Jun 062016
 

Blower Motor 2008 Chevy ImpalaThe blower motor in my 2008 Chevy impala 3.5 engine cuts out completely. A few swift kicks under the glove box usually gets it going again. There are no strange noises,
all speeds work, and the temperature adjusts as it should.


RESPONSE

  1. Check the connections at the blower motor
  2. Confirm battery negative and positive when the blower is not working
  3. Replace blower motor

The kicking under the dash is probably enough to jar the internal brushes in the motor just enough to get it to make sufficient contact. This allows the motor to operate until the next time. Replacing the blower motor would be the fix.

2008 Chevy impala Blower Motor Replacement

 

  • Remove the right closeout insulator.
  • Disconnect the blower motor electrical connector.

2008 Chevy Impala insulator removal diagram

  1. Push Pin Retainer (Qty: 2)

Tip
Remove the courtesy lamp, if equipped.

Jun 022016
 

2002 Chevy SilveradoWhen my 2002 Cheverolet Silverado 1500 4WD Ext Cab LS is moving the front end rattle badly. When i put in 4wd the rattle is quite a bit quieter however the 4wd does not engage it just makes a clicking sound.  I Know the front end is out of alignment and needs to be realigned , but the rattle noise and 4wd malfunction is new. What could be the problem or problems?


RESPONSE

There are many possibilities when it comes to a rattle noise or any noise for that mater. Could be something loose or worn. A hub bearing assembly going out could be at fault. Maybe an axle-shaft or universal joint going bad. Could be internal in the front differential. Possible 4WD actuator issue.

Rattle in front end

Front Drive Axle Description and Operation

Selectable Four Wheel Drive (S4WD) Front Axle Description and Operation

The Selectable Four Wheel Drive (S4WD) Front Axle consist of the following components:

    • Differential Carrier Housing
    • Differential Assembly
    • Output Shafts (Left and Right Side)
    • Inner Axle Shaft Housing
    • Inner Axle Shaft (Right Side)
    • Clutch Fork
    • Clutch Fork Sleeve
    • Electric Motor Actuator

The front axle on Selectable Four Wheel Drive model vehicles uses a central disconnect feature in order to engage and disengage the front axle. When the driver engages the 4WD system, the Transfer Case Control Module sends a signal to the electric motor actuator to energize and extend the plunger inside. The extended plunger moves the clutch fork and clutch fork sleeve across the inner axle shaft and the clutch fork shaft and locks the two shafts together. The locking of the two shafts allows the axle to operate in the same manner as a semi-floating rear axle. A propeller shaft connects the transfer case to the front axle. The differential carrier assembly uses a conventional ring and pinion gear set to transmit the driving force of the engine to the wheels. The open differential allows the wheels to turn at different rates of speed while the axle continues to transmit the driving force. This prevents tire scuffing when going around corners and premature wear on internal axle parts. The ring and pinion set and the differential are contained within the carrier. The axle identification number is located on top of the differential carrier assembly or on a label on the bottom of the right half of differential carrier assembly. The drive axles are completely flexible assemblies consisting of inner and outer constant velocity CV joints protected by thermoplastic boots and connected by a wheel drive shaft.

Full-Time Four Wheel Drive (F4WD) Front Axle Description and Operation

The Full-Time Four Wheel Drive (F4WD) Front Axle consist of the following components:

    • Differential Carrier Housing
    • Differential Assembly
    • Output Shaft (Left Side)
    • Inner Axle Shaft Housing
    • Inner Axle Shaft (Right Side)

The front axle on Full-Time Four Wheel Drive model vehicles does not have a central disconnect feature in order to engage and disengage the front axle. The left and right axle shafts are connected directly to the differential case assembly. This allows the axle shafts and the propeller shaft to spin continuously. The transfer case controls the amount of torque applied to the front axle. The remaining components are the same as the selectable four wheel drive axle.

May 242016
 

2004-chevy-silveradoIt stopped running one night on my way home from work. Like it ran out of gas. I had a New fuel pump and filter put in and still won’t run


RESPONSE

No Start Diagnostics

Quick test would be to spray some starting fluid in the air filter and see if it tries to start. If it does you need to concentrate on the fuel system. If it does not, check for spark next.

