2007 MASERATI GRANTURISMO

Typical onset: 40,000-80,000 mi

Symptoms: Coolant consumption without visible leaks, White smoke from exhaust on cold starts, Milky oil on dipstick or cap, Misfires and rough idle as coolant floods cylinders

Fix: Factory liners are porous castings that allow coolant seepage into combustion chambers. Requires complete engine-out teardown, liner replacement or sleeving, head gaskets, piston rings, and machine work. 50-70 labor hours at specialized shops. Many owners opt for used engines from later years or aftermarket sleeved blocks.

Estimated cost: $15,000-25,000

Typical onset: 50,000-90,000 mi

Symptoms: Transmission slipping or erratic shifting, Overheating transmission fluid, Pink or milky transmission fluid (coolant cross-contamination), Check engine light with trans temp codes

Fix: The ZF 6-speed auto shares coolant passages with the engine cooler; internal rupture mixes coolant and ATF, destroying the transmission. Requires cooler replacement, full trans flush or rebuild if contamination occurred, plus all affected hoses. If caught early (cooler only), 8-12 hours labor. If trans is damaged, add rebuild at 25-35 hours.

Estimated cost: $2,500-4,500 (cooler only), $8,000-14,000 (with trans rebuild)

Typical onset: 60,000-100,000 mi

Symptoms: Clunking on acceleration or deceleration, Vibration through center tunnel at idle, Visible sagging of transmission when inspected on lift

Fix: Rear transaxle mount (it's a front-engine, rear-transaxle layout) deteriorates from heat and stress. Requires lift, exhaust removal for access, 4-6 hours labor. OEM Maserati part required for proper fitment.

Estimated cost: $800-1,400

Typical onset: 70,000-110,000 mi

Symptoms: Check engine light with cam position codes (P0010, P0011), Rough idle and hesitation, Ticking or rattling from valve covers on cold starts

Fix: Variable valve timing solenoids clog or fail; screens in the solenoids trap debris from degraded oil. Requires valve cover removal, solenoid replacement, and oil system flush. 6-8 hours labor for both banks. Often coincides with cam variator actuator wear.

Estimated cost: $1,500-2,800

Symptoms: Stumbling or surging under load, Intermittent stalling, Hard starts after sitting

Fix: In-tank fuel pump pre-filter and external filter clog from tank sediment or degraded hose linings. External filter is serviceable (under car near tank, 2-3 hours), but chronic issues require tank drop and pump module cleaning or replacement (8-10 hours). Maserati did not prioritize fuel filter service intervals.

Estimated cost: $400-800 (filter), $1,800-3,000 (pump module)

Typical onset: 80,000-120,000 mi

Symptoms: Blue smoke on deceleration or startup, Oil consumption 1 qt per 1,000-1,500 miles, Fouled spark plugs on one bank

Fix: Valve guides wear, allowing oil to seep past valve stems into combustion chambers. Not as catastrophic as liner failure but requires head removal, guide replacement, valve job, and new seals. 20-30 hours labor for both banks if caught before damage to cats.

Estimated cost: $6,000-10,000