Intermittent Engine Misfire Analysis
Even for an experienced diagnostic technician, attempting to diagnose an intermittent misfire condition that occurs only under specific driving conditions can be a frustrating exercise. Let’s begin by getting the basics out of the way. As we know, the general causes of a misfire fall under the general headings of 1.) ignition, 2.) fuel density, 3.) compression and 4.) timing failures.
Emissions Codes: Mercedes-Benz Case Study
If the MIL is on, or even commanded on, with no current code related to emissions, it can be cause for a failure. The vehicle will still be scanned for codes and readiness flags will be checked, but an MIL on with the engine running will almost always spell “failure.”
A Clean Fuel Tank Improves A Fuel Pump’s Diet
Fuel pump replacement comebacks can be costly and can hurt your reputation. One of the leading causes of failure is the tank. If a vehicle gets 20 miles to the gallon, then more than 5,000 gallons of gas (from many stations) will go through the tank in 100,000 miles. And during this time, sediment, rust
What’s in Your Tank?
Although cases involving contaminated gasoline are relatively rare nowadays, they still occur. In many cases, technicians have 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,
Under the Hood: ‘Tanking’ Fuel Systems
Diagnosing Failing Fuel Pumps
Component Connection: Filter Replacement — Containing the Contaminants
Although air and fuel filter maintenance is usually considered a “no-brainer” by most automotive repair shops, advancing OE technology is changing the way you should be performing air and fuel filter maintenance.
Volkswagen and Audi Diagnostics
AVI can finally help any shop profitably diagnose and repair VW’s and Audi’s with this long awaited training program with ATG instructor Ross Wellwood.
Quick Check Diagnostics
Whether you want to pass the A4 ASE test or you work on steering/suspension systems in your shop, you won’t want to miss this training program.
Engine Series: A Decade of the Duratec 30
The 3.0L Duratec V6 was introduced in 1996 to replace the aging 3.8L V6 in the Ford Taurus and Mercury Sable. Unlike its conventional pushrod predecessor, the 3.0L V6 has dual overhead cams, four valves per cylinder and an aluminum block with cast-iron cylinder liners.
Engine Series: Thinking ‘Inside the Box’
Service Notes on Subaru’s Boxer Engine