Question about Chevrolet Silverado 1500

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#6 cylinder keeps fouling out w/gunked or caked oil

Enging missing - #6 cylinder is gunked up w/ oil

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  • PAUL M VANHORN
    PAUL M VANHORN Jan 02, 2014

    it uses oil, but not smoking, #6 CYLINDER IS ALWAYS GUNKED UP-WON'T FIRE-ENGINE KNOCKS

  • PAUL M VANHORN
    PAUL M VANHORN Jan 02, 2014

    CHANGED THE PLUGS - IT CAKED UP AGAIN - ENGINE LIGHT KEEPS FLASHING

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The engine light is flashing because it is detecting a misfire. Is it a model with individual coil packs, switch the coil with one of the others, see if the fault follows the coil, if it has a distributor and plug leads, do the same with the leads. try to eliminate components. If the fault stays on number 6, then the problem is on the cylinder, need to do a compression test, possible piston rings worn.

Posted on Jan 02, 2014

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SOURCE: 98 f150 cylinder 4 misfire(4.6)-

it mit be out of time try advance your disbutor

Posted on Jan 17, 2009

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SOURCE: 302 v8 not firing on 2 cylinders

do a compression test.sound like your engine piston rings and valve guides are worn out.

Posted on Jul 20, 2009

hfmiles
  • 1165 Answers

SOURCE: 1998 Chevy Silverado K1500, 5.7 , number 5

If the insulator was cracked the plug would have been misfiring, unless it was broken while trying to remove it. If this oil fouling is an ongoing problem, and you have to keep changing the plug, buy a spark plug that is designed to fire when oil fouling is a problem. You may have to order one from a part catalog, such as JC Whitney. This would keep you going until you can get the problem repaired..

Posted on Dec 29, 2010

Testimonial: "Thanks, I am hoping I found the problem last night, the intake gaskets on the lower intake were bad around #5 and #8 by the coolant jacket. "

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Rear spark plug bank is fouled. The 3 in front are fine. What cold be the problem?


I am assuming it is oil fouled rather than fuel fouled. Oil fouling is usually due to valve stem seal leakage. Most engines have the oil return on the cylinder head at the rear. When the engine is shut off, some oil pools at the rear of the head. If the valve guide seals are worn, then the oil will leak around the stem of the #4 valve and eventually foul the plug. If there are no real issues with the engine other than this one, it is usually best to keep a clean plug or two available and swap out the plug periodically when fouling is detected. Then clean the fouled one and keep for reuse later. If it is happening too often, getting the cylinder head reconditioned is a good idea.

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One plug foul after 200 miles runs ruff


the next time it fouls check the plug when you take it out, if it is covered with oil then you may have a broken ring on the cylinder that is allowing oil to pass through to the combustion chamber and fouling the plug. Or the valves pay be letting oil drain in past the valve seats.

Jul 04, 2012 | Chevrolet Caprice Classic Cars & Trucks

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1999 v6 firebird misfires on #6 cyl when under load, plug was fuel fouled last time I had it replaced, but keeps missing only when under load. no other problems.


if you've changed the spark plug and no difference, then it's time to swap the coil with another cyl. coil and see if the miss goes to the other cylinder, if it does'nt follow to other cylinder, then I would replace that injector !

Mar 18, 2012 | 1999 Pontiac Firebird

1 Answer

2005 dodge caravan sxt engine missing


I have run into these caravans burning oil, not much you can do except keep an eye on the oil level or spend a lot of money having piston rings replaced.
The best way to go about finding the misfire would be to go to an auto zone or other auto parts store that will scan the computer for codes. the codes will tell you which cylinder is misfiring.
I would bet it could be a fouled spark plug due to oil burning but could be a plug wire also.Have the codes read and find the cylinder that is misfiring and remove the spark plug and see if the tip is covered or worn down, if it is then replace spark plug and you may want to do them all. up to you.
If the plug is okay then move on to spark plug wires, swap the misfiring cylinder wire with another cylinder and see if misfire moves if it does then replace the wires.

