Have code po303 changed spark plugs only spark plug three has oil on it what does this mean?

I assume it is a Ford based on the code you provided.



It means that there is oil getting into the plug galley for that plug, most likely due to a leaking valve cover gasket. There are o-rings that surround the plug galleys on the usual Inline 4 cylinder Ford motor that often go bad and let oil drip into the galleys where the plugs are located, eventually leaking into the threads of the plug and into the cylinder just like penetrating oil would.. The oil will contaminate the plugs and wires and cause misfires. Check the valve cover gasket for signs of leaks. Stick your finger into the plug galley, if it comes out with oil on it, replace the gasket.



Code po303 is Random engine misfire, probably being caused by the reason I listed above. Also, if you did not change the wires, make sure you do, especially if you had oil on the plug(s).



I doubt it is something internal, chances are it is something as simple as the Valve cover gasket leaking, so dont panic yet.



Note: If your piston rings were bad you would be blowing a ton of blue smoke out of the tail pipe and have a serious compression issue.



Update: Based on the additional info you provided, replace the valve cover gasket anyways, and replace the ignition wires, clean the new plugs with come carb cleaner before putting them back in to make sure there is no oil on them. Clear the trouble code, drive for a few days. If the same trouble code comes back, do a compression test on the cylinder that has an oil contamination problem. Also, run some injector cleaner through the fuel rail (or have a garage do it). Dont use the stuff you put in the tank, it will just stir up the dirt in the tank and complicate things. Use the propellant based cleaner that gets injected directly into the fuel rail. A dirty injector can cause a po303 code as well.



Never jump to the more severe solution when simpler solutions are often the answer.
Have code po303 changed spark plugs only spark plug three has oil on it what does this mean?
Oil or fuel? Could be bad plug, wire, cap, rotor, or coil pack, depending on car. Have to know make/model/year/and engine to help further.
Have code po303 changed spark plugs only spark plug three has oil on it what does this mean?
Piston rings are probably bad. But if you're lucky, it may just be a bad PCV valve.

Special tool for changing spark plugs on a sea ray boat?

we have a sea ray boat and the spark plugs are bad and we need to change them and they are really hard to get off and are located in the worst place (right under the engine) and is there a special tool we can buy to get under there a lot easier

please help :)
Special tool for changing spark plugs on a sea ray boat?
yeah, extensions and universals for your ratchet and socket set, nothing on a boats ever easy to get to, just take your time, think through it and with simple hand tools and patience you will be ok

What spark plug adds the most horsepower?

i have a 99 v6 mustang and im going to change the spark plugs and i wanna know which one adds the most horsepower?
What spark plug adds the most horsepower?
Horsepower is totally dependent on the bore and stroke of the engine and the condition of the fuel delivery system and condition of the ignition coil and wires. ALL new spark plugs will give exactly the same amount of horsepower. A good spark is a good spark--period. Once it lights the fire, the spark plug is out of the picture.



If you believe otherwise, you've fallen for marketing hype.



On the flip side, how LONG the spark plug can deliver a good spark IS open for discussion. That's where platinum and iridium come into the picture. They have a much higher melting point than ordinary copper electrodes. Since the hottest spark is one that just from a SHARP edge, you want a spark plug electrode that won't wear quickly.



The best metal out there for long life is iridium. Doesn't matter which brand.



Once again, don't fool yourself into thinking that one spark plug provides more HP than another, That's just advertsiing.
What spark plug adds the most horsepower?
spark plugs wont really add horsepower, their more efficient or accurate. that's all. they'll make an engine run better to its potential, like if your going from plugs that are very old and the gaps are wrong or are corroded, you'll notice a big difference. otherwise you wont notice more power, just cleaner or more efficient
Well the best are %26quot;Denso%26quot; kind of pricey but will add horsepower and performance.
what ever the OE spark plug is that is what you should put back in. Computerized cars have specific heat ranges that they are programed with so unless you have mods done to the engine I would stick to what the owners manual says to put in it. I own a 93 gt with the 302 in it and it burnt the living sh*t out of any of the hotter plugs. I paid $10 per plug for the denso iridium's and i was replacing them 6 months later. also, mustang don't like bosch, champion, or acdelco. I Auto light platinum's in mine and they do just fine. if you are looking for power, install a V8. that will help a lot ; )

Changed spark plug in 94 mercury capri, turns over wont start, getting, fire, fuel,?

