1991 Gmc G1500 Problems & Reliability

If you’re a fan of classic vans or just someone who appreciates the rugged charm of early ’90s vehicles, the 1991 GMC G1500 might have caught your eye. This van, with its boxy design and utilitarian appeal, has been a staple for road trippers, DIY van lifers, and small business owners alike. However, like any vehicle that’s been around for a few decades, the G1500 has its share of quirks and issues. In this blog post, we’ll dive into some of the common problems owners have faced with the 1991 GMC G1500 and discuss its overall reliability. Whether you’re considering buying one or just curious about its performance, we’ve got you covered. While the 1991 GMC G1500 is known for its durability and spacious interior, it’s not without its challenges. From engine troubles to electrical gremlins, this van has kept many a mechanic busy over the years. But don’t let that scare you off just yet! Many owners swear by its reliability, especially when properly maintained. We’ll explore the most frequently reported issues, share some tips on how to keep your G1500 running smoothly, and weigh in on whether this classic van is worth the investment. So, buckle up and let’s take a closer look at what makes the 1991 GMC G1500 both a beloved classic and a bit of a fixer-upper.
Body Components

Parts Assessed:

Windows, power locks, manual locks, doors, trunk, tailgate, mirrors, power and manual seat controls, seat belts, sunroof, convertible top, glass defects.

Reported Problems:

N/A

Analysis:

No major problem has been reported

Parts Assessed

Brake pads, brake rotors, brake calipers, anti-lock braking system (ABS), brake lines, brake master cylinder, brake booster, parking brake, brake sensors, regenerative braking system (if applicable).

Reported Problems:

  • Leaking Water Pump May Cause Coolant Loss and Overheating

Analysis:

The 1991 GMC G1500 has a known issue with the water pump, which can lead to coolant loss and potential overheating. This problem can affect the overall reliability of the vehicle, as overheating can cause significant engine damage if not addressed promptly. It’s important for owners to keep an eye on coolant levels and address any leaks quickly to maintain the van’s performance.

Parts Assessed

Air conditioning compressor, AC condenser, AC evaporator, heater core, blower motor, automatic climate control system, refrigerant leaks, HVAC electrical components, temperature sensors, ventilation system.

Reported Problems:

  • Replace Fuel Filter Every 30,000 to Prevent Fuel Pump Failure

Analysis:

The 1991 GMC G1500 is generally a reliable vehicle, but one key maintenance tip is to replace the fuel filter every 30,000 miles to prevent fuel pump failure. This simple preventative measure can help avoid more significant issues down the road, ensuring the van runs smoothly. Regular maintenance like this is crucial for keeping an older vehicle like the G1500 in good shape.

Parts Assessed

CV joints, driveshaft, axles, differential, limited-slip differential (if applicable), traction control system, electronic stability control (ESC), four-wheel-drive (4WD) components, all-wheel-drive (AWD) components, transfer case, driveline vibration.

Reported Problems:

  • Flush brake fluid every 60,000 miles

Analysis:

The 1991 GMC G1500 is generally considered a reliable vehicle, but like any older model, it does have its quirks. One important maintenance tip is to flush the brake fluid every 60,000 miles to keep the braking system in good shape and avoid potential issues. Staying on top of this routine maintenance can help ensure the van continues to run smoothly and safely.

Parts Assessed

Infotainment system, GPS navigation, Bluetooth connectivity, touchscreen display, phone pairing, backup camera, rear entertainment system, head-up display, instrument cluster, digital gauges.

Reported Problems:

  • Intake Manifold Gaskets May Leak Coolant or Engine Oil

Analysis:

The 1991 GMC G1500 has a known issue with the intake manifold gaskets, which can lead to leaks of coolant or engine oil. This problem can affect the overall reliability of the vehicle, as it may cause engine performance issues or overheating if not addressed promptly. Regular maintenance and timely repairs can help mitigate these concerns and keep the van running smoothly.

Parts Assessed

Radiator, radiator hoses, cooling fan, water pump, thermostat, antifreeze leaks, engine coolant reservoir, overheating prevention system, intercooler (if applicable).

Reported Problems:

  • Internal Faults in Distributor Can Cause Engine Problems

Analysis:

The 1991 GMC G1500 has been known to experience engine problems due to internal faults in the distributor. This issue can lead to misfires and poor engine performance, which can be a headache for owners. While it’s a common problem for this model year, regular maintenance and timely repairs can help keep the van running smoothly.

Parts Assessed

Alternator, battery, ignition switch, ignition coil, spark plugs, ignition wires, engine control module (ECM), electronic ignition system, auto stop/start function, battery cables, engine wiring harness, fuse box, relays, starter motor.

Reported Problems:

  • Idling Problems Due to Vacuum Leak in Throttle Body Gasket

Analysis:

The 1991 GMC G1500 seems to have some reliability issues, particularly with idling problems caused by a vacuum leak in the throttle body gasket. This issue can lead to rough idling or stalling, which might be a bit of a headache if you’re relying on it for daily driving. While it’s a common problem for vehicles of this age, addressing it promptly can help maintain the van’s overall performance.

Parts Assessed

Engine rebuilds, cylinder head, head gasket, timing chain, timing belt, camshaft, crankshaft, connecting rods, turbocharger or supercharger (if applicable), valve train, piston rings, oil control system, engine knocking, engine misfires.

