1988 PONTIAC 6000

Typical onset: 90,000-150,000 mi

Symptoms: Heavy knocking from bottom end, especially on cold start or acceleration, Metallic rattling that worsens under load, Low oil pressure warning, Sudden catastrophic failure with loss of power

Fix: The 2.8L suffers from inadequate oiling to rod bearings, leading to spun bearings and scored crankshafts. Proper fix requires engine removal (8-10 hours), full teardown, crank inspection/machining or replacement, new bearings, and typically new pistons/rings while you're in there. Most shops recommend a reman long block instead—6-8 hours R&R plus fluids and ancillaries.

Estimated cost: $2,800-4,500

Typical onset: 80,000-130,000 mi

Symptoms: Delayed or harsh 1-2 shift, Slipping in 3rd or 4th gear under load, No reverse or erratic reverse engagement, Burnt transmission fluid smell, Metal shavings on dipstick

Fix: The 4T60 in these cars had weak 3rd gear components and governor valve issues. Band-aid fix is fresh fluid and filter (2 hours), but once slipping starts you need a rebuild or replacement. Transaxle R&R is 10-12 hours due to tight FWD packaging, plus 8-10 hours rebuild time if doing in-house, or swap in a reman unit.

Estimated cost: $1,800-3,200

Typical onset: Any mileage (age-related)

Symptoms: Red fluid pooling under engine bay, driver's side, Low transmission fluid level on dipstick, Transmission overheating after highway driving, Visible corrosion or wetness on steel cooler lines

Fix: Steel cooler lines rust through where they route near the subframe. Replacement involves removing lines from radiator and transaxle (2-3 hours), fabricating or sourcing new lines, and refilling/bleeding system. Catch it early before the trans runs low and damages itself.

Estimated cost: $250-500

Typical onset: 70,000-120,000 mi

Symptoms: Coolant seepage at intake manifold edges, White residue or crusty buildup on block below intake, Slow coolant loss with no external puddles, Rough idle or misfire if coolant enters cylinders, Sweet smell from exhaust

Fix: GM's composite intake gaskets deteriorate and leak coolant externally or internally. Requires intake manifold removal, scraping old gaskets, and installing updated Felpro or OEM gaskets (4-5 hours). If coolant contaminated the oil, add oil change and possibly a flush.

Estimated cost: $450-750

Typical onset: 60,000-100,000 mi

Symptoms: Clunking when shifting from Park to Drive or Reverse, Excessive engine movement visible from under hood during acceleration, Vibration transmitted to cabin at idle, Transmission housing contacting subframe on hard launches

Fix: Rubber transmission mount deteriorates and allows excessive drivetrain movement. Requires supporting engine/trans with jack, removing old mount, and installing new mount (1.5-2 hours). Easy DIY job if you have the tools.

Estimated cost: $120-220

Typical onset: Any mileage (age/heat-related)

Symptoms: No-start with cranking but no fuel pressure, Intermittent stalling, especially when hot, Fuel gauge reading erratically or stuck, Engine dies after warmup then restarts when cool

Fix: Fuel pump relay under hood clicks but fails to energize pump, or in-tank pump/sender unit corrodes. Relay replacement is 0.3 hours. If pump is bad, tank must be dropped (3-4 hours) for sender/pump module replacement. Always test pressure first—don't guess.

Estimated cost: $150-650