1990 GMC R2500 Suburban

Introduction The 1990 GMC R2500 Suburban is a full-size SUV that offered two engine options paired with two transmission options. The standard engine is a 5.7L V8 producing 210 horsepower and 300 lb-ft of torque. The optional engine is a 7.4L V8 producing 230 horsepower and 380 lb-ft of torque. Both engines are paired with a 4-speed automatic transmission (4L80E) or a 5-speed manual transmission (NV4500).

The GMC R2500 Suburban is known for its spacious interior, powerful engines, and rugged durability. However, like all vehicles, it has its share of issues.

Engine

5.7L V8

• Intake manifold gasket failure: Failure of the gasket between the intake manifold and engine block, resulting in coolant and oil leaks, as well as reduced engine performance.
  • Solution: Replacement of the intake manifold gasket
  • Estimated Cost to Fix: $200 - $400+
• Throttle position sensor (TPS) failure: Malfunction of the TPS, causing erratic engine performance, idle issues, and stalling.
  • Solution: Replacement of the TPS
  • Estimated Cost to Fix: $100 - $200+
• Distributor cap and rotor failure: Worn or cracked distributor cap and rotor, leading to ignition problems, misfires, and engine stalling.
  • Solution: Replacement of the distributor cap and rotor
  • Estimated Cost to Fix: $50 - $150+

7.4L V8

• Excessive oil consumption: Some 7.4L V8 engines may experience high oil consumption, requiring frequent oil changes to maintain proper levels.
  • Solution: Replacement of worn or damaged piston rings or valve seals
  • Estimated Cost to Fix: $500 - $1,500+
• Valve train noise: Noisy valve train due to worn or damaged rocker arms, pushrods, or lifters.
  • Solution: Replacement of affected components
  • Estimated Cost to Fix: $200 - $600+

Transmission

4L80E 4-Speed Automatic

• Torque converter shudder: Vibration or shuddering during acceleration due to a worn or damaged torque converter.
  • Solution: Replacement of the torque converter
  • Estimated Cost to Fix: $500 - $1,000+
• Shift solenoid failure: Malfunctioning shift solenoids, leading to transmission slipping, delayed or harsh shifts, and other shift-related issues.
  • Solution: Replacement of the shift solenoids
  • Estimated Cost to Fix: $200 - $400+

NV4500 5-Speed Manual

• Clutch failure: Worn or damaged clutch disc or pressure plate, causing difficulty shifting, slippage, or chatter.
  • Solution: Replacement of the clutch
  • Estimated Cost to Fix: $400 - $800+
• Synchronizer failure: Worn or damaged synchronizers, resulting in grinding or difficulty shifting gears.
  • Solution: Replacement of the affected synchronizers
  • Estimated Cost to Fix: $200 - $600+

Suspension

• Front suspension coil spring failure: Broken or collapsed coil springs in the front suspension, leading to reduced ride height and handling issues.
  • Solution: Replacement of the coil springs
  • Estimated Cost to Fix: $200 - $400+
• Rear leaf spring breakage: Fatigue or overloading can cause the leaf springs in the rear suspension to break, leading to reduced load capacity and handling problems.
  • Solution: Replacement of the broken leaf springs
  • Estimated Cost to Fix: $300 - $600+

Electrical

• Alternator failure: Malfunctioning alternator, resulting in insufficient charging of the battery and electrical system.
  • Solution: Replacement of the alternator
  • Estimated Cost to Fix: $200 - $400+
• Battery drain: Parasitic draw on the battery, causing it to discharge when the vehicle is turned off.
  • Solution: Identifying and eliminating the source of the battery drain
  • Estimated Cost to Fix: Varies depending on the source

Exterior

• Rust and corrosion: Some GMC R2500 Suburbans may experience rust and corrosion on the body panels, frame, and undercarriage.
  • Solution: Regular maintenance, rust prevention measures, and repairs as needed
  • Estimated Cost to Fix: Varies depending on the extent of the damage

Interior

• HVAC system issues: Malfunctioning HVAC controls, blower motor, or condenser, leading to problems with heating, cooling, or ventilation in the cabin.
  • Solution: Repair or replacement of the affected components
  • Estimated Cost to Fix: $100 - $600+
• Dashboard cracking: Cracks or warping of the dashboard due to sun exposure or age.
  • Solution: Replacement of the dashboard
  • Estimated Cost to Fix: $500 - $800+

Recalls

• NHTSA Campaign Number: 92E010000
  • Issue: Fuel pump relay contacts may weld together
• NHTSA Campaign Number: 90V079000
  • Issue: Front brake hoses may leak
• NHTSA Campaign Number: 89V218000
  • Issue: Speedometer may fluctuate or fail

Summary The 1990 GMC R2500 Suburban is a capable and durable vehicle, but it is not without its issues. The most common problems reported by owners include engine intake manifold gasket failure, throttle position sensor failure, excessive oil consumption in 7.4L V8 engines, torque converter shudder in the 4L80E transmission, and suspension component failures.

The severity and cost of the issues can vary depending on the specific problem, the extent of the damage, and the cost of parts and labor in your area. It’s important to address any issues promptly to prevent further damage and ensure the safety and reliability of your vehicle.