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I have a 4 stroke, 125cc pitbike, it keeps blowing blue smoke in high gears, low gears and on idle! I checked the valves and they didn't leak so what else could it be?

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6 Suggested Answers

6ya6ya
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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

Papa Chan
  • 56 Answers

SOURCE: 1997 buick lasabre custom

It sounds like you have a vacuum leak or intake gaskets leaking. Try this. Start the engine and let it reach the idle it want to go to. Get you a can of Brake Clean and spray it around the intake manifold (it on the top center of the engine, you may have to removed a plastic cover) If the engine idle changes up or down then the intake gaskets are leaking hence your vacuum leak. I hope this will help you.

Posted on Jan 04, 2009

  • 7 Answers

SOURCE: oil consumption, no smoke, no leaks

Yes a crappy PVC valve can cause some of your problems but not necessarily all of them, they are cheap, I always replace it to start. The air cleaner housing being full of oil is like how the oil is being consumed. In addition to a PVC valve, there may also be a blow-by hose running into the housing. check to see what other hoses go into the housing & which ones have oil coming from them. I'm not familiar with the "Motor Honey" you mentioned but I rarely add additives to my Engine oil, especially if they are thickeners. The only stuff I recommend is a Quaker state or similar "High Mileage Oil". These semi-synthetic oils have additives to swell old rubber & cork seals in older engines and can help reduce oil consumption & leakage. Again, it may not be a total solution, but it couldn't hurt to drain out all of the existing oil & replace with a high mileage type & also change the filter at the same time. Never mix it with other oils, despite the manufacturer telling you it may be safe to do so.

Posted on Mar 29, 2009

  • 4088 Answers

SOURCE: 2001 Saturn,blows Blue smoke only when ideling

It likely has worn out or hardened valve seals in the head(s). Oil is leaking into the cylinders through these seals. I'd try a seal softening agent in the oil before doing a valve job. Check your local auto supply for such stuff. A good mechanic can replace the seals without tearing off the heads.

Posted on Jul 16, 2009

  • 209 Answers

SOURCE: high idle and high rev though shifting

Spray wd40 around the head sounds like it did not seal right

Posted on Apr 23, 2010

bluebirdmate
  • 1190 Answers

SOURCE: 05 vue ac problem, ac not cold at idle, blows cold

Hello, Are the cooling fan(s) coming on with the truck in park and the engine at idle? If the cooling fan(s) are not working A/C will not cool with truck setting still.

Posted on Oct 02, 2010

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2 Answers

What could cause blue smoke from exhaust?


blue smoke is burning oil
I gather that you let the engine idle and when you give it rpms that there is a cloud of blue smoke
if that is the case it indicates that the valve stem seals are hard /failed and when the engine is at idle ( 15" mercury vacuum in manifold) the oil around the valves is sucked past the stem seals and into the combustion chamber
AS you have restricted use of the machine (every 3 weeks ) it is not a great problem as when you are on the road it is not happening (Only at idle )
It is repairable without removing the head if you find an accredited service shop that has experience in the procedure.

Jul 06, 2015 | 1989 Mercedes-Benz 300-Class

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Why is my 2000 kia sephia blowing blue smoke from the tailpipe. it has 86,000 miles. the check oil warning light is on even though the dipstick reads full.


The most common cause of blue exhaust smoke is oil leaking past engine seals and into the cylinders where it then mixes and burns with the fuel. This is most frequently seen in older or high mileage cars with worn seals and gaskets. It only requires a very small amount of oil leaking into the cylinders to cause excessive blue exhaust smoke.

Blue exhaust smoke only at start-up can indicate worn piston seals or damaged or worn valve guides which may also cause a rattling noise. An external engine oil leak can drip onto hot engine and exhaust parts causing what appears to be blue exhaust smoke. Other possible causes of blue exhaust smoke include: piston wear, worn valve seals, a dirty or non-functioning PCV valve, worn piston rings, an intake manifold gasket leak, worn engine oil seals and possibly even head gasket failure.

Oil leaking into the cylinders can cause a rough idle, misfire and fouled spark plugs. In addition, a reduction in power and oil loss can be indicators that the blue exhaust smoke is caused by an internal engine oil leak. Internal engine oil leaks can also allow fuel to mix with the oil in the crankcase which will degrade the oil and prevent it from adequately protecting the engine.

Operating a car with a severely dirty oil filter, air filter or improperly functioning PCV valve can also sometimes result in engine oil blow-by, oil loss and blue exhaust smoke. Periodically checking the engine oil level with the oil dip stick will indicate if there is excessive oil consumption. Higher viscosity engine oil can sometimes temporarily reduce the amount of blow-by; however, this is not generally recommended. Excessive blue exhaust smoke indicates a possible internal engine oil leak that should be inspected by an ASE certified mechanic.

