1993 HONDA CIVIC SI

Typical onset: 120,000-180,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leaks, rough idle when cold, milky oil on dipstick or cap

Fix: Head gasket replacement requires 8-10 hours labor, machine shop resurfacing the head ($150-250), new timing belt while you're in there, ARP studs recommended over OEM bolts. Many shops will pressure-test and do valve seals at same time since head is off.

Estimated cost: $1,200-2,000

Typical onset: 100,000+ mi

Symptoms: oil pooling on valve cover near VTEC solenoid, low oil light if leak is severe and ignored, VTEC not engaging above 5,800 RPM due to low pressure

Fix: Simple 1-hour job to replace the small gasket and clean the solenoid screen. Most techs do this during any valve cover work. Use genuine Honda gasket, aftermarket ones leak again quickly.

Estimated cost: $120-200

Typical onset: 80,000-150,000 mi

Symptoms: grinding when shifting into 2nd gear, especially when cold, difficulty engaging 3rd under hard acceleration, crunching on downshifts

Fix: Cable-operated S20 transmission with brass synchros that wear from spirited driving. Full rebuild is 6-8 hours labor plus $800-1,200 in synchro rings, bearings, seals. Many owners swap in a JDM Y1 or Y80 transmission instead (4-5 hours labor).

Estimated cost: $1,500-2,200

Typical onset: any mileage on original mounts

Symptoms: clunking when shifting or accelerating hard, excessive engine movement visible from engine bay, vibration at idle that smooths out above 2,000 RPM, difficulty shifting into gear

Fix: OEM rubber mounts disintegrate after 20+ years. Right-side engine mount and rear transmission mount are worst offenders. Both together are 2-3 hours labor. Upgraded polyurethane mounts add NVH but last forever.

Estimated cost: $350-600

Typical onset: any mileage if never replaced

Symptoms: oil dripping from back of engine onto exhaust manifold, burning oil smell in cabin, oil accumulation on firewall side of block

Fix: The distributor housing O-ring hardens and leaks oil down the back of the block. Requires removing distributor, 1.5 hours labor. Critical to mark distributor position or you'll spend another hour getting timing right. Replace cam seal and valve cover gasket while you're there.

Estimated cost: $250-400

Typical onset: varies—abuse and maintenance dependent

Symptoms: knocking sound from bottom end that increases with RPM, metal shavings in oil, sudden loss of oil pressure, engine seizure in worst cases

Fix: B16A engines with extended oil change intervals or hard track use can spin bearings, especially rod bearing #3. Requires full bottom-end rebuild or short block replacement, 16-20 hours labor. Machine work (crank grinding, align honing) adds $600-1,000. Many owners source JDM B16A blocks instead.

Estimated cost: $3,000-5,500

Typical onset: 150,000+ mi or cars sitting long periods

Symptoms: no start or intermittent starting, engine dies under load or wide-open throttle, whining noise from rear seat area, fuel pressure drops below 40 PSI

Fix: OEM pumps fail from age and ethanol fuel degradation. Accessed through rear seat, 1.5-2 hours labor including dropping tank on some cars depending on rust. Walbro 255 is common upgrade but overkill for stock setup.

Estimated cost: $300-500