1990 Mercedes-Benz 420SEL

Introduction to the 1990 Mercedes-Benz 420SEL

The 1990 Mercedes-Benz 420SEL is a luxury sedan that is known for its comfort, performance, and prestige. It is powered by a 4.2-liter V8 engine that produces 228 horsepower and 275 lb-ft of torque. The engine is paired with a 4-speed automatic transmission.

The 420SEL is well-regarded for its smooth ride quality, spacious interior, and powerful engine. However, like all vehicles, it is not without its issues.

Engine and Transmission

4.2-Liter V8

• Head gasket failure: The head gasket can fail, causing coolant and oil to leak. This can lead to overheating and engine damage. Symptoms include coolant leaks, oil leaks, and white smoke from the exhaust. The solution is to replace the head gasket. Estimated cost to fix: $1,500 - $2,500
• Timing chain tensioner failure: The timing chain tensioner can fail, causing the timing chain to jump and damage the engine. Symptoms include a rattling noise from the engine, difficulty starting, and reduced power. The solution is to replace the timing chain tensioner. Estimated cost to fix: $800 - $1,200
• Intake manifold gasket failure: The intake manifold gasket can fail, causing vacuum leaks and reduced engine performance. Symptoms include rough idle, poor acceleration, and increased fuel consumption. The solution is to replace the intake manifold gasket. Estimated cost to fix: $400 - $600

4-Speed Automatic Transmission

• Slipping gears: The transmission may slip gears, causing the vehicle to lose power or accelerate erratically. Symptoms include difficulty shifting gears, delayed engagement, and shuddering. The solution is to rebuild or replace the transmission. Estimated cost to fix: $2,000 - $4,000+
• Leaking fluid: The transmission may leak fluid, causing it to lose pressure and fail. Symptoms include slipping gears, difficulty shifting, and whining noises. The solution is to replace the seals or gaskets that are leaking. Estimated cost to fix: $500 - $1,000+

Suspension

• Front suspension strut failure: The front suspension struts can fail, causing the vehicle to ride rough and handle poorly. Symptoms include excessive bouncing, clunking noises, and uneven tire wear. The solution is to replace the suspension struts. Estimated cost to fix: $1,000 - $1,500 per strut
• Rear shock absorber failure: The rear shock absorbers can fail, causing the vehicle to ride rough and handle poorly. Symptoms include excessive bouncing, clunking noises, and uneven tire wear. The solution is to replace the shock absorbers. Estimated cost to fix: $500 - $800 per shock absorber

Electrical

• Alternator failure: The alternator can fail, causing the battery to not charge. Symptoms include dim headlights, difficulty starting, and a warning light on the dashboard. The solution is to replace the alternator. Estimated cost to fix: $500 - $800
• Starter failure: The starter can fail, preventing the engine from starting. Symptoms include difficulty starting, grinding noises, and a warning light on the dashboard. The solution is to replace the starter. Estimated cost to fix: $400 - $600

Exterior

• Rust: The body of the vehicle can rust, especially in areas that are exposed to salt or moisture. Symptoms include bubbling paint, rust spots, and holes in the body panels. The solution is to repair or replace the rusted parts. Estimated cost to fix: Varies depending on the extent of the damage

Interior

• Cruise control switch failure: The cruise control switch can fail, preventing the driver from using the cruise control system. Symptoms include an inoperable cruise control switch or intermittent cruise control operation. The solution is to replace the cruise control switch. Estimated cost to fix: $400 - $600

Summary

The 1990 Mercedes-Benz 420SEL is a reliable and well-built vehicle, but it is not without its issues. The most common problems are related to the engine, transmission, and suspension. The severity of the issues can vary, but most of them are relatively minor and can be fixed for a reasonable cost. Overall, the 420SEL is a good choice for those who are looking for a comfortable and luxurious sedan.