Question about 1999 Ford Expedition

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99 ford running rough

I have a 1999 ford expedition that is misfiring mechanic told me it has no compression in first cylinder. there is no water in the oil, starts fine but runs really rough. mechanic says blown head gasket or cracked block.What do you think?

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If it's dead in cylinder one then it could be a burt valve to find out for sure all you do is put it up on top dead center of the compression stroke and pull the spark plug out and apply air to that cylinder, You can remove the air cleaner and the radiator cap so that where ever the air comes out thats where your problem is, if it comes out the intake its the intake valve if it's comming out the exhaust pipe its you exhaust valve if it blows bubbles out of the radatior then it's the head gasket, if it comes out of the rocker arm cover then it's the rings.

Posted on Nov 13, 2009

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LINCOLN: 1999-2004 Navigator
2002-2003 Blackwood
2003-2005 Aviator MERCURY: 2003-2004 Marauder
ISSUE: Some 1999-2004 Navigator, 2002-2003 Blackwood, 2003-2005 Aviator, 2003-2004 Marauder and 2003-2004 Mustang vehicles built before 12/19/2004 equipped with 4.6L 4V/5.4 4V engine may exhibit a runs rough, lacks power, and engine misfire, prompted by a MIL light and DTC codes P0301, P0302, P0303, P0304, P0305, P0306, P0307, P0308, and P0316.
ACTION: Diagnose engine for engine misfire concern. If diagnostics determine an engine misfire which is characterized by leakage through exhaust valve(s), only replace the affected cylinder head(s).
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t

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