20 Most Recent 1996 Chevrolet C1500 - Page 6 Questions & Answers

Does this happen only when the engine is hot?

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On vehicle with high mileage (140,000 miles+),I recommend you to pull the spark plug one at a time.

Check for excess smell of gas and WET PLUG.

This is the DO IT YOUR SELF method to detect potential leaky fuel injectors.


Compression and fuel pressure testes are important.

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To rule out fuel pressure problem, please fill the tank to above 3/4.

A failing fuel pump will not deliver the correct pressure to the regulator.


The scientific term is call head pressure.

Check you service record for the last fuel filter change.


Please check out the plugs' condition and post more information on reply.

The symptoms of a defective component within the DI system are exactly the same as those you would encounter in a conventional or HEI system. Some of these symptoms are:
- Hard or no Starting - Rough Idle - Fuel Poor Economy - Engine misses under load or while accelerating
If you suspect a problem in the ignition system, there are certain preliminary checks which you should carry out before you begin to check the electronic portions of the system. First, it is extremely important to make sure the vehicle battery is in a good state of charge. A defective or poorly charged battery will cause the various components of the ignition system to read incorrectly when they are being tested. Second, make sure all wiring connections are clean and tight, not only at the battery, but also at the distributor cap, ignition coil, and at the electronic control module.

1. Check the cap for tiny holes and carbon tracks as follows.
   1. Remove the cap and place an ohmmeter lead on the cap terminal.
      
   2. Use the other lead to probe all the other terminals and the center carbon ball.
2. If the readings are not infinite, the cap must be replaced.

SECONDARY SPARK TEST
It is imperative to check the secondary ignition circuit first. If the secondary circuit checks out properly, then the engine condition is probably not the fault of the ignition system. To check the secondary ignition system, perform a simple spark test.
- Remove one of the plug wires and insert some sort of extension in the plug socket. An old spark plug with the ground electrode removed makes a good extension.
- Hold the wire and extension about 1 / 4 in. (0.25mm) away from the block and crank the engine.
- If a normal spark occurs, then the problem is most likely not in the ignition system. Check for fuel system problems, or fouled spark plugs.
- If, however, there is no spark or a weak spark, then test the ignition coil and the camshaft and crankshaft position sensors.

IGNITION COIL - Make sure the ignition switch is OFF.
(see Figure 1)

1. Tag and disconnect the wires from the ignition coil.
   
2. Using a digital ohmmeter set on the high scale, probe the ignition coil as shown in Step 1 of the accompanying illustration.

Fig. 1: Ignition coil testing points

1. The reading should be infinite. If not replace the coil.
   
2. Using the low scale of the ohmmeter, probe the ignition coil as shown in Step 2 of the accompanying illustration. The reading should be 0.1 ohms, if not replace the coil.
   
3. Using the high scale of the ohmmeter, probe the ignition coil as shown in Step 3 of the accompanying illustration. The reading should be 5k-25k ohms, if not replace the coil.
   
4. Reconnect the wires to the ignition coil.

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Have the cooling fan clutch checked.

Sounds like you have air in the lines, or rear brakes out of adjustment. Make sure the rear brakes are adjusted correctly, then bleed the system. Hope this helps, TJ

no, sorry . but i do have a suggestion that might help. do the taillights work? if so check the brake light switch on the brake pedal. also , does the high mount light work and not the rear ones? if so you may want to check the turn signal switch to make sure there is voltage on that circuit.

You need to pull the distributor back out, put motor to TDC
now you say its always a tooth off...the timing chain may be alittle worn..so when you are trying to put the distribor back in ...put a socket or something... to move the crankshaft.....move it back and forth untill the distributor falls in....AT the number one plug on cap....
Hope this helps you out ??

the timing chain on the 4.3 is on the front of the engine. you will need to remove the water pump and the crank pulley to access the timing chain cover. You can see the cover if you look behind and above the crank pulley. the cover will be held on by about 15-20 bolts.

make sure you line up the timing mark on the cam gear with the timing mark on the crank gear. there will be a dot on each. when the are lined up the dot on the crank pulley will be at 12 oclock and the dot on the cam gear will be at six oclock.

you will need a puller to remove the crank pulley and the crank gear. Other than that its just nuts and bolts. I’m happy to assist further over the phone at https://www.6ya.com/expert/jeremy_d728a59f986299fa

OK the starter has bushings in either end of the starter which the armature rides in, if those bearings are worn out the armature will drag on the fields and wont start the starter will need to be replaced

You need to have the PCM scanned to find out what the code[s] are, the problem could be a number of things.

The original one will be under the hood in the black electrical box to the rear of the batterie.If they added one with the security system it may be under the dash.

my 97 blazzer had 4.3

the fuel sending unit is located on the fuel pump itself,located on the side of your fuel pump inside of the gas tank itself.you'll need to replace the entire fuel pump in order to solve fuel level issues. the fuel tank will have to come out,and then the fuel pump removed and replaced.it really stinks to have a bad fuel guage reading false,only to find out that the entire fuel pump has to be replaced to solve a false reading . feel free to call your local autozone or advance autoparts store for details. but here is a hint" the more fuel in your tank at the time of replacement of the fuel pump,the more expensive it will be.due to the fuel tank being "heavy" that has been my expereince so far. good luck and thank you for choosing fixya.com

Step 1 is 44 Inch lbs.
Step 2 is 89 Inch lbs.

Replace the fuel filter.

This unit is part of the distributor.

OPERATION


See Figure 1
The ECM uses the camshaft signal to determine the position of the No. 1 cylinder piston during its power stroke. The signal is used by the ECM to calculate fuel injection mode of operation.
If the cam signal is lost while the engine is running, the fuel injection system will shift to a calculated fuel injected mode based on the last fuel injection pulse, and the engine will continue to run.

Fig. Fig. 1: Camshaft Position (CMP) sensor location

TESTING


See Figure 2

Fig. Fig. 2: Camshaft Position (CMP) sensor wiring schematic

1. Disconnect the CMP sensor wiring harness and connect an LED test light between CMP harness terminal C and battery ground.
2. With the ignition ON and the engine off, verify that the test light illuminates.
3. If not as specified, repair or replace the fuse and/or wiring.
4. Carefully connect the test light between CMP harness terminal A and C and verify that the test light illuminates.
5. If not as specified, repair the CMP harness ground circuit (terminal A).
6. Turn the ignition OFF and disconnect the test light.
7. Next, connect suitable jumper wires between the CMP sensor and CMP sensor harness. Connect a DC volt meter to the jumper wire corresponding to CMP terminal B and battery ground.
8. Start the engine and verify that the voltage signal is 5-7 volts.
9. If it is not as specified, the CMP sensor may be faulty.

REMOVAL & INSTALLATION

1. Disconnect the negative battery cable.
2. Detach the sensor harness connector at the sensor.
3. Unfasten the retaining bolt, then remove the sensor from the camshaft housing. Inspect the sensor O-ring for wear, cracks or leakage and replace if necessary.

To install:

1. Lubricate the O-ring with clean engine oil, then place on the sensor. Install the sensor into the camshaft housing.
2. Install the CMP sensor retaining bolt, then tighten to 88 inch lbs. (10 Nm).
3. Attach the sensor harness connector.
4. Connect the negative battery cable.

fuel pump relay out

replace computer