To find the cylinder by #. If you are standing if front of the van looking at engine cylinders 2,4,and 6 are in front, closest to radiator from left to right. then cylinders 1,3,and 5 are at the rear also going left to right.
Good day.

Mar 03, 2012 | 2000 Dodge Caravan

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My 2004 ford freestar with the 3.9L has been fouling out plugs with some consistency. they look to be oil fouled did compression test and they 1)195 2)200 3)200 4)205 5)200 6)205. any ideas od why they...


You need to have the rings replaced. Do the compression check again on a cold motor with this exception, add a small amount of oil to each cylinder. First do the test on the cylinder and record the pressure then add a small amount of oil and redo the test and compare the compression. I am attempting to identify if the problem is rings, valves or head gasket. I am concerned about cylinder 1. The compression is within range however the readings you provided indicate uneven compression. If after you add the oil the pressure evens out across the cylinders the problem is rings. If you get the same readings during both test the problem is the Head Gasket or a need to have a valve job done. The fouling is caused by oil getting past the rings or seals. Use regular oil in this test preferably in a hand oiler. Two to three squirts should be enough. DO NOT USE WD40 OR OTHER SPRAY LUBRICANTS. Those will damage your cylinder walls.

Aug 09, 2011 | 2004 Ford Freestar

1 Answer

2005 3.5l some times smokes oil then stops


Smoke oil? For what your thinking that is oil? Smoke coming from the tailpipe is not good news, but does not necessarily mean the engine needs rebuilding. First, you need to determine what color of smoke is coming from the tailpipe
* White smoke is caused by water and or antifreeze entering the cylinder, and the engine trying to burn it with the fuel. The white smoke is steam. There are special gaskets (head gaskets are the primary gaskets) that keep the antifreeze from entering the cylinder area.
* Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with the white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe.
* Black smoke is caused by excess fuel that has entered the cylinder area and cannot be burned completely. Another term for excess fuel is "running rich." Poor fuel mileage is also a common complaint when black smoke comes out of the tailpipe. Black smoke out the tailpipe is the least cause for alarm.


If you confirm us that is oil smoke, check and keep in mind that the car has many seals, gaskets, and O-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plug, it will cause a misfire (engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

Keep us updated.

Apr 15, 2011 | 2005 Mitsubishi Diamante

1 Answer

CHUCKS OUT CLOUDS OF BLUE SMOKE.


Blue Smoke: Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with the white smoke, just a small drop of oil leaking into the cylinder can produce blue smoke out the tailpipe. Blue smoke is more likely in older or higher mileage vehicles than newer cars with fewer miles.

How did the engine oil get inside the cylinder in the first place? The car has many seals, gaskets, and O-rings that are designed to keep the engine oil from entering the cylinder, and one of them has failed. If too much oil leaks into the cylinder and fouls the spark plug, it will cause a misfire (engine miss) in that cylinder, and the spark plug will have to be replaced or cleaned of the oil. Using thicker weight engine oil or an oil additive designed to reduce oil leaks might help reduce the amount of oil leaking into the cylinder.

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Check your distributor cap & wires first. If all is ok pull the spark plug and check if it's oil fouled. If there is no oil on the plug the plug might be bad. if there is oil on the plug you can get an adaptor that screws over the end of the plug and shields it from getting oil fouled. Of course this is a temporary solution for a piston ring or valve seal problem. I had a caddy I ran with plug shields fo 5 years so they work! Good luck!....PS If your plug is oil fouled you can also use a heavier oil like a 20/50 or use 4 quarts of 10/40 and a quart of lucas oil stabilizer. This will help keep the oil where it belongs and don't forget to do an oil change every 2,500 to 3000 miles.

Sep 23, 2009 | 1997 Chevrolet Blazer

1 Answer

Spark Plug Fouling


fix the root cause . probly needs valve guid seals.

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