Reported Problems:

  • Alternator May Fail and Cause Noise and Dead Battery

Analysis:

The 1991 GMC G1500 seems to have some issues with the alternator, which can lead to annoying noises and a dead battery. This problem might leave you stranded if not addressed, so it’s something to keep an eye on if you’re driving or considering buying this model. Overall, while the van has its strengths, the alternator issue is a notable reliability concern.

Parts Assessed

Muffler, catalytic converter, exhaust manifold, heat shields, exhaust pipes, oxygen (O₂) sensors, resonator, exhaust leaks, emissions control system.

Reported Problems:

  • Distributor Shaft O-Ring Seal May Leak Oil

Analysis:

The 1991 GMC G1500 has a known issue with the distributor shaft O-ring seal, which can lead to oil leaks. While this problem might not be a deal-breaker, it’s something to keep an eye on if you own or are considering buying this van. Overall, addressing this issue promptly can help maintain the vehicle’s reliability.

Parts Assessed

Fuel pump, fuel injectors, fuel rail, fuel pressure regulator, throttle body, fuel gauge sensor, evaporative emissions system, EGR (exhaust gas recirculation) valve, charcoal canister, fuel filter, fuel tank, vapor leaks.

Reported Problems:

  • Service transmission every 30,000 miles

Analysis:

The 1991 GMC G1500 seems to have a pretty solid reputation when it comes to reliability, especially if you keep up with regular maintenance like servicing the transmission every 30,000 miles. This routine service helps prevent major issues and keeps the van running smoothly. Overall, as long as you stick to the maintenance schedule, the G1500 tends to hold up well over time.

Flagship-One-Engine-Computer-In-Stock
Onboard Electronics

Parts Assessed

Cruise control, keyless entry system, push-button start, wiper motor, warning lights, power mirrors, interior lighting, exterior lighting, dashboard indicators, electronic parking brake, tire pressure monitoring system (TPMS), alarm and security system, remote engine start, heated and ventilated seats, heated steering wheel, wireless charging pad.

Reported Problems:

  • Flush brake fluid every 60,000 miles

Analysis:

The 1991 GMC G1500 is generally considered a reliable vehicle, but like any older model, it does have its quirks. One important maintenance tip is to flush the brake fluid every 60,000 miles to keep the braking system in good shape and avoid potential issues. Staying on top of this routine maintenance can help ensure the van continues to run smoothly and safely.

Parts Assessed

Dashboard rattles, squeaks, wind noise, door seals, weather stripping, water leaks, air leaks, excessive road noise, suspension noise, drivetrain noise, exhaust rattles, engine bay noises.

Reported Problems:

  • Intake Manifold Gaskets May Leak Coolant or Engine Oil

Analysis:

The 1991 GMC G1500 has a known issue with the intake manifold gaskets, which can lead to leaks of coolant or engine oil. This problem can affect the overall reliability of the vehicle, as it may cause engine performance issues or overheating if not addressed promptly. Regular maintenance and timely repairs can help mitigate these concerns and keep the van running smoothly.

Parts Assessed

Paint durability, clear coat protection, rust prevention, corrosion resistance, body panel alignment, door seals, window trim, plastic trim, metal finishes, fading, cracking, peeling.

Reported Problems:

  • Replace Fuel Filter Every 30,000 to Prevent Fuel Pump Failure

Analysis:

No major problem has been reported

Parts Assessed

Struts, shocks, control arms, sway bars, ball joints, tie rods, wheel bearings, power steering pump, power steering fluid leaks, electronic power steering (EPS), steering rack and pinion, steering linkage, alignment issues, torsion bars, springs, air suspension (if applicable).

Reported Problems:

  • Leaking Water Pump May Cause Coolant Loss and Overheating

Analysis:

The 1991 GMC G1500 has a known issue with the water pump, which can lead to coolant loss and potential overheating. This problem can affect the overall reliability of the vehicle, as overheating can cause significant engine damage if not addressed promptly. It’s important for owners to keep an eye on coolant levels and address any leaks quickly to maintain the van’s performance.

Parts Assessed

Transmission rebuild, transmission replacement, torque converter, transmission solenoids, gear selector, gear shifting, transmission control module (TCM), transmission fluid leaks, clutch (manual transmission), automatic transmission valve body, CVT (continuously variable transmission) components, dual-clutch transmission (DCT) components.

Reported Problems:

  • Internal Faults in Distributor Can Cause Engine Problems

Analysis:

The 1991 GMC G1500 has been known to experience engine problems due to internal faults in the distributor. This issue can lead to misfires and poor engine performance, which can be a headache for owners. While it’s a common problem for this model year, regular maintenance and timely repairs can help keep the van running smoothly.

Conclusion

Facebook
Twitter
LinkedIn
Picture of Flagship One

Flagship One

The world's top supplier of programmed OEM (Original Equipment Manufacturer) Powertrain Control Modules (PCM), Engine Control Modules (ECM), Injection Control Modules (IDM), Body Control Modules (BCM), Transmission Control Modules (TCM), Engine Control Units and all other car control units. With over a decade in the business, we are the most reliable source when it comes to programming services for replacement engine control modules.

What Customers Think About Us