Archive | Tech Tips

How to Diagnose Hydro-Boost Brakes

The following pertains to GM vehicles 1993 to present on ¾, 1 ton, C, K and G and on 2003 to 2007 Hummer H1 and H2. Hydro-boost brake system entered the market in the early 1970s for several good reasons. Diesel trucks using vacuum pumps to operate a vacuum booster worked OK for their time, […]

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Intermittent Dodge Ram 1500

I received a call on a 2003 Dodge Ram 1500 with an intermittent P0339 code for crankshaft position (CKP) sensor signal. Talking with the technician, I found out another shop had replaced the engine. The customer said it had never run right after that and kept setting the CKP sensor code. The tech had replaced […]

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Chrysler ZF 8HP Service Slants

A different kind of transmission requires a different type of service. If you are used to working on high-end import vehicles such as BMW, Audi, Bentley, Jaguar or Rolls-Royce, you’ve no doubt come across a version of the ZF Friedrichshafen AG-engineered 8HP transmission. However, for us Chrysler guys, this transmission is all new. Available in […]

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My 5.2 Diesel Does Not Start

A common complaint on the 5.2 Diesel is: “After sitting overnight, the engine does not start unless I pump the primer or spray some WD-40 at it.” While a number of issues can be present, one of the more common failures is a leak in the low side fuel supply to the fuel injector pump. […]

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No Crank Without Brake Switch

Starting in 2007 with the Altima, Nissan incorporated an Intelligent Key system with a push button ignition switch. The Intelligent Key (key fob) just needs to be near or inside the vehicle for the doors to unlock (by depressing a button on the driver’s door handle) and to start the engine (by depressing the push […]

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