May 152016
 

Code C0327 Chevy Suburban 2005Had code C0327 on my 2005 Chevy Suburban 1500 Z71. Replaced Encoder Motor Sensor. Transfer Case shifted and worked just fine for a few days, then quit working. I discovered that I had not secured the wiring harness and the drive shaft wore through a wire to the encoder motor.(green with black stripe) I repaired the wire, but now nothing happens when selecting any of the control panel buttons, none of the lights come on. All the lights will light momentarily when first turning on the key, but that’s it. They don’t light or blink when selected. I have checked all the fuses (at least in the two locations I know of. Under the hood by the battery and the left side of the dash) Did I fry the Encoder Motor Sensor or something else? Is there a voltage check that I can perform to make sure I am getting the voltage to the encoder motor? If so, could you supply me with the pins to check and the voltage to expect and maybe a wiring diagram? Continuity checks? Thanks


RESPONSE

Some customers may comment that the Service 4WD light is on, the 4WD system is inoperative or the 4WD switch indicator lights are blinking.

Code C0327

Technicians may find DTC C0327 in the Transfer Case Control Module (TCCM). This would indicate an encoder sensor malfunction.

It is also possible that the module may be in a mode that will not allow any shifts or updates for the software or calibrations. If this occurs, the TREC fuse (in the engine compartment) must be pulled and reinstalled after 30 seconds. This should allow further operation and service of the system. If a C0550 code is found, this is an unrelated concern and SI diagnostics should be followed for this concern.

The Fix:

I would just reprogram the tccs module if you haven’t already. This should eliminate the problem.

Important: Carefully handle and install the new encoder. Improper installation of the encoder could result in a repeat failure.

  1. Raise the vehicle.
  2. Disconnect the transfer case motor/encoder wiring harness.
  3. Remove the four bolts that secure the motor/encoder to the transfer case.
  4. Remove the motor/encoder from the transfer case.
  5. Remove the black plastic gasket/over plate from the motor/encoder.
  6. Push out the two “single” locking tabs (two lower arrows in illustration above) located on the underside of the housing (motor end).
    6.2. At the other end of the gasket/cover plate, place a flathead screwdriver tip (1) between the gasket/cover plate and the motor housing near the “dual” locking tabs. Twist the screwdriver clockwise/counterclockwise at both sides until the locking tabs break and the gasket/cover plate comes off.
    6.3. Discard the gasket/cover plate.

 

  • Avoiding the wire connection, take two small flathead screwdrivers (one on each side of the encoder) and rock the encoder sensor out using light pressure on each screwdriver.
  • Gently remove the encoder sensor from the wire harness connector. Pry these apart by inserting a small flathead screwdriver between the terminals and the harness connector. Verify that no damage or corrosion exists on either male encoder terminals or female wiring harness terminals.
  • Install the new encoder sensor by connecting to the harness and then gently sliding the encoder sensor over the motor shaft. The hex feature (3) on the encoder should face down toward the motor housing. Make sure the tab (1) on the encoder mates with the notch (2) on the shaft. If the encoder tab is not aligned with the output shaft, rotate the encoder inner ring by hand to mate properly. Press the encoder fully onto the shaft and into the housing.

Important:

Make sure the encoder cover (1) is flush or below the surface of the motor housing and fully seated into place.
Ensure that the new encoder/harness assembly is fully seated to the encoder sensor.

Install a new gasket/cover plate. This should snap into position. Make sure all the four tabs are FULLY engaged.
Install the motor/encoder onto the transfer case using four M8-1.25 X .35 flange head bolts.

Tighten
Tighten all four bolts to 13.5 to 17.6 N·m (10 to 13 lb ft).
Connect the transfer case motor/encoder wiring harness.
Following normal SPS reprogramming procedures, reprogram the transfer case control module with the latest software calibration.
Verify that the 4WD system is operational.

 

May 152016
 

2000 Chevy BlazerI had to change my battery after my blazer sat for a week when i changed it, it will crank but not start


RESPONSE

If it ran just fine before you worked on it, the most likely cause would be something did not get hooked back correctly. Double check your work and insure there is no corrosion on the connections.

You may need to cycle the ignition key on and off to prime the fuel system. Setting for a while may have allowed the fuel pressure to bleed off.

Try spraying some starting fluid in the air filter, if the engine tries to start, you know it is a lack of fuel causing the trouble. If not, it may be electrical.

May 102016
 

1982 Chevy CamaroIs an old school Camaro hard to maintain? Is it easy to improve and does it cost a lot for parts if needed? Also does the number of miles matter? Is it a good car to keep?


RESPONSE

Hard to maintain – No if you are an ASE Certified mechanic with lots of tools and lots of experience with carburetors and oil leaks.

Easy to improve – Sure if you have a pocket full of money that gets refilled often. Cost of parts are relevant to the specific part in which you speak. Oil filters and brake pads are cheap… transmissions and camshafts not so much.  The miles and weather matter most.

good car to keep? If it is an all original Z28 with low miles and perfect body, YES. A plan Jane Camaro with six different body panels and an aftermarket engine and a rigged up stereo system…. No so much.