spark knocking, husband at beach, changed plugs, getting fire,

low fuel pressure changed pump,filter, strainer checked pump relay, fuses,belt good,any suggestions? turns over good,and try to start .but when you push down on accelerator it doesn't seem to do as well
Changed spark plug in 94 mercury capri, turns over wont start, getting, fire, fuel,?
Engines need 4 things to run, fire, fuel, air, and compression. If you are getting fire, fuel, and air and it is still not starting that leaves a compression problem. If you go to your local auto parts store you should be able to loan out a compression tester for a few bucks, real easy to use. Look in a Chilton or Haynes and it should tell you what the compression is. Test each cylinder if it is below you probably have a head gasket problem, it could even be rings or maybe worse. The timing is also very important that could keep it from running so make sure the timing is correct and the firing order is correct. There are also sometimes ignition or ecu fuses that are seperate from your fuel fuse or relay that could keep it from start but will still allow it to turn over. It would help if I was able to get a good description of what it sounds like when you turn it over, a lot can be told by the sound. If none of these work for you feel free to pm me and I can give you a few more things to check out.
Changed spark plug in 94 mercury capri, turns over wont start, getting, fire, fuel,?
Broken timing belt?
is it in the right firing order?

Changing spark plugs 96 Jetta?

Ok, so i'm kinda new to the DIY auto scene, and my 96 Jetta gls needs new spark plugs. A few questions... My car (bought used) didn't come with a manual, so I don't know which size to buy. Second, which brand (if it matters) would give the best performance/reliability. Finally, do I need to disconnect the battery before attempting the job?
Changing spark plugs 96 Jetta?
The manual states to disconnect the battery before you do any type of maintenance to the car. You will need a special tool to remove the wires from the plugs the car had a plastic one originally snapped to the hood prop rod.



http://www.kingsbornewires.com/product.s鈥?/a>

Bosch standard (single electrode) PN: W0133-1637524
Changing spark plugs 96 Jetta?
Go here for ALL your spark plug options.



http://www.sparkplugs.com/results_app.as鈥?/a>



Brand does not matter. The main thing nowadays is the material, since many manufacturers recommend 60 to 100 thousand mile change intervals. Big change from the every 12 thousand back in the day (70's).



Get the best you can afford. Seems iridium is what the manufacturers are OEM'ing in new cars, so you really can't go wrong on these as a choice.



And no, the battery does not need to be disconnected when you change the spark plugs.
if you go to the parts store they will know what size you will need...there are only two sizes anyway. DO NOT!!! get any kind of spark plug with the word platinum in the name. they are usually more expensive and while sometimes making other cars run better they make these run worse. i've owned six 93-99 generation Jettas/golfs so i would know!
when you go to buy your spark plugs at a auto parts store ask the store clerk for help he will answer all your question for you on what you will need hope this answer your question

msdn

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What does changing a spark plugs gap do? does it make the spark hotter?

if a car calls for .060 is a smaller gap gonna make it do something different than like a .090 gap?
What does changing a spark plugs gap do? does it make the spark hotter?
A lot goes into the decision of what gap is correct. First the compression ratio, grade of fuel being used, tye of axle ratio and type of transmission. Then there is the firing KV killa-volt. according to the type of ignition that you have. standard ignition with points and a condenser is 15,000 to 18,000 volts. HEI= high energy ignition will go to 60,000 volts and COP= coil over plug can go to 90,000. The last is CDI= capacitive discharge ignition and it is capable of 125,000 volts. So if you have a ignition system that is very strong, it can bridge the larger gap and provide a strong ignition. The spark plug is the other side of the equation, wrong plug and you have a poor running car. Stick with what the dealer recommends and you will eliminate any problems in that area. Hope this helps.
What does changing a spark plugs gap do? does it make the spark hotter?
well the larger the gaps is called for the hotter is may be but each car has their own ignition that is only capable of producing a spark hot enough for what it was designed to do. the spark doesnt get hotter when you change the gap but it changes the profile meaning that it changes its amperage and duration. be careful not to make it so small that it cant ignite and to large that it will be put out before the fuel is ignited.

Does 2004 Honda Civic Ex Has A Spark Plug Wire?

I need to tune up my car soon then i notice that the car has no spark plug wiring. Do i just need to change the spark plug only since it doesn't come with the wiring? What should i do if i would change my spark plug but don't dont have the wiring. Is it ok?
Does 2004 Honda Civic Ex Has A Spark Plug Wire?
It has coil boots..There on the bottom of the coil that you pulled out and most of them are changeable