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2006 GMC Savana 3500

Reliability tier: verified - see /disclosure/

Engine: 6.0L V8 Gasoline (Vortec 6000, LQ4) (GM Vortec Gen III, 6.0L), 2v

Vortec 6000 (LQ4): the heavy-duty 6.0L of the GMT610 facelift era, 2500 and 3500 vans (heavy-duty series), 4L80-E behind it. Ratings by year group per this platform's key_config_variable (the same engine as the HD trucks).

Applicable failure modes (3)

• Exhaust manifold bolt breakage (cold-start tick)
• Hard cold start / fuel delivery wear
• Ignition service at mileage: coils, wires, plugs (misfire under load)

Applicable parts (10)

• gm-hd-gas-vortec: exhaust-manifold-bolt (honest catalog gap)
• gm-hd-gas-vortec: exhaust-manifold (honest catalog gap)
• 6.0L Vortec Fuel Injector (OEM)
• 6.0L Vortec Fuel Rail, Passenger Side (OEM)
• 6.0L Vortec Fuel Rail Assembly 2004-2007 (OEM)
• 6.0L Vortec Cylinder Head Gasket Kit (OEM)
• 6.0L Vortec Ignition Coil Kit (OEM)
• 6.0L Vortec Spark Plug (OEM)
• 6.0L Vortec Thermostat (OEM)
• 6.0L Vortec Water Pump Kit (OEM)

Platform recipes (3)

• Cold-start tick on a 6.0L or 8.1L GMT800 HD gas truck: find the leaking manifold flange before blaming lifters or injectors, then extract the sheared studs and refit bolts and gaskets (mode fm-gvg-exhaust-manifold-bolts)
• Hard-cold-start path (fm-gvg-fuel-delivery-cold-start): the owner record puts most cases on tired in-tank pumps and rail pressure bleed-down, not ignition
• Ignition service path (fm-gvg-ignition-misfire): misfire under load / rough idle at mileage on the 2001-2007 HD gas engines