1991 CHEVROLET CAMARO RS

Typical onset: 120,000-180,000 mi

Symptoms: knocking or ticking from crankcase especially when cold, low oil pressure at idle, metallic rattling during acceleration, oil consumption increasing dramatically, coolant mixing with oil (head gasket failure secondary to overheating)

Fix: The 3.1L suffers from main and rod bearing wear, often accompanied by piston ring failure and scored cylinder walls. Real fix requires engine rebuild or short block replacement—12-16 hours labor for R&R plus machine work. Many shops recommend used engine swap instead due to age and parts availability challenges.

Estimated cost: $2,800-4,500

Typical onset: 90,000-150,000 mi

Symptoms: white smoke from exhaust, coolant loss with no visible leaks, oil in coolant reservoir or milky oil, overheating under load, rough idle and misfires

Fix: The 3.1L V6 head gaskets fail from age and thermal cycling. Both heads should be done simultaneously—8-10 hours labor. Heads often need resurfacing ($150-250). If overheating damage occurred, may need full rebuild instead.

Estimated cost: $1,200-1,800

Typical onset: 80,000-140,000 mi

Symptoms: transmission fluid puddles under front of car, low transmission fluid warnings, transmission slipping or delayed engagement, rust stains on radiator or frame rails

Fix: Steel cooler lines rust through where they route along the frame, particularly at mounting clips. Lines should be replaced in pairs with new rubber sections—2-3 hours labor. Inspect radiator-mounted cooler for internal leaks while you're there.

Estimated cost: $250-450

Typical onset: 70,000-120,000 mi

Symptoms: clunking when shifting from park to drive, excessive drivetrain vibration at idle, visible tearing or separation of rubber mount, transmission tailshaft sitting low or contacting crossmember

Fix: The rubber transmission mount collapses from age and heat exposure from exhaust proximity. Replacement requires supporting transmission—1.5-2 hours labor. Check engine mounts simultaneously as they fail similarly.

Estimated cost: $180-320

Symptoms: hard starting after sitting, stumbling or hesitation during acceleration, stalling at idle after warmup, fuel pressure dropping off under load

Fix: These cars often sit for extended periods now, leading to varnish buildup in fuel lines and injectors. Fuel filter replacement is 1 hour labor, but injector cleaning or replacement may be needed. In-tank pump can also be affected—3-4 hours for pump R&R.

Estimated cost: $150-650

Typical onset: 60,000-100,000 mi

Symptoms: no start condition, random misfires and stumbling, stalling when engine is hot, moisture inside distributor cap

Fix: Some late 1991 models may have early LT1 installation with Optispark (verify your build date). This optical distributor sits low behind water pump and fails from moisture intrusion. Replacement requires water pump removal—4-5 hours labor. Most 3.1L models use standard HEI distributor.

Estimated cost: $450-750