Jun 152017
 

1994 Chevy Blazer

1994 Chevy Blazer 350 wont start

Okay I’ve been dealing with this for a few days and its really eating away at me. I’m sure I’m missing something small. But anyway, I have a 1994 Chevy Blazer, 4×4, 350, with 220k miles. I recently replaced my oil pressure sensor, control module and starter.

Okay, now she wont start. First thing I think the flywheel is worn down to much in one spot. Only in that spot the starter just spins. I have the shims on there but it still makes a god awful noise trying to start. While trying to start the throttle body is spiting out gas.

I did the old paper clip diagnostic and came out with a fuel pump relay low voltage. I also noticed the sending unit above the oil filter is not connected and I can find what connector goes on there the truck has spark I don’t have any gauges to check oil pressure I don’t know what to do.


Wont Start

It sounds like the check engine light code is sending you in the right direction. Try some starting fluid and see if she tries to fire up. If it does then you will want to check the fuel pressure. No fuel pressure would indicate a failure of one of the following:

  1. Fuel Pump Relay
  2. Fuel Pump Inline Fuse
  3. Wiring Harness
  4. Fuel Pump
  5. Leak In Fuel System
Jun 122017
 

1999 Chevy Camaro Z28

Evaporator core

I need to know how to r+r the ac evaporator core does it come out from inside the car or the outside? If outside do I need to pull engine?


No need to remove the engine or anything drastic like that since the evaporator core comes out from under the passenger side dash.

Evaporator Core Removal

  1. Disconnect the negative battery cable. Discharge the air conditioning system. Remove the right instrument panel sound insulator panel. Take the heater hoses off the heater core after the coolant has been drained. Open glove box. Push sides of glove box in and remove glove box. Remove heater core.
  2. Remove temperature control cable at temperature valve case. Take out the bolts, located in engine compartment, from temperature valve case. Slide temperature valve case down to disengage upper case clip and remove temperature valve case.
  3. Place a mat on the passenger floor to protect carpeting. Using a small hand saw, remove the perforated section of heater and A/C evaporator module as one piece (do not discard). Remove bolts and hoses retaining A/C evaporator. Slide evaporator to left. Remove evaporator from heater and A/C module.

Evaporator core removal diagram

To learn more or to get the complete replacement instructions feel free to grab your vehicle specific auto repair manual.

Jun 032017
 

 Chevy 25001997 Chevy 2500 5.7 hesitates from thirty miles a hour and up?


Could be a number of things. However if the check engine light is illuminated you will want to start there. Pull the check engine light codes and post them in the comments for further assistance with them.

7 possible causes for engine hesitation

  1. Contaminated fuel
  2. Ignition system issue
  3. Dirty air filter
  4. Clogged catalytic converter
  5. Clogged fuel filter
  6. Spark plugs worn
  7. Spark plug wires/coil over boot

Fuel pump isn’t buzzing 2002 Chevy Tahoe

 Auto Repair Questions, Chevy  Comments Off on Fuel pump isn’t buzzing 2002 Chevy Tahoe
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).