Tip & How-To about GMC Blazer

How to TEST A TORQUE CONVERTER ON A Automatic Transmission

Symptom : chattering or vibration while idling, and in Park.
Transmission sluggish upon Accelaration..

Step 1: chock Block all your wheels, and put your Auto emergency brake on (applied).

Step 2: You step on your gas pedal with engine in Drive, Full throttle. do not hold your regular brake pedal...Hold gas pedal down for 2 seconds your car will try to move. All wheels must not slip.

Step 3: watch your rpm gauge, your stall should be between 2400-2800 rpm depending on specification of manufacturer..
a low reading isbad stator assembly,
a high reading is a slipping one way clutch..

Posted by on

Cars & Trucks Logo

Related Topics:

Related Questions:

1 Answer

1998 blazer 4x4 cannot get it into 4 wheel high when i pus the button th4x4 and low range lights both blink and it goes back to 2 wheel high


Transfer Case Shift Control Switch Indicator Flashes and Returns to Original Mode.
Circuit Description
This symptom usually occurs when a shift into or out of 4LOW will not occur. When the transfer case control module (TCCM) receives a request to shift into or out of 4LOW, the TCCM must see the following parameters before the shift routine can start:
?€¢
The vehicle speed must be below 3 MPH.


?€¢
The transmission must be in neutral.

If the TCCM does not see these conditions the shift control switch indicator lamp will flash for approximately 5 seconds and then return to the original gear.
Test Description
The numbers below refer to the step numbers on the diagnostic table.

  1. This step tests the operation of the transfer case shift control switch to help determine if the system is operating properly.

  2. This step determines if the vehicle speed sensor reading is correct.

  3. This step determines if the park switch reading is correct.

Switch Indicator Lamp Flashes and Returns to Original Mode
Step

Action

Value(s)

Yes

No

Schematic Reference: Transfer Case Control Schematics

1

Important: The transfer case shift control module is not a class 2 device, and therefore a scan tool can not be utilized on this transfer case.

Did you perform A Diagnostic System Check?
--
Go to Step 2
Go to Diagnostic System Check

2

  1. Start the engine.
  2. Place the transmission into NEUTRAL.
  3. Set the park brake.
  4. Depress each of the shift control switch buttons.

Does the transfer case range change with the press of all of the shift control switch buttons?
--
Go to
Testing for Intermittent Conditions and Poor Connections
Go to Step 3

3

Use the scan tool in order to read the vehicle speed sensor on the transmission control Data Lists.

Is the vehicle speed within the specified range?
0 km/h (0 mph)
Go to Step 4
Go to
Powertrain On Board Diagnostic (OBD) System Check for the 4.3L engine

4

  1. Put the transmission in neutral.
  2. Observe the current state of the transmission on the scan tool in the transmission control Data 2 List.

Does the scan tool indicate the transmission is in Neutral?
--
Go to Step 5
Go to
Powertrain On Board Diagnostic (OBD) System Check for the 4.3L engine

5

Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement .

Did you complete the replacement?
--
Go to Step 6
--

6

Operate the vehicle within the conditions for causing the symptom as specified in the supporting text.

Does the symptom re-occur?
--
Go to Step 2
System OK

Feb 12, 2015 | 1998 Chevrolet Blazer

1 Answer

need to change out driver side motormount


To replace motor mount on your vehicle. Park the vehicle in level position. chock the wheels and set the parking brake, put the transmission shifter in park and disconnect the battery positive cable. Motor mount is located between engine and chassis. Support your engine whit the jack using 3/4" piece of plywood and set it under the oil pan. Loosen the motor mount bolt and lift slightly jack upward about 1/2" and remove the motor mount bushing and replace it whit new one and reverse instalation of removal process.

Apr 18, 2014 | 1989 Ford Aerostar Cargo

1 Answer

cods P1747,P0750,P0755,P0743


OK, so is it still setting the codes? Or has that gone away with the transmission harness repair? The idle is controlled by the Idle Air Control (IAC) solenoid. Ford has had a lot of trouble with these. However, the symptom is usually low idle speeds that cause the engine to stall. I think I would be looking for vacuum leaks. Ford 4.6L engines are notorious for the PCV hoses leaking at the elbow where it connects to the back of the throttle body.

Mar 12, 2012 | 1995 Ford Thunderbird

1 Answer

auto transmission fault on toyota landcruiser amazon


Howdy, My name is Mark, I am a mechanic (Auto trans and Diff specialist 23 years) this symptom is common with a broken driveline component, with full time 4WD and centre diff all the drive goes to the wheel with least resistance, (or to broken component) therefore when you engage difflock (Center) the drive then goes 2 ways front and rear so vehicle will drive, could be as simple as stripped spline in front wheel hub, broken CV joint etc. 1 major weakness these vehicles have is if driven with center diff lock engaged on high traction surfaces they do break the front diff, this will give the same symptom but you would of been aware of it when it happened.
To check where the drive is going chock all 4 wheels, park brake on, bonnet up, start engine let it idle down (after cold start), engage reverse (high range open center) from the front of vehicle and off to one side you can see the front axles, if one of them is turning that is where your drive is going, have someone to help you and under no circumstances place your self under or in driving path of vehicle.
Hope this helps

Feb 11, 2009 | 1999 Toyota Land Cruiser

Not finding what you are looking for?

2,382 people viewed this tip

Ask a Question

Usually answered in minutes!

Top GMC Experts

yadayada
yadayada

Level 3 Expert

76848 Answers

Freddy

Level 3 Expert

1311 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a GMC Expert? Answer questions, earn points and help others

Answer questions

Loading...