NHTSA Complaint #10296030 — 2008 JEEP GRAND CHEROKEE

ENGINE AND ENGINE COOLING:ENGINE issue reported to NHTSA

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Complaint Details

ODI Number	10296030
Vehicle	2008 JEEP GRAND CHEROKEE
Component	ENGINE AND ENGINE COOLING:ENGINE
Date of Incident	November 6, 2008
Date Filed	December 16, 2009
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	PA

Consumer Description

2008 JEEP GRAND CHEROKEE LIMITED 5.7L HEMI 4X4. EXPERIENCING LOUD ENGINE NOISE WHEN FIRST STARTED. MOST NOTICEABLE WHEN ENGINE IS COLD. MORE PRONOUNCED ON COLDER DAYS THAN WARMER DAYS. APPEARS TO EVENTUALLY SUBSIDE AFTER ENGINE REACHED MAXIMUM OPERATING TEMPERATURE. NOISE IS NOT ENGINE PISTON SLAP, DOES NOPT INCREASE WHEN ENGINE REVOLUTIONS ARE INCREASED, RATHER, IT APPEARS TO SUBSIDE, INDICATING VALVE TRAIN NOISE DUE TO HYDRAULIC LIFTER NOT FULLY PUMPING UP, RESULTING IN VALVE TRAIN CHATTER REMINISCENT OF MECHANICAL LIFTERS NEEDING ADJUSTMENT, DUE TO COLD OIL (HIGHER VISCOSITY) OR LOW OIL PUMP PRESSURE. CHANGING TO MANUFACTURER RECOMMENDED MOBILE1 SEEMS TO INCREASE NOISE. *TR

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