I would not recommend these years as a collectors vehicle. Something is worth only what someone else is willing to pay for it.

May 092016
 

1998 Chevy Astro Starter ProblemThe battery has a full charge and plenty of gas and it wont start could it be the starter?


RESPONSE

Of course it could be if the engine is not turning over at all. But testing the starting system first may be the best course of action.

  • Check for good battery negative at starter case
  • Have someone hold the ignition key in the “START” position
  • Check for Battery Positive at the “S” terminal on the starter, if seen replace starter. If not seen, check the starter relay and neutral switch. Then trace wiring in the wiring-harness.

1998 Chevy Astro Van Starter Wiring Diagram

1998-chevy-astro-starting-charging-starting-circuit-1-of-1

Starting System Operation

Voltage is applied at all times to the Ignition Switch from Fuse 6 through the RED (242) wire. When the Ignition Switch is turned to the Start position, voltage is then applied to the CRANK fuse through the YEL (5) wire. From the CRANK fuse, voltage is applied to the Park Neutral Position and Backup Lamp Switch through the PPL (806) wire. When the Park Neutral Position and Backup Lamp Switch is placed in Park or Neutral, voltage is then applied to the coil of the Starter Relay through the YEL (1737) wire. Since the Starter Relay is permanently grounded at G104 through the BLK (850) wire, the relay will energize.

Voltage is applied at all times to the  Relay contacts from Fuse 6 through the RED (242) wire. When the Relay energizes, the relay contacts close, and voltage is then applied to the Starter Solenoid. Since the  Solenoid is permanently case grounded, the Solenoid will energize two coils. The Pull-in Winding coil will energize to pull the  Solenoid contacts closed. When the contacts close, a plunger on the contacts will cause the Pull-in Winding coil circuit to open. Then the Hold-in Winding coil will hold the Solenoid contacts closed. Voltage is then applied to the Starter Motor from the Battery through the BLK (1) wire and closed contacts of the  Solenoid. Since the  Motor is also permanently case grounded, the motor will run until the Ignition Switch is moved out of Start position. When this happens, a spring in the  Solenoid will move the  Solenoid contacts and the plunger back to the rest position.

 

 

May 092016
 

2000 Chevy ExpressCheck codes are misfire. cylinders 5 and 7 show solid misfires. changed wires, plugs, fuel pressure reg, and injection spider. still misfires. plugs show good spark. compression good. block check good.


RESPONSE

The Code P0300 means that a cylinder(s) is misfiring or is randomly misfiring. Start by checking for intake leaks, intake gaskets are common caused of multi-cylinder misfiring. If no leak are found the next step is to replace the spark plugs. If the problem persist more tests needs to be done to diagnose problem, see “Possible Causes”.

Possible causes
– Faulty spark plug (s)
– Faulty ignition coil (s)
– Clogged or faulty fuel injector (s)
– Intake air leak
– Fuel injectors harness is open or shorted
– Fuel Injectors circuit poor electrical connection
– Ignition coils harness is open or shorted
– Ignition coils circuit poor electrical connection
– Insufficient cylinders compression
– Incorrect fuel pressure

When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.

May 062016
 

Started the truck a few weeks ago started fine then the next day went to start it and it was sluggish but when i shut if off it just clicked. So i assumed it was the starter just got the time to swipe it out today approximately three weeks since the starter assumption but after changing same results today all gauges are worming tested the batteries glow plugs are cycling and the indicator light comes one seem i have good voltage but the voltage meter is not showing it and when u start the truck it just clicks with no indication that it will crank at a loss considering it took 4 hours to to get the old starter off in the freezing cold today Really needing some suggestions as we are getting snow and more coming it my winter work vehicle. Thanks in advance for any help or advice someone could lend


RESPONSE

Replace the battery.

 

It takes very little to illuminate lights and activate glow plugs. The starter however requires the most juice to turn over the engine. The battery may read 12 volts setting still without load. When you load test it (draw amperage) the voltage will drop below usable condition.

I use a Battery Load Tester to check my batteries.

Apr 282016
 

2003-chevy-silveradoWhy would my ABS Brake light come on and my speedometer start jumping when I’m in 2wheel drive and hit 30-40mph. And doesn’t do it in 4wheel hi or low?


RESPONSE

The most common reason for the ABS Brake light to come on is when the brake fluid level is low. Since the brake fluid level moves around it may come on while moving up or down hills or on heavy acceleration or deceleration. As for the Speedometer jumping around, it is possibly a VSS- Vehicle Speed Sensor issue or a malfunction in the gauge cluster assembly. Gauge cluster issues are also common on these Chevy trucks