Tech Tip: MIL Illuminated, System Lean in Ford/Lincoln/Mercury Vehicles
This article is intended to aid in diagnosing DTCs P0171, P0174, P1130, P1131, P1150, P1151, P2195 or P2197 (system lean or lack of HEGO switches) when a vacuum leak is present. HEGO sensors, MAF sensors and PCM replacements are not an effective repair when a vacuum leak is causing the above DTCs.
Flashing Signals / Reprogramming PCMs
You don’t have to be Microsoft A+ certified to flash reprogram automotive PCMs, but the process requires a certain amount of know-how as well as special tools and access to the latest OEM software upgrades (which are not free!). What’s more, it’s not a risk-free endeavor. Certain precautions must be undertaken before you begin, and
When Should You Replace an Oxygen Sensor?
Is there a mileage or time requirement for oxygen sensor replacement? Simple answer: No. Oxygen sensors were first used for fuel trim and emissions in the late 1970s and into the mid 1990s. A single sensor was installed into the exhaust stream to modify fuel delivery and maintain catalytic converter efficiency. Beginning January 1, 1996,
Engine Tech Tip: Measuring Blowby
You’ve built an engine exactly the same as the last engine, but the power seems to be down 10 to 20 horsepower on the dyno. Could it be excessive blowby because of a ring sealing problem? One way to find out is to measure crankcase blowby.
TDI Driveability: Carbon Plugging of the Intake System
Volkwagen has been selling diesel-powered cars in the U.S. for almost 30 years. Turbocharged versions have been available for 25. That is a lot of experience and a testament to the development of a reliable, efficient and durable powerplant. The introduction and development of the TDI (turbocharged direct injection) brought the VW diesel into the
Tech Tip: MIL Illuminated, System Lean in Ford/Lincoln/Mercury Vehicles
This article is intended to aid in diagnosing DTCs P0171, P0174, P1130, P1131, P1150, P1151, P2195 or P2197 (system lean or lack of HEGO switches) when a vacuum leak is present. HEGO sensors, MAF sensors and PCM replacements are not an effective repair when a vacuum leak is causing the above DTCs.
Diagnostic Oddities
This article is dedicated to some Ford specific issues that, after being brought to light, can save your shop thousands of dollars in wasted time and liability. There may be some other makes out there with some similar designs and quirks, but the only technical references will be for Ford vehicles. By Glen Beanard Giddy
Codes & Converters
It is a moral dilemma that many shops encounter on a regular basis. It starts when a good customer comes in with the engine light a blaze. Running your usual diagnostics, you encounter a catalytic converter efficiency code, slow to responded oxygen sensor or some proprietary fuel trim code. Other than the light, the customer
Diagnostic Dilemmas: Internal Engine Diagnostics
The nuts and bolts of measuring cylinder leakage In OBD II diagnostics, most of us know that an external component like a faulty fuel injector, ignition coil, spark plug or spark plug wire is usually responsible for a P0300-series cylinder misfire trouble code. Nevertheless, even with more sophisticated onboard diagnostic strategies, the PCM usually can’t
Olds Engines: Gone But Not Forgotten
By Larry Carley Times change and vehicle makes and nameplates come and go. The last official Oldsmobile rolled off the assembly line on April 29, 2004, when General Motors pulled the plug to stop the hemorrhage of red ink in their ailing Oldsmobile car division. Though the brand is now history, there are still millions