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I just replaced my fuel injectors and im having difficault starting, rough operation and excessive exhaust emissions (blue) now im not sure if it is from the fuel leaks that there is still air in the system or what to look at

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Air in a fuel injection system is removed very easily. Simpley runing the engine will remove any air in a matter of seconds. I would check to be sure that the injector wires are hooked up in correct postion. Also be sure the MAF sensor is plugged in. Are you getting any CEL codes? Also using an auto ranging ohm meter check the resitance of the old ones VS the new. What made you change them? Also did you change the spark plugs while you had the rails off? Let me know if I could be of any more assistance. Thank you for using fixya.com

Posted on Oct 07, 2008

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hi nishga
im dave; hope i can help

First you need to determine if it is actually black smoke or if it is blue smoke. There are three colors of smoke that can come from the tailpipe. It is not white smoke obviously because that is easily differentiated from blue or black and generally indicates water or antifreeze leaking past the head gasket and into the compression area of the motor. White smoke is the steam of the water/antifreeze being emitted

Blue smoke is caused by engine oil entering the cylinder area and being burned along with the fuel air mixture. As with 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. 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 plugs, 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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