2008 CHEVROLET CHEVY

Typical onset: 80,000-140,000 mi

Symptoms: Loud ticking or tapping from engine, especially cold start, Loss of power and rough idle, Check engine light with misfire codes, Metal shavings in oil during changes

Fix: The L91 engine eats lifters and cam lobes due to marginal oil pressure and owners skipping changes. Proper fix requires all lifters, camshaft, and often cylinder head resurfacing if lobes wore into the head surface. Budget 12-16 hours labor for cam replacement with head work. Many shops find scoring on cam journals requiring head replacement.

Estimated cost: $2,200-3,800

Typical onset: 90,000-130,000 mi

Symptoms: Coolant loss with no visible leaks, White smoke from exhaust, Overheating especially under load, Milky oil or oil in coolant reservoir, Rough running and misfires

Fix: Head gasket fails between cylinders 2-3 most often, caused by marginal cooling system design and thin gasket material. Requires head removal, resurfacing (almost always warped .008-.015 inches), new head bolts, timing belt while you're in there. 10-14 hours labor. Check for cracks—some heads don't survive resurfacing and need replacement.

Estimated cost: $1,800-2,900

Typical onset: 60,000-100,000 mi

Symptoms: Severe clunking when shifting from Park to Drive, Vibration at idle in gear, Visible engine movement when revving, Difficult shifter engagement

Fix: The upper torque mount (transmission side) disintegrates from heat and vibration. Rubber separates completely leaving metal-on-metal contact. Simple replacement takes 1.5-2 hours, but inspect all three mounts—if one failed, others are usually close behind. Use OEM or better aftermarket; cheap mounts fail in 6 months.

Estimated cost: $180-350

Typical onset: 100,000-150,000 mi

Symptoms: Severe vibration especially at idle and low RPM, Squealing from serpentine belt area, Visible wobble of crankshaft pulley, Check engine light with crank position sensor codes

Fix: The rubber damper ring separates from the hub, causing the outer ring to wobble or completely detach. When it goes, it takes out the crank sensor, serpentine belt, and sometimes punctures the timing cover. Replacement requires special puller and installer tools—2.5-3.5 hours labor. Do NOT drive if wobbling; complete failure destroys the front of the engine.

Estimated cost: $350-650

Symptoms: Hard starting especially when hot, Sputtering and loss of power under acceleration, Stalling at idle or during deceleration, Fuel pump whining noise

Fix: These cars came from markets with questionable fuel quality and the filter clogs prematurely. Located under the car near the fuel tank, requires 0.8-1.2 hours to replace. Problem: many owners never change it (no reminder in maintenance schedule), leading to fuel pump failure. If pump fails from clogged filter, you're looking at 2.5-3 hours for pump replacement plus tank drop.

Estimated cost: $120-220 filter only, $450-750 if pump damaged

Typical onset: 60,000-100,000 mi

Symptoms: Engine suddenly won't start, cranks but no fire, Complete loss of power while driving, Loud slapping noise then immediate shutdown, Bent valves confirmed with compression test

Fix: This is an interference engine—when the belt goes, valves meet pistons and you need a complete top-end rebuild. Timing belt interval is 60,000 miles but many owners ignore it or buy used cars with unknown history. Prevention (belt, tensioner, water pump, seals) takes 4-5 hours. Full rebuild after failure: 18-25 hours including machine work, new valves, guides, head resurfacing.

Estimated cost: $450-700 preventive, $3,500-5,500 after failure