.

Sep 06, 2010 | 2004 Mercedes-Benz C-Class

1 Answer

DEQ DIAGNOSTIC TROUBLE CODE P0300 - MISFIRE - OREGON DEQ


first is up you octane with an adative or tank of has. the next would be to inspect your rotor cap for crac ks/ scale build up. if showing a lot of build up on the contacts replace cap and rotor button. Those ate the easiest and cheapest improvements. the octane boost reduces the misfire due to detonation

Oct 02, 2017 | 1999 Pontiac Grand Prix

1 Answer

What is error code po 304 and po316


P0304 is Cylinder 4-misfire detected-probable cause is as follows. Engine mechanical fault, wiring, ignition/fuel system, injector, ECT/MAF sensor, ECM

P0316 Misfire detected during startup-first 1000 revolutions- probable cause is as follows-Engine mechanical fault, wiring, ignition/fuel system, injector

Aug 18, 2009 | 2003 Mercury Sable

2 Answers

#4 cyl misfires/code 304


P-0304 indicates number 4 cylinder misfire. Are you using Toyota parts dept spark plugs? More often than not, non-toyota plugs make the v-6s run poor, right out of the box....
Try this:With the engine running, pull the connector wire off of the #4 injector. Note to see if there is any change with the idle quality. No change? You may have a bad injector.

Aug 12, 2008 | 1997 Toyota Tacoma

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