Fuel pump isn’t buzzing 2002 Chevy Tahoe

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May 232017
 

Chevy TahoeJust put a fuel pump on 2002 Tahoe. The fuel pump was working when I first put it on but still wouldn’t crank. Now the dash board has went out. Attempting to get started now. When I turn the key, the only thing it shows is a check engine light. But the gauges won’t move, the message board doesn’t light up and the fuel pump isn’t buzzing any more. I need help I’m out of answers


Fuel pump isn’t buzzing

First thing to do would be to make certain the battery is fully charged. A weak battery can lead to confusion during diagnostics from false readings. So, charge the battery or replace it with one that is fully charged before continuing with your diagnostics.

May 192017
 

Chevy TrailblazerEngine surges under medium acceleration, no mil light. Bad distributor gear?


Surges under medium acceleration

My thought would be more fuel related. Remove the air filter and test. If you see a change then you know it is fuel related. Concentrate on that area. Replace fuel filter, air filter and move to high octane at a different station at the next fill up.

May 112017
 

Chevy SuburbanTransmission Went Out

I upgraded from 28.9 in tire to 32.4 in tires. a week later transmission went out, what should I change to relieve strain on trans
I upgraded from 28.9 in tire to 32.4 in tires. a week later transmission went out (band went out). Had it rebuilt and then 3 weeks later it over heats and burns up 2nd, 3rd, and 4th gear (transmission shop said they don’t know why it over heated, I think there was a leak though). Are the larger tires directly related to my transmission issues and if so, should I re-gear the rear end to take stress off the tranny or upgrade the torque converter? Truck is currently stock with L60e transmission. 2wd. I have noticed that i lost quite a bit of acceleration on take off, like im riding the brakes. truck almost struggles to take off. So I’m not sure if the tires alone will make that big of a difference or if something else is wrong too. Stock rims 15 in alloy with 28.9 in tires, new rims 20 in with 32.4 in tires. the width on the new tires is more too, can’t remember how much though. My car has 278000 miles. My car has an automatic transmission.


Tire size is not the cause of the transmission issue. Overheating the transmission is the cause. You may need to check your factory fan shroud. Check the cooling fan. You may need to replace or install a cooling fan.

Replacing the rear differential gears would give you a quicker tack off if you wanted to stick with the bigger tires.

May 052017
 

2005 Chevy ClassicI have some serious instrument cluster problems. All cluster lights come on at one time and cause the gas gauge to go to zero and the cruise controls stops working.


Instrument Cluster Problems

In reviewing what causes some of what is going on here I have come up with 3 things.

  1. Malfunction in the fuel level sensor circuit
  2. Lack of communication with PCM
  3. Lack of communication with BCM

Review the tests and information below to help diagnose your instrument cluster problems.

Instrument Panel Cluster (IPC)

Your instrument panel cluster is designed to let you know at a glance how your vehicle is running. You’ll know how fast you’re going, how much fuel you’re using, and many other things you will need to drive safely and economically.

Your vehicle has this instrument panel cluster, which includes indicator warning lights and gauges that are explained on the following pages.

Instrument Cluster Description and Operation

Instrument Cluster Problems Displays Test

Certain instrument panel cluster (IPC) features are tested when the ignition is turned on in order to verify the features are working properly. The following indicators illuminate briefly at key up unless otherwise noted:

  • ABS
  • Air bag – flashes 7 times
  • Brake system
  • Charging system
  • Check oil
  • Door ajar
  • Engine coolant temperature
  • Fasten safety belt
  • A Low engine coolant level
  • Low fuel
  • Low washer fluid
  • Malfunction Indicator Lamp (MIL)
  • Service vehicle soon
  • Theft system
Engine Coolant Temperature Gauge

An IPC displays the engine coolant temperature as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the engine coolant temperature. The BCM converts the engine coolant temperature into a percent gauge deflection. An IPC receives a message from the BCM via the serial peripheral interface (SPI) indicating the requested gauge position. The engine coolant temperature gauge defaults to 38°C (100°F) or below if:

  • A PCM detects a malfunction in the engine coolant temperature sensor circuit.
  • The BCM detects a loss of class 2 communications with the PCM.
  • An IPC detects a loss of SPI communications with the BCM.
Fuel Gauge

An IPC displays the fuel level as determined by the PCM. The body control module (BCM) receives a class 2 message from the PCM indicating the fuel level percent. The BCM converts the fuel level percent into a percent gauge deflection. An IPC receives a message from the BCM via the serial peripheral interface (SPI) indicating the requested gauge position. The fuel gauge defaults to E (empty) if:

  • A PCM detects a malfunction in the fuel level sensor circuit.
  • The BCM detects a loss of class 2 communications with the PCM.
  • An IPC detects a loss of SPI communications with the BCM.
When the fuel level is less than a pre-determined value, the low fuel indicator illuminates.
Odometer

The IPC contains a season odometer and a trip odometer. Momentarily press the trip/reset switch on the IPC in order to toggle between the season odometer and the trip odometer. In order to reset the trip odometer, press the trip/reset switch for greater than 2 seconds. The IPC calculates the mileage based on the vehicle speed signal circuit from the PCM. The odometer will display ‘error’ if an internal IPC memory failure is detected.

Speedometer

An IPC displays the vehicle speed based on the information from the PCM. The PCM converts the data from the vehicle speed sensor to a 4000 pulses/mile signal. An IPC uses the vehicle speed signal circuit of 4000 pulses/mile from the PCM in order to calculate the vehicle speed. The speedometer defaults to 0 km/h (0 mph) if a malfunction in the vehicle speed signal circuit of 4000 pulses/mile exists or if the BCM sends or receives invalid data with the IPC via serial peripheral interface (SPI).

Tachometer

An IPC displays the engine speed based on information from the PCM. The PCM converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. An IPC uses the engine speed signal circuit of 2 pulses/engine revolution from the PCM in order to calculate the engine speed. The tachometer defaults to 0 rpm if a malfunction in the engine speed signal circuit of 2 pulses/engine revolution exists or if the BCM sends or receives invalid data with the IPC via serial peripheral interface (SPI).

Instrument Cluster Programming and Setup

This device requires no programming or setup.

 

Apr 252017
 

2004 Chevy AvalancheI just changed my brakes. When I started it up, when I was done, I got a service brakes message. What should I do?


You may want to check you brake fluid level first before clearing the message. Make sure the level is above the minimum level.

Service Brakes Message

service brakes message

If a problem occurs with the brake system, this message will appear on the DIC. If this message appears, stop as soon as possible and turn off the vehicle. Restart the vehicle and check for the message on the DIC display. If the message is still displayed, or appears again when you begin driving, the brake system needs service. Pressing the select button will acknowledge this message and clear it from the DIC display.

Apr 242017
 

2000 Chevy Metro

Alternator Replacement

Trying to replace alternator. It is lose but can’t come out the top and CV-joint in the way so cant come out the bottom. Help please?


You will need to remove the air cleaner assembly in order to remove the alternator from the top.

