1999 Chevrolet Camaro Problems: 4 Known Issues

On the 1994-1999 Chevrolet Camaro, the electronically controlled 4L60E four-speed automatic behind the V6, LT1 and LS1 Camaros has two well-known failure points. The 3-4 clutch pack burns out first: the drum has limited space and thin factory friction plates that wear rapidly under heat and load, so the trans shifts fine through 1st and 2nd but slips or feels like neutral going into 3rd/4th, often with RPM flare on the 2-3 shift. The second is the 'sun shell' (reaction shell), a stamped part prone to fracturing at the hub — when it breaks you typically lose 2nd, 4th and Reverse at once, dropping to 1st and 3rd only. Heat is the primary accelerant on these transmissions; degraded fluid speeds both failures.

On the 1993-1999 Chevrolet Camaro, the in-tank fuel pump module on 4th gen Camaros — which combines the pump, the fuel-level sending unit, strainer and internal wiring — is a common wear item, and its sending unit is a chronic source of an inaccurate or erratic fuel gauge. Owners report the gauge reading empty with fuel in the tank, jumping around, or dropping suddenly. The gauge inaccuracy is aggravated by the wedge shape of the tank and by the aging sending-unit resistor card, while the pump itself eventually weakens (long crank, stalling, high-speed fuel starvation). Because these parts are 25+ years old, failure is treated as routine maintenance.

On the 1998-2001 Chevrolet Camaro 5.7L LS1 V8, the all-aluminum 5.7L LS1 that arrived in the 1998 Camaro is durable, but early cars are documented to consume oil at a high rate, sometimes 400-600 miles per quart, most often on cars driven hard where the engine frequently spins above ~3,200 RPM (typically 6-speed manual cars). GM traced it to ring 'flutter' — an interaction between the factory oil-control rings and the cylinder bore that lets the ring lose contact with the bore and pass oil. Some engines also exhibit cold-start 'piston slap' (a light knock on startup that quiets as the engine warms) from the short-skirt piston rocking on the wrist pin at cold piston-to-bore clearance. GM issued TSB 01-06-01-023 covering the 1999-2001 Camaro/Firebird LS1 for higher-than-expected oil consumption and revised the pistons/rings for later production.

On the 1990-1999 Chevrolet Camaro, t-top-equipped Camaros are widely documented to leak water into the cabin, and the rear hatch on the coupe leaks as well. The T-top leaks are almost never at the glass-to-weatherstrip contact but where the weatherstripping meets the body: the foam-rubber seal under the weatherstrip breaks down with age and stops sealing, so water runs down the interior trim near the rear of the door/seatbelt area and pools in the rear floor or back-seat well. Separately, the rear hatch leaks from clogged drainage gutters behind the hatch and from the hatch-glass bond, letting water collect and run into the cargo area. Left unaddressed the standing water rusts floor pans and rots carpet.