1971 BMW 2002TII

Symptoms: hard starting when cold or hot, rough idle and stumbling under load, fuel weeping from injection pump seals, complete loss of fuel delivery

Fix: The Kugelfischer pump uses precise machined tolerances that wear over decades and cannot tolerate modern ethanol fuel. Rebuild requires specialized knowledge (not all shops can do this) and takes 8-12 hours including removal, rebuild, and precise timing/adjustment. Many owners convert to Weber carburetors (6-8 hours) as a more reliable alternative.

Estimated cost: $2,500-4,500

Typical onset: 100,000-150,000 mi

Symptoms: knocking or rumbling from crankcase especially when cold, low oil pressure at idle when warmed up, metallic rattling on acceleration, visible metal particles in oil

Fix: The M10 engine's main and rod bearings wear, often exacerbated by years of infrequent oil changes by previous owners. Full rebuild requires 18-25 hours: engine removal, complete teardown, new bearings, piston rings, timing chain, oil pump, gaskets, and machine work if journals are scored. Many owners do complete rebuilds or swap in already-rebuilt short blocks.

Estimated cost: $4,500-7,500

Symptoms: clunking when engaging clutch or shifting, excessive vibration at idle in gear, visible engine movement when revving, driveline shudder during acceleration

Fix: Rubber transmission mount, engine mounts, and driveshaft center bearing (guibo) all degrade over decades. Transmission mount replacement takes 2-3 hours and requires supporting the transmission. Often done alongside engine mounts and guibo for comprehensive refresh (5-7 hours total for all drivetrain mounts).

Estimated cost: $600-1,200

Typical onset: 80,000-120,000 mi

Symptoms: grinding into second gear especially when cold, difficulty engaging third gear, gear pop-out under deceleration, crunching when downshifting

Fix: The Getrag 232 transmission's synchros wear from decades of use and abuse. Complete rebuild takes 12-16 hours including removal, disassembly, replacing synchros, bearings, seals, and proper setup of gear lash. Second gear synchro fails most frequently.

Estimated cost: $2,200-3,500

Typical onset: 80,000-140,000 mi

Symptoms: blue smoke on startup that clears after warmup, oil consumption 1 quart per 500-800 miles, smoke on deceleration, fouled spark plugs

Fix: Valve guides wear oval and seals harden with age, allowing oil into combustion chambers. Head removal, valve job, new guides, seals, and resurfacing takes 10-14 hours. Often done during engine rebuild, but can be addressed standalone if bottom end is healthy.

Estimated cost: $1,800-2,800

Symptoms: intermittent stalling or stumbling, loss of power at highway speeds, difficulty starting after sitting, fuel smell in cabin or engine bay

Fix: Decades-old fuel lines, rubber hoses, and tank liners shed debris that clogs the tii's inline fuel filter and injection pump screens. Filter replacement is simple (0.5 hours), but comprehensive fuel system refresh including all hoses, tank cleaning or replacement, and pump screen cleaning takes 6-10 hours. Ethanol fuel accelerates deterioration.

Estimated cost: $400-1,500