1990 MAZDA B2200

Typical onset: 150,000-250,000 mi

Symptoms: heavy knocking on cold start that may quiet down when warm, metallic rattle under load, oil pressure drop, metal shavings in oil filter

Fix: Requires full teardown to replace rod and main bearings, or short block swap if crank is scored. Budget 12-16 hours for in-frame bearing replacement, 18-24 hours for short block swap including all gaskets, timing components, and oil pump. High-mileage engines that were run low on oil or overheated are most vulnerable.

Estimated cost: $1,800-3,500

Typical onset: 120,000-180,000 mi

Symptoms: white smoke from exhaust, coolant mixing with oil (milky dipstick), overheating under load, external coolant seepage at head/block junction, rough idle and misfiring

Fix: Head removal, resurface, new gasket set, and timing belt replacement since you're in there. Always check for cracks and warpage; F2 heads warp easily. Plan 10-14 hours including machine shop time. Root cause is almost always cooling system neglect—bad radiator, stuck thermostat, or failed water pump.

Estimated cost: $1,200-2,200

Typical onset: 80,000-140,000 mi

Symptoms: delayed engagement when cold, slipping between gears, burnt ATF smell, visible leak at radiator cooler connections, transmission running hot

Fix: Factory cooler inside radiator is marginal and lines rust through at fittings. Replace cooler lines, add external cooler, flush system. If caught early, 3-4 hours. If transmission is already slipping from heat damage, you're looking at rebuild or replacement (12-16 hours). Manual transmission trucks avoid this entirely.

Estimated cost: $400-800 (lines/cooler), $1,800-2,800 (rebuild)

Symptoms: hard starting when cold, stumbling acceleration, high idle or hunting idle, black smoke, poor fuel economy, hesitation under load

Fix: The Nikki carburetor gets varnish buildup and worn throttle shafts. Professional rebuild runs 4-6 hours including removal, bench work, and tuning. Vacuum leaks at intake gaskets and cracked hoses complicate diagnosis. Fuel filter plugging is common if tank has rust. Carb-savvy techs are getting rare.

Estimated cost: $450-900

Typical onset: 100,000-160,000 mi

Symptoms: gradual temperature creep, coolant loss with no visible leak, heater performance loss, radiator end tank cracking, water pump weeping

Fix: Original plastic-tank radiators crack, water pumps seize, thermostats stick. The problem is owners ignore small leaks until overheating warps the head or cooks the bearings. Preventive cooling system overhaul (radiator, water pump, thermostat, hoses, flush) takes 5-7 hours and prevents $3,000+ engine repairs.

Estimated cost: $600-1,100

Typical onset: 80,000-150,000 mi

Symptoms: clunk when shifting into drive or reverse, excessive driveline vibration, visible rubber separation or cracking, transmission sag visible from underneath

Fix: Rubber mounts harden and tear. Simple replacement job, 1-2 hours. Often found during other transmission work. Does not cause breakdown but contributes to U-joint wear if ignored long-term.

Estimated cost: $150-280