Tech Tips

Firing on All Cylinders?

A running compression test is a great tool for diagnosing density misfires. A running compression test or dynamic compression test is an often overlooked engine diagnostic tool, but it can pinpoint the cause of a misfire when the usual tests are normal. When you perform a static compression or cylinder leak-down test, you’re checking the […]

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GM Security Systems

If you’ve worked on any GM vehicles over the past 20 years, most likely you have encountered one of their security systems. Passkey, one of GM’s most popular earlier systems, used a pellet in the steel shank of the key with wires routed through the steering column. Those wires often broke at the key cylinder […]

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Ford Hybrid A/C

Face it. Working on hybrid vehicles can make some technicians nervous. Even though the systems on a hybrid may be used somewhat differently, they are not new and most technicians will have no problem working on them. Recently I got a call on a 2008 Escape Hybrid with an A/C issue. So what is different […]

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Mitsubishi A/C Compressor Clutch

I took a hotline call the other day that reminded me of an odd problem on some Mitsubishi vehicles that I have seen many times now. Some of the vehicles involved are the Galant (1999 to 2004), Eclipse (2000 to 2011), Lancer (2002 to 2005) and the Outlander equipped with manual air conditioning system (2003 […]

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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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