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Fireing problem, misfireing on # 6 cly, installed new plugs, checked coil 'ok' has black sut on plug,, no compression.

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  • Cars & Trucks Master
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This is known as major engine damage. Prepare to either rebuild a cylinder head if your lucky, rebuild or swap an engine if your not. Depends on what lies inside. Only way to tell is a leakdown test on the bad cylinder or to tear it open. If you aren't good with rebuilding machinery, leave the job for a pro to Di right the first time.

Posted on Apr 18, 2015

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1 Answer

P0303 cylinder 3 misfire


If # 3 cylinder has spark at the plug it must fire if the following conditions apply. Injector is supplying fuel to the cylinder. and cylinder compression tests OK . So check above ,one or both must be at fault.

Jul 17, 2014 | 2003 Ford Ranger Regular Cab

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Have a missing on 08 f150 4.6 went to auto zone and got a code reading and it said probable cause is a sludge throttle body/air flow got cleaner for it and clean throttle body but it still misses some one...


it is possible for it to be a coil, the thing with fords are that it takes alot of time for the misfire counter to turn the check engine light on and at the smae time set a code for missfire, if you have a code reader available check to set if there is a po301-po302 -po303,and so on the p is for power tran the o is that it is a generic code 3 indicateds misfire, 01,02 indicate which cly. is misfiring , alot of time you have to drive the fords for awhile before it will set a misfire code. if you have a good scan tool you can go to mode 6 and check misfire counters for which cly. is missing. than you can check compression in that cly, chec coil and plug.

Oct 30, 2013 | Cars & Trucks

1 Answer

Mazda mvp 03 spark plugs #5 and #6 are not firing. I pull the conector at idle and nothing. Ive cleaned and checked the injectors. New spark plugs. Ive checked fire, fuel and compression. All seems...


no the bad oxygen sensor never affects misfire it affects only the air/fuel mixture
those are causing misfire (a bad coil, ignition module, distributor pickup, crank sensor,).
and i doubt the
crank sensor cuz computer says sensor even if it said to be o2 but no its the crank one its ok if computer fault
i hope my answer was useful

May 30, 2011 | 2002 Mazda MPV

2 Answers

I keep getting code num 1 cly miss fire i have changed the spark plug wires fuel injector the coil omes out ok what else am i missing


A compression test should be taken at least of the # 1 cylinder to be certain that there is no mechanical mis-fire, and if the compression is good then the ignition module located under the ignition coils is most likely faulty or there could be a missing tooth on the tone ring for the crankshaft sensor. That is the DTC P0301 that you are having a problem with?




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Nov 07, 2010 | 1996 Oldsmobile LSS

2 Answers

What do these trouble codes mean po306 cyclinder misfire detected .how do i fix the problem?


it means you have a misfire on the number 6 cylinder

this could be caused by a whole lot of reasons.

start by inspecting for a bad plug wire if it has them

check for fire on the cylinder with a spark test tool from local part store

if it is a coil-on-plug set-up, check the coil for fire

replace coil/plug wire as needed, replace boot on coil if coil needed, replace spark plugs

Oct 11, 2009 | 1998 Chevrolet Blazer

1 Answer

Car runs rough when warm an accelerator is applied normal


P0306 is a misfire on cylinder number 6. The fact that you have oil on those plugs may or may not be causing it. The oil on the plugs is because of a leaking "internal" valve cover gasket. First thing I'd do is change the valve cover gaskets. Audi will murder you if you want them to do it (I've heard of people quoted $700 or more for this job). It's VERY easy to do. You can order the gaskets from www.ecstuning.com or www.purems.com for about $25 per side. I'd change them for sure, as they're a known issue on these cars.

Now, if your new plugs and changing the gaskets (and cleaning up of course) doesn't fix the misfire, you need to swap coil packs around and see where the code goes. The coil packs are the three parallel items on the top front center of the engine under the beauty cover. Trace the #6 wire back to see which coil pack it goes to. Then swap that pack with another pack, clear the codes, and fire up the car. See if the check engine light comes back and if so, scan the car to see what codes come up. If you still get P0306, then the failure didn't move, and the coil pack is not the issue (in your case, it's likely to be the wire, since you have new plugs and swapping coils didn't work). If the misfire moved to a different cylinder (one which is now hooked up to the coil pack that was originally firing the #6 cylinder) then that coil pack is bad and must be replaced (another known issue on the A4).

May 05, 2009 | Audi A4 Cars & Trucks

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