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Misfire due to oil leaking into spark plug. burnt oil smell

I have a misfire from a spark plug due to oil leaking into it. this also has a burnt oil smell after driving for a while. is there a crack somewhere? I already replaced the spark plug several times.

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Have a compression test done on the cylinders...sounds like the rings are bad allowing oil to blow into the cylinder...you may be able to fix it by adding a can of seafoam to your oil and see if that fixes it within a couple of weeks. You can buy that at any auto parts store or walmart or kmart.

Posted on Mar 17, 2014

Testimonial: "Thanks! getting my oil changed tomorrow. will have them add the seafoam."

  • denise robinson Jun 16, 2014

    the mechanic that changed the plug never sealed it. could this also be part of the problem? my check engine light is blinking

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6 Suggested Answers

6ya6ya
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Posted on Jan 02, 2017

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SOURCE: Spark plug seal replacement

toyota genuine part number is 11193-70010 6pcs for your car you have to buy and open the cylinder head cover and replace all the gaskets on right and left side

Posted on Jul 17, 2008

joboo1
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SOURCE: 98 vw beetle misfiring after rain. New plugs, coil cas cracks????

Hi, Yes it certainly could be especially if water gets in. You should also check the distributor cap. The misfire sounds like an arcing problem so it would have to be one of those two things since you changed the rest. Good Luck!

Posted on Feb 25, 2009

  • 1 Answer

SOURCE: service engine soon light keeps coming on. Now low coolant light

I would start by doing an oil change myself so you can examine the oil and look for water/antifreeze in it. You will be able to see it separate from the oil and you can smell the antifreeze. If there is then you have a leak between the water jacket and the heads somewhere. More than likely the LOWER intake gasket is leaking into the head. You said they replaced a gasket but was it the UPPER or LOWER? If it was the LOWER did they use RTV in the correct areas? Did they torque the intake bolts to the correct pressure and install the bolts correctly? I know you don't have these answers but these could all be part of the problem. It may be leaking more at #2 cylinder and causing it to foul more than the others. Also just because a mech pressurized the coolant system and didnt see any change in pressure (hopefully he wasn't just looking for visible leaks) the issue may not happen until the engine is hot, as metals behave differently when heated, especially aluminum which the LOWER intake is made. Have a mechanic or mechanically inclined friend (gearhead) remove the #2 plug wire, then kick the engine a few times without starting it, enough to let any fluid get into the chamber, this would include gas btw. Then remove the plug and look for any wet residue on the plug, gas will evap. quickly, antifreeze/oil won't. again try to smell the residue and if necessary, lightly touch some to your tongue, antifreeze has a sugary sweet taste that is easily detectable. Remember any time you are working with chemicals such as waste oil and especially anti freeze, minimize spills and clean them up quickly and completely and place the spent fluid in a sealable container and take them to a collection center for disposal. Waste oil is a carcinagin (cancer causing) agent and antifreeze (glycol) new or old will kill any animal (child, dog, cat,etc) that ingests it. Many auto parts stores and some other retailers that sell oil and antifreeze will take your wastes if you bought the replacement fluid from them, check before you buy.

Posted on Apr 04, 2009

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SOURCE: 2001 Galant ES-V6 DTC is P0304 - Cylinder #4 misfire

look for weak valve springs.

Posted on Jun 22, 2009

wracefans24
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SOURCE: Check engine light flashing

the fuel injector is not pulsing correctly,it probably has something in the screen in side of it,you will need to check that screen in the injector or replace it

Posted on Nov 25, 2009

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I change plugs and wires still have A miss


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Check carefully for fuel leak. If it starts well and then gets worse as it warms up, check coolant temp sensor. May be it just smells like fuel because it misses so badly fuel is not being burnt and floods tailpipe. Check spark at plugs with timing light to avoid sparks where fuel may be present. Weak or irratic spark can be coil/module, crank/cam sensor. Remove plugs to see what they look like or which is not firing.

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2003 Hyundai Sonata with 4 cyl. PO301 error code. Have replaced spark plugs, wires, coil packs, and mass air flow sensor. Replaced air filter due to heavy gas smell. Car was starting after tapping gas 3...


P0301 - Cylinder 1 Misfire Detected.

Possible Causes:
- Improper spark plug at cylinder #1
- Insufficient compression at cylinder #1
- Incorrect fuel pressure
- The injector circuit is open or shorted at cylinder #1
- Fuel injector #1 may be faulty
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Possible Solutions:
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- Replaced Spark Plug #1
- Replaced Injector #1
- Replaced Ignition Coil #1

Being you have a heavy gas smell I would look into the injectors. If injector #1 is over producing it can cause a misfire. Test your compression and fuel pressure.

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Sounds like valve cover gaskets need to be changed - they're a common failure on the 30v engine. Fortunately, they're also relatively inexpensive ($25 per cylinder bank - you need two - from www.ecstuning.com). They're also easy to change. They'd easily explain your oil smell - oil leaks onto hot valve covers and burns. Also, the misfire could be (not a guarantee, but it's possible) a result of valve cover gaskets as well - there's the main gasket which seals around the edge of the valve cover, and a second gasket shaped like three rings. This trims and seals the openings around each of the spark plugs, where the plugs are inserted through the valve covers. If you're leaking there, you can drown the top end of the plug in oil. If that gets into the spark wire boot, it can cause a misfire.

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