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P0304 misfire have had tune up and still the light comes on

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Engine light code P0304

The P0304 code means that the cylinder 4 is misfiring or is ... P0304 MAZDA P0304 ... Engine Light ON? The ELM327 WiFi Car Diagnostic
OBD II Trouble Code Information and Diagnosis Engine Codes com Welcome to Engine Codes

Apr 18, 2015 | 2001 Mazda Tribute

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Random multiple misfire P0300, P0302, P0304 on 2006 Kia Rio

A competent mechanic will check all probable causes associated with these DTC codes.
Code P0300: Random-Multiple misfire detected. Probable causes:
1. Vacuum leaks, damaged hoses, or improper routing
2. Fuel contamination
3. Ignition system - Ignition module, coil, spark plugs and wires
4. Fuel system
Code P0302: Cylinder 2 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system
Code 0304: Cylinder 4 misfire detected. Probable causes:
1. Control unit software in need of updating
2. Faulty PCM or ECM
3. Faulty fuel injector
4. Ignition system
5. Fuel system

Be sure the invoice enumerates all of these probable causes as having been checked. Also, some of the replacement parts installed earlier may be faulty.

Jan 19, 2014 | Kia Cars & Trucks

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Car sort of jerks while driving and the engine light flashed then went off twice.

P0304 states: Cylinder #4 misfire
Check spark plug
Check resistance of plug wire. Should be between 6K and 8K Ohms
Check injector with a noid light.
P0316 :Misfire detected on start-up (first 1000 revolutions)

if you have many miles(80K or more) on the vehicle just save time and money now and do a tune up (all plugs and wires).

Dec 13, 2012 | Cars & Trucks

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Code 303 and 304 and check engine light plugs have not been changed 119.000 miles is it tune up time

P0303....Cylinder 3 Misfire Detected

P0304....Cylinder 4 Misfire Detected

sounds like a new set of HT leads and plugs wouldnt go amiss(fire wires) weird name that fire wires HT stands for high tension leads in proper english .

Mar 07, 2011 | Ford F-150 Cars & Trucks

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Can you please explain what code p0304 cylinder 4 missfire means and how can I fix that thanks.

p0304 means the computer has detected that cylinder 4 is misfiring. the most common cause of a misfire is a faulty spark plug or plug wire. depending on how long its been since a tune-up, they could just be worn out. you can look at where the plug wire snaps onto ignition coil to see if the coil tower is corroded, also another cause. other causes of misfire in one cylinder could be a faulty fuel injector or low compression on that cylinder. but ignition is the most common

Feb 19, 2010 | 1997 Buick LeSabre

2 Answers

What does the error code P0304 mean?

A p0304 is a cylinder misfire on number 4 cylinder. Possible causes are faulty spark plug wire, bad spark plug, or faulty ignition coil. Depending on how many miles are on the vehicle, you may just need a simple tune up.

Oct 17, 2009 | 2005 Jeep Liberty

2 Answers

HELP, MISFIRING: 1999 Audi A6 Quattro Avant Wagon

P1127 Long Term Fuel Trim mult.,Bank1 System too Rich

P1129 Long Term Fuel Trim mult.,Bank2 System too Rich

P1250 Fuel Level Too Low

P1300 Misfire detected Reason: Fuel level too low

P0154 02 Sensor Circuit No Activity Detected (Bank 2 Sensor 1)

P0300 Random/Multiple Cylinder Misfire Detected

P0303 Cylinder 3 Misfire Detected

P0304 Cylinder 4 Misfire Detected

It sounds like there is a lot going on.

Good Luck


Sep 14, 2008 | 1999 Audi A6

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