1994 HONDA CIVIC SI

Typical onset: 120,000-180,000 mi

Symptoms: White smoke from exhaust, especially on cold start, Coolant mixing with oil (milky dipstick), Overheating under load or sustained highway speed, External coolant weeping between head and block

Fix: Head gasket replacement requires removing the head, machining for flatness (often warped .003-.008"), new gasket set, timing belt, and water pump while you're in there. Budget 8-12 hours labor. If the head is cracked or the block deck is damaged, you're looking at a used head or short block swap.

Estimated cost: $1,200-2,500

Typical onset: 100,000-150,000 mi

Symptoms: Loss of power above 5,800 RPM (VTEC not engaging), Check engine light with P1259 code (VTEC system malfunction), Rattling noise from valve cover at higher RPM, Intermittent engagement, feels like a misfire at crossover

Fix: Often it's just a clogged solenoid screen or stuck spool valve from neglected oil changes. Remove valve cover, clean or replace solenoid assembly and screen, inspect rocker arms for VTEC pin wear. 2-3 hours labor. If the rocker arm is damaged, expect another $200-400 in parts.

Estimated cost: $250-600

Typical onset: 80,000-140,000 mi

Symptoms: Grinding when shifting into 2nd gear, especially when cold, Hard to engage 3rd gear under quick shifts, Crunching noise during downshifts, Eventually pops out of 2nd gear under load

Fix: The S20/S40 cable transmission is known for weak 2nd gear synchros, made worse by aggressive driving and missed shifts. Rebuild requires trans removal, disassembly, synchro ring and hub replacement. 6-8 hours labor. Many owners just swap in a used trans from a junkyard Si or Integra (easier/cheaper). Full rebuild with all new synchros runs higher.

Estimated cost: $800-1,800

Typical onset: 80,000-120,000 mi

Symptoms: Clunking over bumps from front suspension, Steering wanders or pulls on acceleration/braking, Uneven inner tire wear, Visible cracking or tearing in rubber bushings during inspection

Fix: The rear bushing in the front lower control arms deteriorates with age and use. You can press in new bushings (specialty tool required) or replace the entire arm. Most techs just replace the arms with OEM or aftermarket units for speed. 2-3 hours labor plus alignment.

Estimated cost: $400-700

Symptoms: Hard starting or no-start when hot, Misfiring, bucking, or stumbling under load, Stalling at idle after warm-up, Visible carbon tracking or cracks inside distributor cap

Fix: The OBD-1 internal coil distributor is prone to heat-related failures, especially if the car has sat or been exposed to moisture. Replace cap, rotor, and if misfires persist, swap the entire distributor assembly. 1-2 hours labor. Common enough that many owners keep a spare distributor.

Estimated cost: $200-500

Typical onset: 100,000-160,000 mi

Symptoms: Intermittent stalling, especially when fuel tank is under 1/4 full, Loss of power at high RPM or under load, Long cranking before engine fires, Whining noise from rear of car

Fix: The in-tank fuel pump is accessed by removing the rear seat and an access panel. Test fuel pressure first (should be 40-47 psi). If pump is weak or noisy, replace with OEM-spec unit and fuel filter. 2-3 hours labor. While you're in there, replace the fuel strainer sock in the tank.

Estimated cost: $300-600

Typical onset: 70,000-120,000 mi

Symptoms: Excessive vibration at idle, especially with A/C on, Clunking when shifting or engaging clutch, Engine rocks noticeably during acceleration/deceleration, Shifter feels loose or notchy

Fix: The hydraulic engine mounts and rubber trans mount degrade over time. Most owners replace all four mounts (front, rear, side, trans mount) at once. Street-driven cars: use OEM-style hydraulic mounts. Track/autocross cars often go solid or urethane (harsher). 3-4 hours labor for all four.

Estimated cost: $400-800