1979 PONTIAC CATALINA

Typical onset: 80,000-150,000 mi

Symptoms: Transmission fluid in radiator or coolant in trans pan, Harsh or delayed shifts, slipping in 2nd gear, Pink milky fluid on dipstick indicating coolant contamination

Fix: Common failure is the internal radiator transmission cooler rupturing, cross-contaminating fluids and destroying the trans. Requires radiator replacement, external cooler addition, full transmission rebuild with torque converter. Expect 12-16 hours labor total.

Estimated cost: $2,200-3,800

Typical onset: 100,000-180,000 mi

Symptoms: Heavy blue smoke on startup or under load, Rod knock or main bearing rumble, especially when hot, Oil pressure dropping below 10 psi at idle, Excessive crankcase pressure, oil pushing out of dipstick tube

Fix: The Pontiac 301 and Olds 350/403 engines suffer from soft cam cores and bearing wear. Rings wear due to poor oil control. Full rebuild requires crankshaft inspection/possible turning, new bearings, piston rings or pistons, timing set, oil pump. Long blocks are rare; expect 20-28 hours labor for in-frame rebuild.

Estimated cost: $3,500-6,500

Symptoms: Black smoke, flooding, fuel smell in garage, Hard starting when hot, long cranking, Stalling at idle or during turns, Poor fuel economy below 10 mpg

Fix: The Quadrajet carbs need rebuilds every 10-15 years even with low miles due to ethanol fuel degrading internal components, float needles, and accelerator pump. Professional rebuild with proper jetting takes 3-5 hours. DIY kits exist but tuning is critical.

Estimated cost: $450-850

Symptoms: Fuel smell inside cabin or under car, Engine stumbling or dying under acceleration, Rust flakes in fuel filter, Visible corrosion on steel fuel lines along frame

Fix: Steel fuel lines and original tanks rust through after decades. Sending unit seals leak. Full system service means tank drop, boil-out or replacement, new sending unit, steel line replacement from tank to pump. 6-10 hours labor depending on line routing and rust.

Estimated cost: $800-1,600

Symptoms: Clunking when shifting into drive or reverse, Excessive engine movement visible under throttle, Vibration through floor at idle, Transmission crossmember hitting frame on rough roads

Fix: All rubber mounts are original or ancient. Engine mounts collapse, transmission mount tears. Not dangerous but causes driveline slop and vibration. Replace all three mounts as a set. 2-3 hours labor.

Estimated cost: $350-600

Typical onset: 90,000-140,000 mi

Symptoms: Steering fluid dripping from gear box area, Excessive play in steering wheel, more than 2 inches, Wandering on highway requiring constant correction, Groaning noise when turning at low speed

Fix: Saginaw steering boxes wear internally and leak from sector shaft seal. Rebuild kits available but many techs swap in a rebuilt unit. Requires alignment after. 4-5 hours labor for R&R.

Estimated cost: $450-900