alternator replacement 2000 Chevy Metro

Alternator Replacement 2000 Chevy Metro

Removal
  • Disconnect the Negative battery cable.
  • Remove the air cleaner assembly.
  • Remove the rubber insulator, the nut, and the electrical connector from the alternator B+ terminal.
  • Take off the upper mounting bolt (1).
  • Remove the drive belt.
  • Remove the 2 lower alternator mounting bolts (2).
  • Take out the alternator.
Installation
  • Install the alternator to the vehicle.
  • Install the lower mounting bolts (2). Do not tighten the bolts at this time.
  • Install the upper mounting bolt (1). Do not tighten the bolt at this time.
  • Install the drive belt to the pulleys.
  • Adjust the drive belt in order to obtain the specified deflection with 10 kg (22 lb) of pressure exerted.
    Used Belt Deflection
    6-8 mm (0.24-0.31 in)
    New Belt Deflection
    5-7 mm (0.20-0.27 in)
  • Tighten the alternator mounting bolts.
    Caution!
    Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.Tighten
    Tighten the alternator bolts to 23 N·m (17 lb ft).
  • Connect the electrical connector to the alternator B+ terminal. Secure the connector with the nut and with the rubber insulator.Tighten
    Tighten the electrical connector nut to 8 N·m (71 lb in).
  • Install the air cleaner assembly.
  • Connect the negative battery cable.Tighten
    Tighten the negative battery cable to 15 N·m (11 lb in).
Apr 192017
 

1999 Chevy Camaro Z28Body control module issue

Started the car ran for 30 seconds turned off. Did this three times. Hit where the module is located security light went to a solid state nothing happened turning key. Hit again no security light nothing happened when turning key. If I replace the module do I need a reprogram or will it program itself to the key? A lot of forums said no programming but i want to make sure first.


Body Control Module (BCM) Programming/RPO Configuration

Programming A New Body Control Module (BCM)

Important Any new body control module (BCM) will automatically program to the resistance of the key (or interrogator setting) being used at the first ignition ON cycle. This can only be done once for the life of the module.
A new BCM is not programmed. Before the system will function properly it must be programmed to the code that matches the customer’s keys.

  • Install the new BCM.
  • Insert one of the customer’s keys into the ignition cylinder and turn it to the on position.
    Its good to start the engine at this time to verify system operation.
  • Observe the SECURITY indicator lamp for the following:

– The indicator lamp lights for approximately 5 seconds and then goes out. This indicates that the BCM is programmed properly.
– The indicator lamp flashes at a rate of one flash per second until the ignition is off. This indicates that the BCM did not program and the system components, wiring and contacts should be checked for a fault.

Apr 182017
 

2001 Chevy CavilierCar died while driving. Ive replaced the starter, the spark plugs, the ignition module. Still nothing. The fuel pump is kicking on. But car wont start.


Car died while driving

This kind of problem can be difficult to diagnose without knowing the correct steps to take. So I have taken the time to create a no start diagnostic chart. This will assist you in diagnosing the car died while driving issue.

Just follow the steps on the chart and they will help narrow down the cause.

 

Apr 112017
 

Chevy ColoradoI been having a issue with the right rear brake locking-up. I had to keep backing off the adjuster. Finally did a 4 wheel brake job. While doing so I did get air into the system, so bleed the system 3 times. Now with the key off I have a good pedal, when I turn the key on + press the pedal it goes to the floor. What is up with that?


RESPONSE

Hydraulic Brake System Bleeding (Pressure)

Tools Required

  • J 29532 Diaphragm Pressure Bleeder, or equivalent
  • J 35589-A Brake Pressure Bleeder Adapter

Caution! When adding fluid to the brake master cylinder reservoir, use only Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container. The use of any type of fluid other than the recommended type of brake fluid, may cause contamination which could result in damage to the internal rubber seals and/or rubber linings of hydraulic brake system components.
•Place a clean shop cloth beneath the brake master cylinder to prevent brake fluid spills.
•With the ignition OFF and the brakes cool, apply the brakes 3-5 times, or until the brake pedal effort increases significantly, in order to deplete the brake booster power reserve.
•If you have performed a brake master cylinder bench bleeding on this vehicle, or if you disconnected the brake pipes from the master cylinder, you must perform the following steps:
3.1. Ensure that the brake master cylinder reservoir is full to the maximum-fill level. If necessary add Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.

