Not Sure That Air Filter Needs To Be Replaced? Check The Fuel Trim
The kicker with trying to diagnose whether an air filter is affecting performance is to see if the long-term or short-term fuel trims have changed.
Fuel System Diagnostics Is All In The Fuel Trim Numbers
With lean-burn operating strategies being built into many of today’s gasoline direct-injection and gasoline compression ignition engines, it’s important to build a foundational knowledge of how fuel trims work in the real world.
Electronic Throttle: Where’s The Cable?
Today, virtually every manufacturer has an electronic throttle system on board every make and model. That old throttle cable is a thing of the past.
Speed Density Systems Performance Reliability For Modern Engines
Modern engine technology is changing our Âconcept of how we increase engine torque and fuel economy.
Modern Fuel Control Diagnostics: Sorting Through The Data Stream Maze
Adapted from Gary Gom’s article in ImportCar. When confronted with a fuel control problem on a modern vehicle, I’ll normally use short- and long-term fuel trims to determine if the problem is caused by one of many failures, such as a vacuum leak or a leaking fuel pressure Âregulator. If you’re like me, you’ll
Plastic Intake Manifolds: Checking For Leaks
Most late-model engines come factory-equipped with plastic intake manifolds. Plastic saves weight and cost, and conducts heat much more slowly than aluminum or cast iron. This helps lower the temperature of the incoming air for a denser, more powerful air/fuel mixture.
Contaminated Fuel Can Wreck Havoc On Fuel Delivery Systems
Although cases involving contaminated gasoline are relatively rare nowadays, they still occur. In many cases, the technician has replaced the fuel pump or mass air flow (MAF) sensor to address a P0171/P0174 “lean-condition” DTC with no result. In all likelihood, the technician didn’t consider the possibility that the vehicle’s fuel might be contaminated with E85 gasoline, diesel fuel, stale gasoline, or, to a lesser degree, sugar and water.
The Case Of The Missing Code On A Chevy Tahoe
The Tahoe’s owner complained that it would stall at highway speed, but it would always restart and usually proceed without further incident until it reached home.
Top 10 Mercedes-Benz Repair Tips
With new vehicle sales topping 17.8 million units, and import nameplate VIO also on the rise, you’ll be seeing more imports that are in need of repair. And, with the increasing complexity and interconnectivity of vehicle systems, diagnostic expertise becomes all the more important. With that said, we bring you this collection of Mercedes-Benz repair tips to aid your service efforts.
The Best Tests For Fuel Delivery Systems
In this article, I’ll explain how the Âbasics of testing fuel delivery problems has changed and how some of the most common mistakes in diagnosing fuel Âdelivery systems can be avoided.
