1978 DODGE MONACO

Typical onset: Any mileage—age-related deterioration

Symptoms: Intermittent stalling or no-start conditions, especially when hot, Rough idle, hesitation, poor fuel economy, Check engine light (if equipped) or erratic performance, Computer module corrosion from under-hood heat cycling

Fix: Most techs bypass the troublesome Lean Burn system entirely and retrofit a traditional points-style or later electronic distributor with aftermarket ignition. Complete conversion takes 3-4 hours including tuning. Alternatively, replacing the ECU and all sensors runs 2-3 hours but reliability remains questionable.

Estimated cost: $350-700

Typical onset: 80,000-140,000 mi

Symptoms: Rattling noise from front of engine on cold start that subsides when warm, Rough idle, backfiring, or difficulty starting, Check timing with light—retarded 10+ degrees indicates worn chain, Metal shavings in oil or timing cover area

Fix: Requires timing cover removal, new chain, gears, and tensioner. On V8s, expect 5-7 hours labor; slant-six takes 4-5 hours. Always replace oil pump and front seal while you're in there. Critical: use double-roller chain kit, not OEM-style single roller.

Estimated cost: $600-1,200

Symptoms: Flooding, fuel leaks from phenolic float bowl warping, Hesitation off idle, flat spots during acceleration, Hard starting when hot due to heat soak, Fuel smell in cabin or engine bay

Fix: The plastic-bodied Thermoquad is heat-sensitive and warps over time. Rebuilding takes 2-3 hours but often fails again within a year. Better solution: swap to Edelbrock 1406 carburetor (600 cfm) with adapter plate—bolt-on upgrade taking 1.5 hours.

Estimated cost: $450-750

Typical onset: 70,000-120,000 mi

Symptoms: Sagging front end, uneven ride height side-to-side, Clunking over bumps from worn upper control arm bushings, Wandering, poor steering return, Tire wear on inside edges

Fix: Torsion bars rarely fail but adjusters seize. Upper control arm bushings and ball joints wear together. Complete front end rebuild with both upper/lower ball joints, bushings, tie rods, and alignment takes 6-8 hours. Seized torsion bar adjusters add 1-2 hours.

Estimated cost: $900-1,500

Symptoms: Visible rust perforation in trunk corners and rear wheel wells, Rear shock mounts pulling through weakened metal, Sagging rear end, alignment impossible to maintain, Creaking or popping from rear suspension under load

Fix: C-body unibody construction traps moisture in rear subframe rails and trunk floor. Inspection requires removing trunk mat and spare tire well. Proper repair involves cutting out sections and welding in new metal—10-20 hours depending on extent. Structural integrity issue; cannot be ignored.

Estimated cost: $1,500-3,500

Typical onset: 60,000-100,000 mi

Symptoms: Transmission won't downshift for passing power, Late or harsh 2-3 upshift, Sticking throttle return, Binding felt at carburetor linkage

Fix: The mechanical kickdown linkage from carburetor to transmission corrodes and binds at pivot points. Cleaning and lubricating takes 1 hour; replacing worn bushings and adjusting properly takes 1.5-2 hours. Crucial for transmission longevity—improper adjustment causes premature clutch wear.

Estimated cost: $150-300

Typical onset: 80,000-150,000 mi

Symptoms: Power steering fluid leaking from sector shaft seal, Excessive play in steering wheel (more than 2 inches), Groaning noise when turning at idle, Frequent topping-off of fluid reservoir

Fix: Chrysler recirculating ball steering boxes wear internally and leak. Rebuilding or replacing takes 3-4 hours including alignment. Sector shaft adjustment can tighten play temporarily (0.5 hours) but leak requires seal replacement or reman unit.

Estimated cost: $400-800