Question about 2004 Hyundai Santa Fe

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After a hard rain my 2005 santa fee sputters until warning up then it`s fine.found a code on it po306.A cylinder 6 misfire.I was reading other peoples same problem one like mine they changed there crank shaft sensor.When dry it runs great only has 56,000 on it

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Could also be a bad wire or water splashing onto ignitor causing the misfire

Posted on Oct 02, 2010

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Engine misfires. Battery dead/fixed. Po303 code: Changed plugs/wires, code cleared/reappeared. Misfiring again. Po420 code/then cleared. Po306 code. Replaced coil tower. Misfired again..


You either have a bad catalytic converter causing too much back pressure or you are running rich. I think cylinder 3 and 6 are on the same side of the engine (except opposite banks) right? Locate the fuel pressure regulator. Is it on the same side? I've seen those go bad and allow fuel to be sucked into the vacuum line causing a rich condition/ misfire on two or three cylinders on that side of the engine.

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Why won't my car start?


P0300 multiple misfire
P0302 misfire cylinder 2
P0306 misfire cylinder 6

Apr 25, 2015 | Cars & Trucks

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2003 acura tl error codes po301 po302 po304 po306 p1399 po300


PO300 and P1399 are random cylinder misfire detected.
PO301 cylinder 1 misfire
PO302 cylinder 2 misfire
PO304 cylinder 4 misfire
PO306 cylinder 6 misfire
I would say that you have damage to the ignition wiring harness or you ECM is failing.

Feb 17, 2015 | Acura Cars & Trucks

1 Answer

Po306 misfire 6 cylinder


It happens a lot on all make new vehicles. Its called a "dead" cylinder. Must do an ohm meter test on all injectors and the code is saying it's #6 so that injector should read a good bit less than the others. If so, replace the injector and you should be good. If all injectors read the same on testing, then do a compression test. This will show #6 cylinder compression is less than the others with all spark plugs out for the test. If so, you must do a valve job on #6 in particular. The exhaust valve is burnt. I dislike being the bearer of bad tidings, but such is life in the automotive world. Best of luck on that first test my friend. I hope it's just the injector.

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1 Answer

Santa fe sputters from idle


There are a few thing that could cause this to happen, the first thing is that you need to make sure the check engine light is not on, if it is or not still have the computer scanned for any codes, the computer is always watching the operation of the engine and if there is a problem it will store a code and turn check engine light on to warn you of the problem, the code will come out as a set of letters and numbers and tell you were the problem is. it will not tell you whats wrong but just the component that is failing and then with some testing the problem can be found.

the sputtering you speak off could be due to a coil that is bad and causing engine to misfire, or even a vacuum leak or spark plug.
There are many auto part stores that will scan the computer for free and give you the codes, start by having the codes read and then write me back with the codes. Here is an example of a code, let say code po301 cyl 1 misfire , came up as one of the codes.

As you can read it tells you that cylinder # 1 is misfiring, then we would check the coil for that cylinder and the sprak plug first.

make sure to get the complete code, good day.

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2 Answers

2004 trailblazer code po306 and we changed out plugs, coil and still po306


Diagnostic Test Code (DTC) P0306 is defined by SAE J2012 (REV, DEC 2007) as "Cylinder 6 Misfire Detected".

To put it plain and simple, there is a problem with cylinder #6 in your engine that is causing it to misfire.

Misfires can be caused by several things. One of the things that must be understood is that a misfire is simply one or more cylinders that are not producing the power that they should. - especially when compared to other cylinders in the same engine.
The things that can cause this include, but are not limited to:
> Ignition system
> Fuel delivery system
> Fuel injection system
> Cylinder compression (which can be affected by many of the things below)
> blown head gasket
> Burned or bent valves
> Vacuum leaks
> Faulty wiring
> cracked piston or broken piston rings
> Restricted exhaust
> malfunctioning Powertrain/Engine Control Module (PCM or ECM)


To fix the code, you must first diagnose to determine which of these things is causing the misfire, then repair accordingly.

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Ford 2003 escape codes readed


Cauases or fault codes are not cut and dry, but here are the possible causes of codes P0316 and P0306 which are related codes.
P0316 - Engine Misfire Detected on Startup
Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Engine fails to start
- Engine runs rough Possible causes - Crankshaft Position (CKP) sensor harness is open or shorted
- Crankshaft Position (CKP) sensor circuit poor electrical connection
- Faulty Crankshaft Position (CKP)
- Ignition System
- Fuel Injectors
- Running out of fuel
- Fuel Quality
- Faulty Engine Control Module (ECM) P0306 - Cylinder 6 Misfire Detected Symptoms - Engine Light ON (or Service Engine Soon Warning Light)
- Lack/loss of power
- Hard start
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Possible causes - Faulty spark plug 6
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- Ignition coil 6 harness is open or shorted
- Ignition coil 6 poor electrical connection
- Clogged or faulty fuel injector 6
- Injector 6 harness is open or shorted
- Injector 6 poor electrical connection
- Improper spark plug 6
- Insufficient cylinder 6 compression
- Incorrect fuel pressure
- Intake air leak

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2 Answers

Misfire on number 6. changed spark plugs and coil, still reads misfire on number 6


What vehicle?

Spark plugs never misfire, by design, Wear yes,that stresses the
ignition modules

If you have a coil, that is for all cylinders,the others fire okey !

We need your year,engine, V6, V8, etc, to help

You never change parts to solve any issue
That is called wishing,hoping,pushing,poking,

What code # did you get PO306?

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Plug, plug wire, plugged or open fuel injector. are the most likely.

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