fuel system Archives - Page 14 of 16 - TechShop Magazine
Diagnostic Dilemmas: Servicing Jeep and Ford Feedback Carburetors

Lately, it seems, more people are “going retro” by rehabilitating older cars and trucks. Perhaps it’s the longing for the simplicity of a bygone era or perhaps it’s the sentimental attachment to a particular vehicle that’s driving the retro movement. Although in the Rustbelt East, the survival rate of these vehicles is probably very low,

Under Pressure: Piston Service For Light Truck Diesels

The diesel engine market has been rapidly changing in recent years. Higher fuel prices and changes in emission regulations have brought about a whole new generation of clean diesel engines in both the light- and heavy-duty truck markets. According to the Diesel Technology Forum (www.dieselforum.org), particulate emissions from new on-highway diesel engines have been reduced

You Can Tune a Carburetor, but You Can’t Tuna Fish

I don’t know where the term “master engine tuner” originated, but I suspect it parallels that of “master piano tuner” because both disciplines transform apparent discord into apparent harmony. In this day of electronically managed engines, we forget that mechanically controlled spark advance curves and carburetor mixtures don’t compensate for changes in barometric pressure and

Diagnostic Solutions: Air/Fuel Ratio Sensors

Diagnose and Solve the Root Cause of Sensor Failure Before Sensor Replacement

Hose & Reels: Reeling It In

It is said that a chain is only as strong as its weakest link. This idea applies to many things in life. Air tools and equipment are no exception. Today’s pneumatic equipment is far superior in many ways to equipment made just a few years ago. There are lighter materials and better designs, resulting in

Cleaning Carbon from TDI Intake Systems

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

Diagnostic Dilemmas: Servicing Quadrajet Carburetors

src=”/wp-content/uploads/Articles/05_01_2008/39766Carb4jpg_00000021239.jpg” border=”0″ ” align=”right” alt=”photo 4: float level can easily be measured on the quadrajet.”/>can be measured by inserting a special Kent-Moore float level gauge into the bowl vent located just aft the choke valve. See Photo 4. Measuring the distance from the top of the bowl vent to the float and then subtracting the

Subaru Tech Tip: Diagnosing Idle Surges on Legacy Models

If you encounter a driveability concern such as idle surges or whistling, it may be caused by carbon buildup on the Idle Speed Control (ISC) valve. In these cases, it is not necessary to replace the ISC valve. Cleaning the ISC valve could correct the condition. To clean an ISC valve, perform the repair procedure ….

Fuel Injector Service: The Basics and Beyond

and go traffic conditions. Because high underhood heat usually increases electrical and clogging failures in fuel injectors, fuel-injected vehicles driven in metro areas may generally need more maintenance than vehicles driven in rural areas. We can also generally say that many late 1980s and early 1990s fuel injectors fail more often because of poor design,

Carburetor Tuning Through the Years

The modern “square” design of Holley carburetors was popularly introduced during the late 1950s. Because this style of Holley carburetor featured a simple, modular design with interchangeable parts and a great degree of adjustability, it immediately found favor with performance enthusiasts. In this story, we’ll use the Holley 4150-series carburetors to illustrate how to select,

Carley’s Corner: Fuel Pump Warranty Returns Still an Issue

About a year ago, I attended a meeting of the Fuel Pump Manufacturers Council (FPMC) in Chicago. The members of FPMC are the companies who manufacture and supply fuel pumps to the aftermarket (as well as the auto makers). The purpose of the meeting was to address a serious problem that has been plaguing the

Is There Enough Pressure? Fuel Injection Diagnosis & Service

One of the first questions that should always be asked — and answered — when diagnosing a fuel-related complaint on a fuel injected engine is, “What is the fuel pressure?” All too often, technicians assume fuel pressure is “good” without actually measuring it with a gauge. If the engine runs, they assume the injectors are