1990 CHRYSLER IMPERIAL

Typical onset: 60,000-100,000 mi

Symptoms: Sudden knocking or rattling from engine block, Severe oil pressure drop, Metal shavings in oil, Complete engine seizure without warning

Fix: The 3.8L in these Imperials has a fundamental oiling system design flaw where bearing surfaces get starved, especially the crankshaft main bearings. Once knocking starts, it's typically already damaged the crank journals. Full engine rebuild or short block replacement required - expect 18-24 hours labor for a proper rebuild including machine work, or 12-15 hours for short block swap.

Estimated cost: $3,500-6,500

Typical onset: 70,000-110,000 mi

Symptoms: Pink or milky transmission fluid, Transmission slipping or erratic shifting, Coolant level dropping without external leaks, Foamy coolant in overflow tank

Fix: The internal transmission cooler in the radiator fails, allowing coolant and ATF to mix - this destroys the A-604 four-speed automatic quickly. Requires radiator replacement, complete transmission flush or rebuild if contamination progressed, and all cooler lines flushed. If caught early (cooler only): 4-5 hours. If transmission damaged: add 12-16 hours for rebuild.

Estimated cost: $800-1,200 (cooler only); $2,800-4,200 (with transmission rebuild)

Typical onset: 80,000-130,000 mi

Symptoms: ABS warning light illuminated constantly, Grinding or motor noise from ABS pump under hood, Firm brake pedal with reduced stopping power, Pump runs continuously even when parked

Fix: The Bendix-10 ABS system's hydraulic pump and accumulator assembly fails, often due to internal seal deterioration. Replacement pump/module is the only real fix - used units are scarce and new old stock is expensive. Brake system must be bled properly with scan tool. 3-4 hours labor.

Estimated cost: $1,200-2,000

Typical onset: 90,000-140,000 mi

Symptoms: White smoke from exhaust, Coolant loss with no visible leaks, Overheating under load, Oil cap shows milky residue, Rough idle and misfires

Fix: The 3.8L head gaskets fail due to the engine's heat cycling issues and marginal cooling system design. Both heads should be done simultaneously, including resurfacing and pressure testing. If heads are warped beyond spec, this becomes an engine-out job. 14-18 hours labor for proper repair with heads resurfaced.

Estimated cost: $2,200-3,500

Symptoms: Speedometer reads incorrectly or not at all, Fuel gauge erratic or stuck, Odometer stops working, Warning lights illuminate randomly, Complete cluster blackout

Fix: The digital/vacuum fluorescent instrument cluster develops cold solder joints and component failures on the circuit boards. Cluster must be removed and either sent out for rebuild or replaced with used unit. DIY-friendly if you can solder; otherwise send to specialist. 2 hours removal/reinstall plus rebuild time.

Estimated cost: $350-650 (rebuilt exchange)

Typical onset: 100,000-150,000 mi

Symptoms: No-start condition with crank but no fire, Engine stumbling or cutting out at highway speed, Fuel gauge reading empty when tank is full, Whining noise from rear of vehicle

Fix: In-tank fuel pump fails due to age and running on ethanol fuel which wasn't common when designed. Requires fuel tank drop on this platform. The sending unit and pump are typically replaced as an assembly. 3-4 hours labor.

Estimated cost: $500-800

Typical onset: 60,000-100,000 mi

Symptoms: Severe clunking when shifting from park to drive, Vibration at idle in gear, Visible engine/transmission movement when revving, Difficulty engaging gears smoothly

Fix: The A-604 transmission is heavy and the rubber mounts deteriorate badly, especially the rear mount. This allows excessive powertrain movement that accelerates wear on other components. Front and rear mounts should be done together. 2-3 hours labor.

Estimated cost: $300-500