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Diagnostic Dilemma: The Case of the Missing Code

When doing mobile diagnostic work, no-code stalling complaints are a major part of your agenda. In most cases, the client shop is simply too busy to duplicate the failure or, in some cases, a long test drive will yield nothing in the way of useful...

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Secondary Ignition: The Art of Spark

What is a coil? From the beginning of the internal combustion engine, several different ignition systems have been used to create a high-energy spark. The most popular system, and the one that’s in use today, is a step-up coil. A coil is nothing...

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Diagnosing Catalytic Converter Failure Symptoms

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Electronic Proportioning Valve: Doing More With Less Hardware

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NHTSA’s GM Brake Line Corrosion Investigation: Reading Between the Brake Lines

There will be no recalls on some GM vehicles for brake line corrosion. Instead, we received an advisory from the National Highway and Traffic Safety Administration (NHTSA) about brake line inspection and car washes. What was not discussed was the corrosion...

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2007-2011 Ford Expedition and Navigator Air Suspension

The Ford Expedition air suspension does more than just lift and raise the vehicle. The system levels the vehicle under loads and when a trailer is attached. The system uses only two air bags on the rear axle unlike previous models with air bags on all...

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MAZDA: Timing Belt & Chain Replacement

This month, we’re going to be looking at the ­timing components on the Mazda line of vehicles. We’ll be focusing on timing belts since they are considered a service item and will present the greater amount of opportunity for replacement. Then, we’ll...

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Honda Element Brake Job

It may look like a car that was never removed from the box it came in, but the Honda Element isn’t boxy when it comes to the brakes. Based on the CR-V platform, there is also nothing tricky when it comes to service. But, its brake system is hardware...

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The Changing Maintenance Market: New Technologies Mean More Opportunities

Most of us wake up each morning, not ­realizing that our professional world has changed even as we slept. Our first job of the day is to service a ­vehicle equipped with an oil life monitor. Not only do we discover that modern oil life monitors can...

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Converter Codes: How Long Will the Light Stay Out?

OBDII systems with faulty catalytic converters will normally store a diagnostic trouble code (DTC) when the converter begins to fail. The OBDII converters use an upstream and downstream oxygen sensor to measure the differences in oxygen content between...

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Maintaining Your Spray Guns

If there’s one piece of equipment that epitomizes the painter and the paint shop, it’s the spray gun. Over the years we’ve seen many spray guns. Although there are operating principles and functions that remain the same, some have been improved...

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Wheel Bearing Adjustment Tools & Equipment

A recent survey showed that more than half of the bearings on the road today are adjusted incorrectly. A wheel bearing that’s out of adjustment can reduce bearing life and can affect more than just the bearing. An out-of-adjustment bearing affects...

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Applications
Ford: 1990-1994 Tempo, 1990-1997 Escort, Probe, Thunderbird, 1990-1998 Mustang, 1990-1999 Taurus, 1990-2002 Crown Victoria, 1997-1999 Contour, 2001 Taurus, 1990 Bronco II, 1990-1996 Bronco, 1990-1997 Aerostar, F Super Duty, F-250 HD, F-350, 1990-1999 F-250 Ltd, 1990-2002 Econoline, F-150, Ranger 1991-2002 Explorer, 1995-2002 Windstar, 1997-2003 Expedition, 1999-2002 Super Duty F Series, 2000-2002 Excursion, Explorer Sport Trac, Explorer Sport, 2001-2002 Escape.

Lincoln: 1990-1992 Mark VII, 1990-1994 Continental, 1990-2002 Town Car, 1998-2003 Navigator, 2002 Blackwood.

Mercury: 1990-1994 Topaz, 1990-1997 Cougar, 1990-1999 Sable, 1990-2002 Grand Marquis, 1991-1997 Tracer, 1997-1999 Mystique, 2001 Sable, 1993-2002 Villager, 1997-2002 Mountaineer.

Problem
After replacing the alternator, a hum, whine or buzzing noise is heard through the speakers of the vehicle radio or two-way radio when the fuel pump runs.

Cause
The in-tank electric fuel pump may be the cause of the electrical noise. In August of 2002, Ford Motor issued TSB 02-16-4 addressing this issue.

Solution
The following procedure will help determine if the fuel pump is the cause of the radio noise (refer to TSB 02-16-4 for complete details):

1. Turn the ignition key to the "Accessory" position (not Start).

2. Turn on your radio.

3. Now turn the ignition key to the "Run" position (do not start the engine).

4. Let the fuel pump run about one second with the key in the "Run" position (engine off).

5. Listen for noise in the radio. If noise is present while the pump is running and stops when the pump stops, then the fuel pump is generating the noise.

Note: If the radio noise is fairly constant, or varies with the vehicle speed, this fix does not apply.

Notes
TSB 02-16-4: Installation of the electronic noise Radio Frequency Interference (RFI) Filter (F1PZ-18B925-A) on the fuel pump inside the fuel tank requires a bundling strap (95873-S101) and heat-shrink tubing (F5AZ-14A099-AA). This is repair should be done by a service professional.

Warning: If your vehicle has an electronic return-less fuel system, do not install a RFI filter inline on the fuel pump. Only vehicles with mechanical return-less fuel systems (pressure regulator in the tank), or systems with the pressure regulator on the fuel rail should be approved for the RFI filter installation. Some light trucks require one (1) RFI filter for each in-tank electric fuel pump on multi-tank vehicles. This instruction does not include 1999 Taurus or Ranger flexible fuel vehicles.

Note: This bulletin is supplied as technical information only and is not an authorization for repair.

Tech Tip courtesy of CARDONE.

For additional information on products offered by CARDONE, visit www.cardone.com.

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