If removal of the reservoir cap and diaphragm is necessary, clean the outside of the reservoir on and around the cap prior to removal.
3.2. With the rear brake pipe installed securely to the master cylinder, loosen and separate the front brake pipe from the front port of the brake master cylinder.
3.3. Allow a small amount of brake fluid to gravity bleed from the open port of the master cylinder.
3.4. Reconnect the brake pipe to the master cylinder port and tighten securely.
3.5. Have an assistant slowly depress the brake pedal fully and maintain steady pressure on the pedal.
3.6. Loosen the same brake pipe to purge air from the open port of the master cylinder.
3.7. Tighten the brake pipe, then have the assistant slowly release the brake pedal.
3.8. Wait 15 seconds, then repeat steps 3.3-3.7 until all air is purged from the same port of the master cylinder.
3.9. With the front brake pipe installed securely to the master cylinder, after all air has been purged from the front port of the master cylinder, loosen and separate the rear brake pipe from the master cylinder, then repeat steps 3.3-3.8.
3.10. After completing the final master cylinder port bleeding procedure, ensure that both of the brake pipe-to-master cylinder fittings are properly tightened.
•Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.

Clean the outside of the reservoir on and around the reservoir cap prior to removing the cap and diaphragm.
•Install the J 35589-A to the brake master cylinder reservoir.
•Check the brake fluid level in the J 29532 , or equivalent. Add Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container as necessary to bring the level to approximately the half-full point.
•Connect the J 29532 , or equivalent, to the J 35589-A .
•Charge the J 29532 , or equivalent, air tank to 175-205 kPa (25-30 psi).
•Open the J 29532 , or equivalent, fluid tank valve to allow pressurized brake fluid to enter the brake system.
•Wait approximately 30 seconds, then inspect the entire hydraulic brake system in order to ensure that there are no existing external brake fluid leaks.

Any brake fluid leaks identified require repair prior to completing this procedure.
•Install a proper box-end wrench onto the RIGHT REAR wheel hydraulic circuit bleeder valve.
•Install a transparent hose over the end of the bleeder valve.
•Submerge the open end of the transparent hose into a transparent container partially filled with Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
•Loosen the bleeder valve to purge air from the wheel hydraulic circuit. Allow fluid to flow until air bubbles stop flowing from the bleeder, then tighten the bleeder valve.
•With the right rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right rear hydraulic circuit, install a proper box-end wrench onto the LEFT REAR wheel hydraulic circuit bleeder valve.
•Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.
•With the left rear wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the left rear hydraulic circuit, install a proper box-end wrench onto the RIGHT FRONT wheel hydraulic circuit bleeder valve.
•Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.
•With the right front wheel hydraulic circuit bleeder valve tightened securely, after all air has been purged from the right front hydraulic circuit, install a proper box-end wrench onto the LEFT FRONT wheel hydraulic circuit bleeder valve.
•Install a transparent hose over the end of the bleeder valve, then repeat steps 13-14.
•After completing the final wheel hydraulic circuit bleeding procedure, ensure that each of the 4 wheel hydraulic circuit bleeder valves are properly tightened.
•Close the J 29532 , or equivalent, fluid tank valve, then disconnect the J 29532 , or equivalent, from the J 35589-A .
•Remove the J 35589-A from the brake master cylinder reservoir.
•Fill the brake master cylinder reservoir to the maximum-fill level with Delco Supreme 11®, GM P/N 12377967 (Canadian P/N 992667), or equivalent DOT-3 brake fluid from a clean, sealed brake fluid container.
•Slowly depress and release the brake pedal. Observe the feel of the brake pedal.
•If the brake pedal feels spongy perform the following steps:
26.1. Inspect the brake system for external leaks. Refer to Brake System External Leak Inspection .
26.2. Using a scan tool, perform the antilock brake system automated bleeding procedure to remove any air that may have been trapped in the brake pressure modulator valve (BPMV). Refer to Antilock Brake System Automated Bleed Procedure .
•Turn the ignition key ON, with the engine OFF. Check to see if the brake system warning lamp remains illuminated.

Important If the brake system warning lamp remains illuminated, DO NOT allow the vehicle to be driven until it is diagnosed and repaired.
•If the brake system warning lamp remains illuminated, refer to  Hydraulic Brakes