My oil tank cap has thick yellowish sludge and after having the oil changed its on 2001 Ford Expedition

still building up and now she's having trouble starting (2-3days later). Now I've notice white smoke and she's driving a little rough. The check engine light is on and I was told she's misfiring. What work should be done?? First I was told a major tuneup and now a valve job.... Not to mention almost 2yrs ago the engine was replaced and oil changes had been maintained.

by in San Diego, CA on February 24, 2012
2 answers 2 comments
ANSWER by on February 24, 2012
it sounds like it has overheated and you are mixing coolant and oil. have a leak down test to check the cooling system first before doing anything. Roy
COMMENT by on February 25, 2012
Okay thank you I will ask for the test. Will a leak down test detect a cracked or leaking head gasket and comfirm the need of a valve job? And can you tell me if valves 3&4 are "misfiring" would that mean a valve job should be done? Costing more than $2,500.00 or is that fair? Thanks again I wish I had your knowledge or Oprah's bank balance. AB
COMMENT by on February 25, 2012
yes, this test will confirm a head issue and yes, it could also be the missfire code. 2500 sounds like a good starting price. Roy
ANSWER by on February 25, 2012
check the warranty on the engine replacement ,seems like the engine was overheated and caused damage to the head or head gasket ,inspection needed

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