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On my chrvy HHr ss 08 I keep getting a code for misfire on #4 cylinder. I have replaced the plugs the coil for that cylinder also the varable advance solinoids and the light still comes on. it at first it start as temperature cooled when using the remote start which has work flawless. what am I missing here???

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  • Cars & Trucks Master
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What engine does it have ? 2.0, 2.2 , 2.4 L ? could have bad injector, vacuum leak . Do you have battery voltage at the coil on pin 4 pink wire with black strip ? Get a spark tester or put screw driver in the plug wire end hold near ground and have someone crank over the engine .Is there spark ? yes ? no Do you have a good ground at pin # 1 black wire ? pin two is a ground in side the ECM , pin 3 is a control signal from PCM to turn the coil on an off ! I Have had these with bad connection at coil cause miss- fires !

Posted on Dec 14, 2014

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2 Answers

I have rough idle and 0304 code on a 1999 Volvo v70 xc what's wrong?


code is for misfire on cylinder 4 , may just need the plug cleaning or may need a new coil pack , plug lead , or more advanced diagnostics to get to the exact cause

Jun 11, 2015 | 1999 Volvo V70

1 Answer

Number 3 and 4 are not firing from coil on 2002 subaru outback 2.5


its faulty coil.

Get the compression test done on each coil.these will let you know if its faulty coil or not.

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It can be issue with spark plugs or faulty spark plugs. Also get the compression test done for cylinders. If any of cylinder shows low compression then required, then that particular cylinder will cause misfire.

Also get obd codes scanned, the error code will let you know which cylinder is misfiring or all cylinders are misfiring.

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For your trouble shooting I suggest you to refer the help oinks below. It has step by step details for many engine misfire issues.

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Click the link below:-----


Ford Explorer Cylinder Misfire?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-cylinder-misfire.html

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Engine Misfire codes on Chevrolet Malibu?

http://schematicsdiagram.blogspot.com/2011/12/engine-misfire-codes-on-chevrolet.html

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Cylinder 6 Misfire?

http://howtobyme.blogspot.com/2011/12/cylinder-6-misfire.html

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Misfire on cylinder 4?

http://schematicsdiagram.blogspot.com/2011/12/misfire-on-cylinder-4.html

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While stop engine idles like cylinder missing?

http://schematicsdiagram.blogspot.com/2012/01/while-stop-engine-idles-like-cylinder.html

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Ford Explorer 5.0L: Engine Miss?

http://whoisbyme.blogspot.in/2012/06/ford-explorer-50l-engine-miss.html

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Oil on spark plugs and car misfires?

http://technoanswers.blogspot.in/2012/02/oil-on-spark-plugs-and-car-misfires.html

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Can cylinder misfire Damage the Catalytic converter?

http://schematicsdiagram.blogspot.in/2012/02/can-cylinder-misfire-damage-catalytic.html

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Car misfires and error code P0306 and P0303 is shown?

http://technoanswers.blogspot.com/2012/01/car-misfires-and-error-code-p0306-and.html

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Chevrolet K1500 No spark, random misfire

http://repairhelpcenter.blogspot.com/2012/11/chevrolet-k1500-no-sparkrandom-misfire.html

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2004 Ford F150: Engine Misfire and Lean Code?

http://whatisbyme.blogspot.in/2012/05/2004-ford-f150-engine-misfire-and-lean.html

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1995 Toyota LS: Misfire at idle or low RPM

http://whatisbyme.blogspot.in/2012/04/1995-toyota-ls-misfire-at-idle-or-low.html

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Toyota Corolla: Random Misfire?

http://technoanswers.blogspot.in/2012/04/toyota-corolla-random-misfire.html

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2006 Ford Freestar: Misfire on Cylinder Number 2?

http://whatisbyme.blogspot.in/2012/06/2006-ford-freestar-misfire-on-cylinder.html

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This will help.

Thanks.

Nov 28, 2012 | Cars & Trucks

1 Answer

Random misfire and smoke coming out of tail pipe


could be a bad injector swap it with another cylinder

Oct 14, 2012 | 2008 Chevrolet HHR SS

1 Answer

MY 04 KIA SEDONA KEEPS SAYING MISFIRE IN CYLINDER 1 AFTER I'VE CHANGED THE WIRES, PLUGS, COIL PACKS 2X, ALL 4 LIFTERS AND THE FUEL INJECTOR. WHY? AND WHAT AM I DOING WRONG? THANK YOU IN ADVANCE.


Fire it up at night and look for arcing in the dark. It may also be nothing more than number 1 plug wire misrouted in a way that inductively picks up energy from one of the other coil packs or cylinders. It should cross other plug wires only once.

Dec 27, 2011 | Cars & Trucks

2 Answers

I have a 2001 toyota fourrunner showing computer codes p-0300 & p-0304. What are these codes for?


The P0300 is a random multiple misfire code, the P0304 is specific to the number 4 cylinder, a common problem for this code is a igniter/coil malfunction on the #4 cylinder, each cylinder has it's own coil, what you can do is to remove the #4 coil pack(it's the middle one on the driver's side) and switch it with coil #2 which is the first one on the driver's side, clear the codes and drive it if the code now shows P0302 replace the coil.

Aug 21, 2011 | 2002 Toyota Sienna

1 Answer

Car keeps giving p0303 code.


