Top 10 2001 Chevrolet Blazer Questions & Answers

The four wheel drive systems in these vehicles are simple. The push button controls the four wheel drive computer. The computer tells the encoder motor (on transfer case) to shift. When the transfer case shifts there is a vaccum switch on the transfer that is activated which sends vaccum to the accuator under the battery. The accuator pulls a cable to lock the front axle in. This covers all s series trucks and suv's with push button four wheel drive but not with auto or all wheel. Now to answer some questions. If your push button is lit up but will not go in to four high you should try to reset the four wheel drive computer. To reset pull the courtesy light and atc fuses for sixty seconds install fuses then cycle key on and off 5 times. If your transfer case shifts but your front end does not lock in check for vaccum at the switch on the transfer case in and out. If no vaccum out replace switch motormite number 49315 at parts store. If you have vaccum out check accuator.

You have a coolant leak most likely in the heater core. Try disconnecting your heater hoses and coupling them together, then running the engine to see if the leak goes away. If it does, I would have the heater core replaced.

this got easy after a while 2 ways, i had friends who would not take the time to spend 8dollars to buy a harness connector for a new cd player and would splice everything together like takeing the red and yellow wires and connecting them all together as one. this drains ur battery unless ur cd player can completly power down by the power button not all do... but keep this in mind on GM cars the 2 wires of the same wires like purple the one with a black stripe is ground they go together stripe on stripe also there is 2 extra wires one is ORANGE and BROWN u dont need these dont even mess with them even if u have a connector block them off THESE TWO COLORS IS FOR FACTORY STEREO IF SO THESE WIRES CAN AND WILL MAKE IT SO U DONT HAVE DASH LIGHTS so always buy a connector ond dont mess with these wires block them off and dont ground them out.

a bad fuel pump relay will not cause vehicle to only run under 50. the oil pressure switch does bypass relay when pressure builds up. if you are having problems with running need to check fuel pressure. possibly caused by clogged fuel filter

ENGINE OIL PRESSURE SENSOR OR SWITCH REPLACEMENT

TOOLS REQUIRED
J 41712 Oil Pressure Switch Socket

REMOVAL PROCEDURE

IMPORTANT: Clean the area around the sensor and Distributor before removal. Do not allow debris to enter the engine.

1. Remove the distributor.
2. Disconnect the engine oil pressure sensor electrical connector.
3. Remove the engine oil pressure sensor using the J 41712. IMPORTANT: Note the alignment of the engine oil pressure sensor fitting prior to removal.

1. Remove the engine oil pressure sensor fitting, if necessary.

1. Apply sealant GM P/N 12346004 or equivalent to the threads of the fitting and/or the engine oil pressure sensor. NOTE: Refer to Fastener Notice in Service Precautions.
2. Install the engine oil pressure sensor fitting, if removed. Tighten Tighten the engine oil pressure sensor fitting to 15 N.m (11 lb ft) .

1. Install the engine oil pressure sensor. Tighten Using the J 41712, tighten the engine oil pressure sensor to 30 N.m (22 lb ft) .
2. Connect the engine oil pressure sensor electrical connector.
3. Install the distributor.
4. Check and adjust engine oil level.

This is a pump that sits underneath your front bumper on the passenger side. It is about the size of a baseball and has two hoses going into it. I would suggest you replace it yourself as it would cost you about $360.00 if you were to go through the dealer.

Water intrusion is what will typically kill these electric pumps. There is a Technical service bulletin (#04-06-04-015) Regarding this problem, according to the tsb, you will need a new pump and there is a hose assy. #12590627) that has you reroute the pump from future water intrusion or it is guaranteed to fail again.

Although I have had water in the pump I did not see any indication of the inlet hose as the cause. It was suggested that the one way metal check valves ($15.00) that mount to the rt & lt exhaust manifold are worn and allow water from the exhaust to get sucked back into the pump. I first replaced the pump and within a week of dry weather driving the light came back on. I checked the pump and it was again full of water. I just replaced the valves which had deteriorated on the inside. So hopefully this will eliminate the problem. Note - The valves are impossible to remove without removing the 1/2 tubes (held on with 2 nuts) they are attached to the manifold with. The valve threads seize to the tube thread and had to be clamped in a vise to remove - I actually had to hacksaw the valve section to get it off the pipe. Careful as not to damage the threads.

Good luck and try autopartsdirect2you for a new pump and it has life time warranty.

TSB #04-06-04-015 - (Mar 22, 2004)

Condition
Some owners may comment on the check engine light being illuminated. Upon investigation, the technician may find a DTC P0410 indicating that there is a concern in the secondary air injection system.

Cause
Water may have collected in the AIR pump or the vent solenoid and frozen or corroded the pump.

Correction
Replace the AIR pump and install a new inlet hose and solenoid tube assembly using the following procedure:

Prep vehicle.
Raise vehicle on hoist.
Remove shield covering AIR pump.
Remove hose and vacuum lines from pump and solenoid.
Remove AIR pump inlet hose. Do not re-use.
Disconnect electrical connectors from pump and solenoid.
Remove pump mounting bolts and pump.
Transfer isolators from the old pump to the new pump.
Install new AIR pump and bolts to vehicle.

Tighten
Tighten the bolts to 17N·m (12.5 lb ft)

Route new hose assembly up between engine and fender. It should come up near the area between the battery and the coolant bottle.
Connect new inlet hose to pump inlet.
Connect old outlet hose to pump outlet.
Connect electrical connector to pump.
Connect electrical connector for solenoid to connector on the new hose assembly.
Connect the hose with the white nipple to the vacuum source hose.
Connect the remaining hose to the shut off valve.
Install shield covering AIR pump.
Lower vehicle.
Remove coolant reservoir nut nearest the battery.
Route new hose assembly between the battery and the coolant reservoir with the solenoid on top.
Install the solenoid bracket onto the coolant reservoir stud and reinstall the nut back into the vehicle.
Use a wire tie to keep the new hose assembly away from the engine. On four cylinder engines, tie to the AIR outlet hose. On six cylinder engines, tie to an available hole in the radiator fan shroud.

12590627 Hose Assembly - Secondary Air Injection

12568324 Pump, Secondary Air Injection for 2001 L35 + 2000-2003 L43/LN2

12560095 Pump, Secondary Air Injection for 1999-2000 L35

Hope that helps

The EVAP service port is located in the EVAP purge pipe between the EVAP purge solenoid and the EVAP canister. The service port is identified by a green colored cap.



Fig. Showing location of (1) Evaporative Emissions (EVAP) Canister Purge Solenoid and (2) Exhaust Gas Recirculation (EGR) Valve




Fig. EVAP Purge valve solenoid (3) mounting bolt (2) and insulator (1) on 2000-2005 4.8L, 5.3L, 6.0L Engines

Hope this help (remember rated the post).

Diagram for vacuum hose and lines is shown below.Check fig:--

thanks.

Here is the firing order diagram for that engine.

No there is not a fuel shut off switch ! There is a computer energized fuel pump relay ! Here , check out this video from scanner Danner , he is a automotive technician an teacher an Rosedale Tech. GM Fuel Pump Relay Testing