Grand Wagoneer 1990
Service Manual

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Grand Wagoneer 1990

GENERAL INFORMATION
SPECIFICATION
PERIODIC INSPECTION AND ADJUSTMENT
ENGINE
OVERHAUL
COOLING SYSTEM
FUEL SYSTEM
CHASSIS
ELECTRICAL SYSTEM
BODY
TIRES
WHEELS

PLUS MUCH MORE

FORMAT: PDF
LANGUAGE: English
COMPATIBLE: Win / Mac / Linux

Average maintenance and replacement items for a 140k+ mile vehicle notwithstanding, it's quite solid. The AMC 360 V8 still holds 40 pounds of oil pressure hot, the bulletproof Chrysler 727 tranny shifts like a charm, and the NP229 transfer case works flawlessly. The two main origins of problems with the truck crop up when the Ford-sourced parts, the carb and ignition, decide to go south. The stock Motorcraft 2150 carb can be temperamental to tune, and has a mixed reputation for reliability. A small backfire usually will kill the power valve, requiring a minor, but still inconvenient replacing. Its layout is a tad complex , and the linkages need to be kept adjusted and lubed to avoid problems.

As carbs go, I've found it to be mediocre at best, as compared to other comparably-sized units, such as the Holley 2300. At 125k, I replaced the worn stock 2150 with a remanufactured unit, and will probably be switching to GM throttle body injection by the end of the spring, in the hopes of pulling more efficiency out of the induction setup. The key is getting it setup and tuned correctly; if you can do that, and keep it that way, you'll be set. (It can be done.) Keeping a spare zip tied to the mounted one is good insurance against being stranded. Should one fail, you just switch two connectors, and you're on the road again.

1990 Grand Wagoneer

Grand Wagoneer 1990

Other than that, most everything else I've replaced was just a function of normal wear, rather than poor design or build quality. The alternator has been replaced, after the stock unit went for 113k.The radiator was replaced after a seam wore out after 124k of service. The steering gear has developed a little bit of play, and a slight seal leak, and is due for replacing, but it's in line after almost 150k.The fuel gauge sender unit works, but is afflicted by the typical resistor deterioration woes inherent in the ancient AMC design, and can read a little low below a half tank. It's easily remedied though, with a $40 replacement. Thankfully, the tank access plate in the rear floor makes replacing possible without dropping the tank. Other than that, two or three minor electrical glitches spawning from either component wear, age, or mild corrosion have been easily fixed with little cost or effort. The rear window can be temperamental, but works well after being serviced properly.

The 1990 Grand Wagoneer is simply the finest vehicle I've ever owned. It's got ample power, plush comfort, unmistakable styling, and is extremely accessible to work on. I have found nothing that handles better in snow, and the 360 makes highway driving fun Those who see past the typical gremlins that can come with older cars make up quite the craze following for these trucks, with a camaraderie among enthusiasts.