Code P0303 means that there is a misfire detected on cylinder #3. This could becaused by anything from a worn out spark plug to a blown cylinder head gasket, a faulty fuel injector, a bad ignition coil, or a leaking intake manifold gasket. I have also seen this type of code caused by clogged-up EGR ports in the intake manifold on certain engines. "Freeze Frame Data" stored in your Engine computer along with the fault code is designed to help identify what engine conditions (high speed/slow speed, heavy load/light load, etc.) are producing the misfire. This helps a lot in identifying exactly what is causing the cylinder to misfire.

One way to eliminate some of the possible causes is to swap parts with another cylinder to see if the code changes.

If you have "Coil-On-Plug" ignition, you can swap the coil on #3 cylinder with the coil on #4 Cylinder and swap the #3 spark plug with the #2 spark plug. Then clear the codes and drive the car till the Check Engine (or Service Engine Soon) light comes back on.

If it still gives you P0303, then it is not being caused by the plug or the coil. It could be any of the other possible causes listed above.
If it now gives you P304, replace the bad ignition coil that is now on #4 cylinder.
If it now gives you P302, Then replacement of all the spark plugs is recommended.

Dec 26, 2010 | Chrysler PT Cruiser Cars & Trucks

1 Answer

2003 mercedes Benz C240 codes P0300, P0301, P0302 and P0303. Please, help me how to fix?.


P0300 Random Misfire Detected
P0301 Cylinder 1 Misfire Detected
P0302 Cylinder 2 Misfire Detected
P0303 Cylinder 3 Misfire Detected
according to this fault codes first mark ignition coils
3 ---------------- 6
2 ---------------- 5
1 ---------------- 4
RB-------------LB
this right banks and left bank, please remove Ignition coils with lids and spark plugs from right bank and swap with left bank, if fault code change as
P 0304 Cylinder 4 Misfire Detected
P 0305 Cylinder 5 Misfire Detected
P 0306 Cylinder 6 Misfire Detected
You can Identify it's a faulty ignition system then next swap ignition lids from ignition coils be careful each coils have two lids one short and other long bit deference and when you remove and fix it to the car keep in mind correct order because each coil two different fire for two spark plugs don't mix up, if you mix it can create the fault code.if you detect any fault ignition coils or spark plugs or lids replace that and also whether god or bad recommend to replace spark plugs, find the right that's most important thing, if this way couldn't found the any ignition fault next step is check fuel presser, when the engine running fuel presser must be around 4.5 bar without engine running must be 4 to 6 bar if the fuel presser too low need to check two different things one is fuel pump other is fuel injectors, in this case you can swap injectors from right bank to left bank and find is the injectors leaking, if not leaking faulty fuel pump.is this information helped you? if yes please leave a comment,

Oct 15, 2010 | 2007 Mercedes-Benz C230 Sedan

4 Answers

5.3 L Missing and Rough Idle Intermittently


i have a 2001 chevy z-71 5.3L. I keep getting a random/multiple misfire code for cylinder 1 . I have replaced plugs, wires, coil pack(only on #1 cylinder)., and fuel pump. I still keep getting the cylinder 1 misfire code. I put truck on a scanner and watched the cylinders. # 1 misfires at idle but quickly stops misfiring at around 1000 rpms. you can here the engine miss at idle but truck runs great on road . anyone else ever had this problem?

May 05, 2009 | 1999 Chevrolet Silverado 1500

2 Answers

99 cougar v6 P0352 misfire cylinder 3 and 4 replaced igntn coil..


Had the same problem, car was misfiring on cylinder 3 and 4. replaced wires, plugs, and ignition coil. still misfired on the same cynlinders. turned out the main engine wiring harness plug in was coming loose. spent well over $150 on the unneccesary repairs and ultimately fixed the problem wit a $3 bag of wire ties to hold the plug in...

May 04, 2009 | 1999 Mercury Cougar

2 Answers

Check engine light on


I have the same problem, have swapped coils, injectors, plugs and replaced plugs w/ new ac delco iridium plugs. I have flushed out the fuel rail 3 times and tried adding seafoam, iso heet and berryman's B-12 chemtool to the tank over the last 15- 20 tanks of gas. I have also wasted money and cleaned the mass air flow sensor. NOW I FEAR THAT THE CATALYTIC CONVERTER IS GOING BAD DUE TO THE MISFIRES! (smells like sulfer/rotten eggs at times.)There is a service bulletin for contaminates and water in the fuel. It states that the fuel rail is a non-return type. This means that any water or contaminates in the fuel will enter the rail and stay there inturn clogging the injectors. The bulletin states that this causes the misfire on cylinders 1 and 4 during right and lefthand turns. So why is it only P0304 and never P0301? The dealer will charge you 300.00 to flush the injector rail. The problem is compounded by the fact that there is no fuel filter on the HHR except the one in the tank. Evidently that is not good enough to keep contaminates from reaching the fuel rail. I am going to drop my fuel tank and drain all the fuel from the system and refill w/ top tier fuel from a top tier station. Search for top tier fuel on the web. If it comes back again, I am going to get a ford focus. I can't keep worrying about this nonsense. Too bad too because I really like my HHR. Reliability is more important to me now, after all this time and money.

Oct 20, 2008 | 2006 Chevrolet HHR

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