Thursday, July 28, 2011

Chevy, Gmc, S10 Blazer, Jimmy, adjust, check, timing

Chevy, Gmc, S10 Blazer, Jimmy, adjust, check, timing step by step guide with full pictures:

Refer to illustrations 35.4 and 35,5

Note: It is imperative that the procedures included on the Vehicle Emissions Control Information label be followed when adjusting the ignition timing, The label will include all information concerning preliminary steps to be performed before adjusting the timing, as well as the timing specifications,

1: Locate the VECI label under the hood and read through and perform all preliminary instructions concerning ignition timing,

2: Locate the timing mark pointer plate located beside the crankshaft pulley, The 0 mark represents top dead center (TDC), The pointer plate will be marked in either one or two-degree increments and should have the
proper timing mark for your particular engine noted. If not, count back from the 0 mark the
correct number of degrees BTOC, as noted on the VECI label, and mark the plate,

3: Locate the notch on the crankshaft balancer

of pulley and mark it with chalk or a dab of paint so it will be visible under the timing light

4: With the ignition off, connect the pickup lead of the timing light to the number one spark plug wire (see illustration). Do not pierce the wire or attempt to insert a wire between the boot and the wire. Connect the timing light power leads according to the manufacturer's instructions. Note: Some engines incorporate a magnetic timing probe hole for use with special electronic timing equipment. Consult the manufacturer's instructions for proper use of this equipment.

5: Start the engine, aim the timing light at the timing mark by the crankshaft pulley and note which timing mark the notch on the pulley is lining up with (see illustration).

6: If the notch is not lining up with the correct mark, loosen the distributor hold-down bolt and rotate the distributor until the notch is lined up with the correct timing mark.

7: Retighten the hold-down bolt and recheck the timing.

8: Turn off the engine and disconnect the. timing light Reconnect the number one spark plug wire, if removed.

Chevy, Gmc, S10 Blazer, Jimmy, adjust, check, timing

Chevy, Gmc, S10 Blazer, Jimmy, how to replace spark plug, gap

Chevy, Gmc, S10 Blazer, Jimmy, how to replace spark plug, gap. Step by step guide with pictures.

1 The spark plugs are located on each side of V6 engines and on the left (driver's) side of four-cylinder engines. They may or may not be easily accessible for removal. If the vehicle is equipped with air-conditioning or power steering, some of the plugs may be tricky to remove. Special extension or swivel
tools may be necessary. Make a survey under the hood to determine if special tools will be needed.

2 In most cases, the tools necessary for spark plug replacement include a spark plug socket which fits onto a ratchet (spark plug sockets are padded inside to prevent damage to the porcelain insulators on the new plugs), various extensions and a gap gauge
to check and adjust the gaps on the new plugs (see illustration).
  A special plug wire removal tool is available for separating the wire boots from the spark plugs, but it isn't absolutely necessary. A torque wrench should be used to tighten the new plugs.

3 The best approach when replacing the spark plugs is to purchase the new ones in advance, adjust them to the proper gap and replace them one at a time. When buying the new spark plugs, be sure to obtain the correct plug type for your particular engine. This
information can be found on the Vehicle Emission Control Information label located under the hood, and in the owner's manual . If differences exist between the plug specified on the emissions label and in this Chapter's Specifications or the owner's manual, assume that the emissions label is correct

4 Allow the engine to cool completely before attempting to remove any of the plugs. While you're waiting for the engine to cool, check the new plugs for defects and adjust the gaps.

5 The gap is checked by inserting the proper thickness gauge between the electrodes at the tip of the plug (see illustration).

The gap between the electrodes should be the same as the one specified on the Vehicle

6: With the engine cool, remove the spark plug wire from one spark plug. Pull only on the boot at the end of the wire - do not pull on the wire. A plug wire removal tool should be used if available (see illustration).

7: If compressed air is available, use it to blow any dirt or foreign material away from the spark plug hole. A common bicycle pump will also work. The idea here is to eliminate the possibility of debris falling into the cylinder as the spark plug is removed.

8: Place the spark plug socket over the plug and remove it from the engine by turning it in a counterclockwise direction.

