Blue Smoke from Exhaust Pipe explained

Many people consider blue smoke from a car to be elusive. Blue smoke is generally  caused because of several specific conditions in the vehicle's engine. We will help you  determine what the problem is so it can be corrected and stop the blue smoke. Blue  smoke appears mostly at morning start up because oil from the vehicle's Engine is  mixing with the gas inside the engine's combustion chambers, then burned together  with the fuel from the injectors  while the engine is running. This can result in a very expensive repair, but not  always. The more expensive and usually terminal reason for blue smoke is the piston  rings have worn out allowing engine oil to pass into the combustion chamber.

In this case the engine is worn out and needs to be replaced, this can be expensive.  There are other reasons the engine can burn oil, some engines have a small oil drain  back holes in the cylinder heads, these holes allow the engine oil to drain back  into the oil pan. The oil is picked up by the oil pump and returned back to the  engines vital parts under pressure. If these drain back holes become plugged it  can cause oil to seep down into the valves and into the combustion chamber. To repair  this problem remove the valve cover and clean debris from the drain back holes,  reassemble and recheck (note: after repair you must wait 2 to 4 days before the  remainder of oil on the valve stems to be removed).

Most of the time producing blue smoke can be repeated since it's not usually  a problem that is a single occurrence. Typically, once a vehicle starts producing  blue smoke this pattern will continue to repeat until the engine is repaired. There  are times when some engine additives can cause the blue smoke as well.  If  you are continuously adding additives to your fuel to stop smoke, you may be inadvertently  covering up the smoke that your car produces normally. However, if you are continuously  adding engine or fuel line cleaners that are a strange color it can on occasion  produce the strange colors of smoke. This condition is normal and will subside when  the cleaner has run its course.

Common Problems and Solutions

The most common problems of blue smoke revolve around oil leaking into the engine's  combustion chambers and burning with the fuel as discussed. However, the solutions  to the problem often vary depending on the exact condition of the engine. There are times when the correction can be as simple as changing the valve stem  seals or cleaning drain back holes.

It is important to note that if you decide to repair the engine you have, you  are often looking at hourly repair rates plus parts and machine work to repair the  engine. This is quite costly and depending on the age of the engine may well not  be worth the expense of the repair.  If you are highly fond of the vehicle  and intend to keep it there are definitely times when a new or rebuilt engine is  a better deal.  Keep in mind, if you decide to change out the engine you are  often able to extend the life of your vehicle by 10 years or more which can save  thousands over the price of buying a new car. Plus, your best bet on a new or  rebuilt engine can be obtained by the dealer; surprisingly the dealer cost for the  engine (engine only, not labor to install) is close to what you will pay to have  the engine rebuilt independently.

Maintenance

Maintenance for a vehicle is something that  is often overlooked. From blank stares when asked when the last oil change occurred,  to the even stranger looks that occur when asking when the last tire rotation was  completed. It is very important to maintain oil changes and tune-ups that are performed  on schedule.  Proper maintenance to your car is a good way to keep all internal  engine parts from becoming damaged prematurely. Without oil lubrication an engine  will quickly become severely damaged. Anytime you are able to lengthen the life  of the engine and help avoid breakdowns it is beneficial to the motoring experience.

Sometimes it is advisable to seek a professional ASE or other certified mechanic  to troubleshoot the problem for  the blue smoke condition. Never avoid engine problems as they can cause a simple  and inexpensive repair to escalate to a costly repair that could have been avoided.  Choosing the right mechanic or repair shop for your needs is often the biggest issue,  however many times it can take just a referral from a friend or relative in order  to find an appropriate repair shop.

Poorly maintained engines are much more prone to problems such as smoking. The  excessive friction leads to catastrophic engine failure. Preventative maintenance  is cheap insurance to ensure that your vehicle runs as smooth as possible for many  miles to come.