![]() ![]() In years past, I’ve had product problems like a brand-name timing chain set coming out of its box with the timing marks incorrectly drilled into the cam sprocket and a new camshaft with the sprocket locating pin drilled in the wrong position. When dealing with a new engine that won’t start, it’s important to “baseline” all of the essential functions. I assumed that there was more to this problem than meets the eye, and accepted the assignment from my client shop. To his dismay, he found that, although he installed the engine “according to the book,” it would crank, but not start. The owner had just installed a 4.0L engine modified by a very reputable local engine rebuilder. The fuel-injected 4.0L is also ideal for traversing high mountain trails because it compensates for major changes in altitude and doesn’t starve for fuel or flood out on steep inclines.Īs with many other cases, this month’s “Diagnostic Dilemma” was referred to me by a client shop. The cylinder head also can be modified to increase compression and breathing for high-altitude off-roading. Stroker kits also are available to increase the displacement of the 4.0L. Many enthusiasts install lift kits, air-locking differentials, winches, skid plates, higher numerical ratio axle gears and other off-road paraphernalia. I’ve been getting a number of diagnostic cases on ’90s Wranglers because, with a minimum of on-board electronics, they’re very adaptable for off-roading. Of course, a vehicle of this vintage and configuration has to be about as basic as modern technology can get, right? Well, there are always exceptions. This month’s happened to be a 1992 Jeep Wrangler equipped with the 4.0L engine and manual transmission. ![]()
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