Question about 1999 Cadillac Escalade
BAD FUEL PUMP WILL MAKE A HIGH PITCH WHINNING NOISE.BLUE SMOKE SIGN OF WORN RINGS OR WORN VALVE GUIDES AND VALVE SEALS.DO A FUEL PRESSURE TEST AFTER FUEL FILTER CHANGE FUEL PRESSURE SHOULD BE 60 - 66 PSI.
Posted on Mar 13, 2011
As for the noise if it is a high pitched whine that you can hear while the engine is running its probably normal...most of them sound like this. it should be the same sound that comes on briefly as you turn the ignition on before the engine starts. if it is extremely loud, it may be a build up of debris in the filter causing too much back pressure on the pump or the pump may be on its way out. as for the blue smoke.... blue smoke is oil burning in the engine. you didnt say how many miles are on the vehicle but as a vehicle ages it will usually consume some oil as the engine is running. if the smoke only comes out on start up its probably due to the valve seals weeping a tiny bit of oil thru them and its burned up once the engine is running. its not too much to be overly concerned with at the moment, just check your oil level in the engine a little more frequently as now you know that you are consuming some oil at times. also switching to a "high milage" oil may help as they have conditioners in the oil that slightly swell rubber seals in the engine.
Posted on Mar 13, 2011
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Posted on Jan 02, 2017
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