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Tech Feature: Detecting Misfires in OBD II Engines

With OBD II, there’s no missing misfires. Most engine control systems with OBD II monitor the speed of the crankshaft between cylinder firings to detect misfires. The powertrain control module (PCM) notes the relative position of the crankshaft via the crankshaft position sensor (CKP) each time a trigger pulse is sent to the ignition system.

Catalytic Converter Tech Feature: Diagnosing P0420 or P0430 DTCs

Although modern OBD II technology has simplified catalytic converter diagnostics, it’s still important to understand the basics of catalytic converter operation when dealing with a P0420 or P0430 DTC. Gary Goms explores the basics of catalytic converter chemistry and summarizes how common converter failures can be diagnosed.

Tool Feature: Scan Tools and Software Updates

Though some vehicles have diagnostic modes that can show fault codes and other diagnostic information via the instrument panel, climate control system or driver information display, most simply turn on the check engine light or another warning light when a problem occurs. So without a scan tool, there’s no way to tell what the problem might be, let alone make an accurate diagnosis of which sensor or other component may need to be replaced.

Tech Tip: Hyundai Check Engine Light Diagnostics

There are a couple of ways a Hyundai will find its way into your bay with a check engine light complaint. If a misfire is obvious, you may be tempted to get to work and start switching coils, checking wires or whatever, looking to diagnose the problem. But before you do, check the codes to see if more information is available.

Tech Tip: Multiple Cylinder Misfire or Rough Idle on Chrysler Models

This bulletin involves rotating all engine exhaust valves, replacing the valve spring retainer locks with a new design to increase valve rotation at lower rpm, inspecting/replacing the MAP sensor (as necessary), and decarbonizing the combustion

Jeep Fuel Problems Needn’t Be an Uphill Battle

The Jeep Grand Cherokee has been a dependable vehicle for many vehicle owners over the years. However, the SUV has had a few fuel system problem that has put Jeeps in repair shops. In this article, we’ll address some fuel system complaints that have plagued these vehicles.

Tech Feature: Jeep Fuel Problems Needn’t Be an Uphill Battle

The Jeep Grand Cherokee has been a dependable vehicle for many vehicle owners over the years. However, the SUV has had a few fuel system problem that has put Jeeps in repair shops. In this article, we’ll address some fuel system complaints that have plagued these vehicles.

Tech Feature: Spark Plug Replacement is a ‘Big Deal’ in Today’s Market

While changing spark plugs used to be “no big deal,” today’s long-life spark plugs often require more extensive disassembly and more precise installation.

Porsche Engine Diagnostics: Misfire Codes, Fuel Trim Faults, Secondary Air Injection

Porsche has been building engines for decades that will literally fit in a suitcase, but are still able to put out horsepower that rivals many larger engines. Find out how to keep the Porsche Boxster engine running smoothly.

Tech Feature: Mazda Driveability Diagnostics and Check Engine Light Complaints

From a torn air intake hose to ignition system concerns, Bob Dowie tackles driveability issues as well as some of the more common ailments that will bring Mazda vehicles into your bays with a check engine lamp complaint.