Question about 2001 Jaguar S-Type
That's specific enough to be spark plugs and/or wires. Depending on the year (engine placement) it might be easy to check yourself but it'd also be relatively quick for a mechanic to do the same. If it were anything more serious like a crankshaft sensor, or the crankshaft itself, the car wouldn't maintain idle long enough to drive. Best to take care of this ASAP though.
Posted on Oct 29, 2012
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Posted on Jan 02, 2017
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Oct 29, 2012 | Kia Sedona Cars & Trucks
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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