Question about 1999 Lincoln Town Car
You need to have your engine tuned up, unless it's been done recently. misfire means it's not getting fire or fuel to #7 plug. you may have a plug wire bad or a bad spark plug on #7 if you go to effort of sending it to garage just to replace one plug or wire,you'll pay labor for whole tune up. wires,plugs, and maybe a bad coil pack. suggest you have tuned up with new plugs and wires. also while they are there, have them check fire to #7 plug on coil first before you do a complete tune up. thank you for choosing fixya.com
Posted on Dec 30, 2010
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Posted on Jan 02, 2017
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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.
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).
SERVICE PROCEDURE FOR VEHICLES WITH RUNS ROUGH/MISFIRE CONDITION:
1. Perform relative compression check on all cylinders. If abnormal, check cylinder leakage and actual compression for "low" cylinders refer to Workshop Manual (WSM), Section 303-00.
2. If leakage/compression check indicates a valve train concern, per valve train diagnostics in WSM, Section 303-00, replace cylinder head and cam assembly, pipe plugs and timing chain tensioner, per procedure outlined in WSM, Section 303-01.
3. If cylinder leakage and compression tests are inconclusive, perform misfire diagnostic, per TSB 05-22-8.
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