1997 PLYMOUTH NEON

Typical onset: 60,000-100,000 mi

Symptoms: White smoke from exhaust, especially on cold start, Coolant loss with no visible leaks, Overheating or temperature fluctuations, Milky oil on dipstick or cap (coolant mixing with oil), Rough idle and loss of power

Fix: Head gasket replacement requires removing the cylinder head, resurfacing if warped, and new timing belt while you're in there. Budget 8-10 hours labor. Many shops recommend doing both gaskets even if only one side shows symptoms since the second often follows within 20k miles.

Estimated cost: $1,200-2,000

Typical onset: 80,000-120,000 mi

Symptoms: Slipping between gears, especially 2nd to 3rd, Harsh or delayed engagement from Park to Drive, Whining or grinding noise in gear, Transmission overheating (external cooler often clogs), No movement in any gear (complete failure)

Fix: The 3-speed automatic is undersized for this car's weight and fails frequently. Rebuild kits exist but labor runs 12-15 hours. Used replacements are common but often have similar mileage. Many owners swap to the manual transmission if the chassis is otherwise solid. External cooler line leaks are a precursor—address immediately.

Estimated cost: $1,800-3,200

Typical onset: 100,000-150,000 mi

Symptoms: Knocking noise from bottom end, worsens with RPM, Low oil pressure warning at idle when engine is hot, Metallic rattling on cold start that doesn't go away, Oil pan full of metal shavings during oil change

Fix: Usually caused by infrequent oil changes or running low on oil. Requires engine removal and full teardown to replace main bearings and potentially regrind or replace the crankshaft. If crank needs machining, add another $300-500. Many techs recommend a short block replacement instead at this point—labor is similar at 18-22 hours.

Estimated cost: $2,500-4,500

Typical onset: 90,000-130,000 mi

Symptoms: Blue smoke on acceleration or deceleration, Burning through 1+ quart of oil every 500-800 miles, Fouled spark plugs, Loss of compression (rough idle, poor performance)

Fix: Rings wear prematurely on engines that have overheated (see head gasket problem). Requires removing head, honing cylinders, and installing new rings on all pistons. Labor around 10-12 hours. If cylinder walls are scored, you're looking at a full rebuild or short block swap.

Estimated cost: $1,500-2,800

Typical onset: 70,000-110,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive engine movement visible from hood when revving, Vibration through cabin at idle, Difficulty shifting (manual transmission cars)

Fix: The hydraulic engine mounts and rubber transmission mounts deteriorate and collapse. Front mount is most common. Straightforward replacement, 2-3 hours labor for all three mounts. Do them all at once—if one's gone, the others are close behind.

Estimated cost: $350-600

Symptoms: Hesitation or stumbling under acceleration, Hard starting after sitting overnight, Stalling at idle or when coming to a stop, Check engine light with lean fuel codes

Fix: In-line filter clogs from tank sediment, especially if the car sat for long periods. Replace every 30k miles as preventive maintenance. Takes 30-45 minutes. On high-mileage cars, consider dropping the tank and cleaning it if filter clogs repeatedly.

Estimated cost: $80-150