9: Cornpare the spark plug to those shown in the photos on the inside back cover of this manual to get an indication of the general running condition of the engine.

10: Thread one of the new plugs into the hole until you can no longer turn it with your fingers, then tighten it with a torque wrench (if available) or the ratchet. It might be a good idea to slip a short length of rubber hose over the end of the plug to use as a tool to thread it into place (see illustration). The hose will grip the plug well enough to turn it, but will start to slip if the plug begins to cross-thread. in the hole - this will prevent damaged

threads and the accompanying repair costs.

11 Before pushing the spark plug wire onto the end of the plug, inspect it following the
procedures outlined in Section 37.

12 Attach the plug wire to the new spark plug, again using a twisting motion on the boot until it's seated on the spark plug.

13 Repeat the procedure for the remaining
spark plugs, replacing them one at a time to prevent mixing up the spark plug wires.

Chevy, Gmc, S10 Blazer, Jimmy, how to check or replace fuel filter

Chevy, Gmc, S10 Blazer, Jimmy, how to check or replace fuel filter, step by step instructions with pictures.


Warning: Gasoline is extremely flammable, so take extra precautions when you work on  any part of the fuel system.

Carbureted models:

Refer to illustrations 18.6 and 18.8

1 On these models the fuel filter is located inside the fuel inlet nut at the carburetor. It's made of either pleated paper or porous bronze and cannot be cleaned or reused.

2 The job should be done with the engine cold (after sitting at least three hours). The necessary tools include open-end wrenches to fit the fuel line nuts. Flare nut wrenches (which wrap around the nut) should be used if available. In addition, you have to obtain the replacement filter (make sure it's for your specific vehicle and engine) and some clean rags.

3 Remove the air cleaner assembly. If vacuum hoses must be disconnected, be sure to note their positions and/or tag them to ensure that they are reinstalled correctly.

4 Follow the fuel line from the fuel pump to the point where it enters the carburetor. In most cases the fuel line will be metal all the way from the fuel pump to the carburetor.

5 Place some rags under the fuel inlet fittings to catch spilled fuel as the fittings are disconnected.

6 With the proper size wrench, hold the fuel inlet nut immediately next to the carburetor body. Now loosen the fitting at the end of the metal fuel line. Make sure the fuel inlet nut next to the carburetor is held securely while the fuel line is disconnected (see illustration).

7 After the fuel line is disconnected, move it aside better access  to the inlet nut. Don't crimp the fuel line.

B Unscrew the fuel inlet nut, which was previously held steady. As this fitting is drawn away from the carburetor body, be careful not to lose the thin washer-type gasket on the nut or the spring, located behind the fuel filter. Also pay close attention to how the filter is installed (see illustration).

9 Compare the old filter with the new one to make sure they're the same length and design.

10 Reinstall the spring in the carburetor body.

11 Place the filter in position ( a gasket is usually supplied with the new filter) and tighten the nut, but be careful not to over tighten it as the threads can strip easily, causing fuel leaks. Reconnect the fuel line to the fuel inlet nut, again using caution to avoid cross-threading the nut. Use a backup wrench on the fuel inlet nut while tightening the fuel line fitting.

12 Start the engine and check carefully for leaks. If the fuel line fitting leaks, disconnect it and check for stripped or damaged threads. If the fuel line fitting has stripped threads, remove the entire line and have a
repair shop install a new fitting. If the threads look all right, purchase some thread sealing tape thread sealing
tape and wrap:'tne''tt'l s with it. Inlet nut repair kits are available at most auto parts stores to overcome leaking at the fuel inlet nut.

Fuel-injected models

Refer to illustration 18. 15

Warning: See Chapter 4 and relieve the fuel system

pressure before proceeding.

13 Fuel-injected engines employ an in-line

fuel filter. The fuel filter is located under the vehicle.

14 With the engine cold, place a container,

newspapers or rags under the fuel filter.

1"5 Use wrenches .to disconnect the fuel

lines and detach the filter from the frame (see


16 Install the new filter by reversing the removal procedure. Make sure the arrow on the filter points toward the engine, not the fuel tank. Tighten the fittings securely, but don't cross thread them

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