Dec 08, 2014 | 2000 Kia Sephia

1 Answer

1985 Ford F150 302,5.0 Smoking running Rich and idling high and low


first of all u need to determine what color of smoke it is and is it coming out of the exhaust pipe. black smoke means excessive gas burning ...blue smoke means burning oil ...white smoke if seen in warm weather conditions means coolant leak into cylinder heads... but as running rich and high low idle might have a vacuum leak or carburetor need new base gasket or rebuilt ... good luck

Oct 13, 2013 | Cars & Trucks

1 Answer

High to low rpms


There may be a problem with the idle air control circuit. Make sure that the throttle body and idle air passages are clean. If not, you may have to do a throttle body cleaning on it. You can follow the directions on the can, but you will have to make sure that you give it a few shots with the throttle plate closed, so that the cleaner can get into the idle air passages. Also, make sure that there are no vacuum leaks and there is not any un-metered air that is entering into the intake. If the exhaust is blowing out and blue smoke, then the piston rings may be worn or stuck and the combustion chamber all carbon built up. If it blows out black smoke, then it's running too rich.

Jul 05, 2013 | Cars & Trucks

1 Answer

Engines idle goes up and down after warming up and blows blue smoke


If the engine idles for a while then blows blue smoke this is an indication of oil passing the valve stem seals and being burnt in the combustion process. ( When you are at lights and they change and you accelerate away leacing a cloud of blue smoke this is worn valve guides and failed valve stem seals) As for the idle it could be the oxygen sensor is coated with oil and soot and is malfunctioning henace the cpu cannot regulate the fuel setting correctly. Have the valve seals replaced and clean the Oxygen sensor and check for other fault codes

Feb 17, 2013 | Cars & Trucks

1 Answer

Rough idle and blue smoke. change exhaust manifold because it was cracks know its missing and sputtering when i put in gear. changed egr valve before manifold.


blue smoke indicates either a bad transmission modulator valve,or a manifold leak{intake} i usually do this test for a bad or suspected bad intake manifold leak,light a cigarette and take it around the intake manifold and look for it to glow really bright for an intake leak,for an exhaust leak you can see it blow the embers away from it.just make sure there's no gas around to ignite.always make sure that a fire ext.is onsite! thank you for choosing fixya.com!

Jun 09, 2011 | 1997 Nissan Pickup

2 Answers

2004 chevy tahoe sometimes smokes when started


The smoke you are seeing is most likely oil seeping through the valve stem seals into the combustion chamber .......

Jun 08, 2011 | 2004 Chevrolet Tahoe

1 Answer

I have a problem with my econovan, i havent had a service done to it in over 6 months and now when i took it to a guy to service it, its been blowing blue / white smoke only on cold motor so i did some...


Hello, I have several suggestions for you. Your problems can still be with the cause of the blue smoke. You need to get a compression test done on the motor either with an elaborate test machine at a Dealer or Tune-up shop or use an old-fashion compression gauge. With the valve cover off and engine running you can also push on the valve spring with your thumb and weak valve springs will cause the engine to miss. Sometimes the weak springs can be detected with a Vacuum gauge, showing a bouncing needle. Your valve stems may be gummed up from the bad oil seals you changed.

The blue smoke is also a sign that the oil rings for the pistons are worn out or have rotated to give a bad seal. When the engine warms, the rings expand and helps eliminate the smoke. Check your sparkplugs for oil staining. Your sparkplugs may be fouled and this condition is called "blow-by".

You can check and clean your EGR valve because it needs to seat or your engine can not idle smoothly. Check the Intake manifold for loose bolts, then use a water mist around the seams to see if the Intake gasket is leaking. Just use an old spray bottle filled with water and spray the engine while it is running.

I hope my solutions are very helpful to you in finding the problem.

May 09, 2011 | Ford Econoline Cars & Trucks

2 Answers

Combo diesel engine blows blue smoke from only one cylinder,disconnected electric on each cylinder but smoked only on the same cylinder. Could it be the head gasket,leak from oil passage way. Should i try...


Blue smoke means that the cylinder is burning oil with gas/diesel. White smoke means that the engine is cold and excess fuel is being burnt. It means that the cylinder is having worn out rings.They need a change. Also check the engine oil level as well. It may be going low gradually.

Jan 01, 2010 | Volkswagen Eurovan Cars & Trucks

1 Answer

2001 Saturn,blows Blue smoke only when ideling


It likely has worn out or hardened valve seals in the head(s). Oil is leaking into the cylinders through these seals. I'd try a seal softening agent in the oil before doing a valve job. Check your local auto supply for such stuff. A good mechanic can replace the seals without tearing off the heads.

Jul 16, 2009 | Saturn SL2 Cars & Trucks

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