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I assume this is the HEI coil. If not let me know and I can help further. Instructions
Put your safety first. Engage your emergency or parking
brake. Also, disconnect the negative battery cable from the Chevy
Make the ignition system visible. On older models, you may
need to remove the plenum extension for the intake manifold using a
screwdriver or wrench. For newer models, remove the cover for the fuel
Look for additional parts that you need to remove. For HEI
systems, you need to access the distributor through the cap. Other
systems use an ignition coil harness connector.
Disconnect the secondary wires, or spark plug wires, from
the ignition coil. Tag each wire with masking tape, so you know which
terminal to reconnect the wire to. If you connect the wrong wires to the
terminals, your Chevy Corvette won't start.
Detach the ignition coil mounting bolts and remove the
ignition coil. The amount and type of bolts vary depending on the part
number for the Corvette ignition coil. You may also need to remove the
ignition coil arc seal.
Clean the distributor cap with a soft cloth. Now is a good
time to replace the seal, if needed. Insert your new ignition coil and
secure it in place. As you reassemble, use a Torque wrench to tighten
the mounting bolts or screws to 13 inch pounds (1.5 Nm) of torque.
Reassemble the rest of the parts and reconnect your battery. Start the Chevy Corvette to ensure the repair worked.
As you saying you have replaced ignition coil and crank sensor, next is check relay fro ignition system in fuse box replace relay with other one for testing purpose only, if no change then next,if you can check continuity of all wire form Engine Control Unit to Ignition coil, if all wire are ok then replace Engine Control Unit (ECM) if any wire found no contunity please reconnect same wire or repair wire it will solve problem if not then you have to replace ECM. thanks.
yes...if you car is a 6 cylinder..then there are 6 plugs...just find 6 identical wires that all murge on one device (ignition coil) follow the wires to the other end where they are connected to the spark plugs... just pull the wires loose..then unbolt the sparkplug.. bolt the new one in.. then reconnect the wires in the same spot( do 1 at a time so they dont get mixed up...
1. Bad or fouled Spark Plug at #1 Cylinder.
2. Bad or misfiring Wire going from the #1 on the Distributor/Electronic Ignition Coil to the #1 Cylinder.
3. Misfiring at the #1 on the Distributor/Electronic Iginition Coil.
a. Unplug the #1 Wire at the #1 on the Distributor/Electronic Ignition Coil.
b. Using an Auto electrical testing: Probe, wire and ground clip electrical, stick the Probe into the opening at the #1 Distributor/Electronic Ignition Coil. Use the grounding clip - clipped to a portion on the engine.
c. Start the Vehicle and check for rhythmic spark.
d. If there is NOT rhythmic spark, the Distributor/Electronic Ignition Coil needs to be replaced.
e. Turn off the engine.
f. If there is rhythmic spark: Reconnect the #1 Wire at #1 on the Distrubutor/Electronic Igntion Coil.
g. Disconnect the #1 Wire from the #1 Spark Plug.
h. Again using an Auto electrical testing: Probe, wire and ground clip. Insert the Probe into the end of the #1 Wire and clip the ground clip onto the engine.
i. Start the engine again.
j. Again Check for rhythmic spark.
k. If there is NOT rhythmic spark the #1 Wire needs to be replaced. (Replace all Wires as a Set).
l. If there is rhythmic spark then the #1 Wire is fine.
m. Turn off the engine,
n. Remove and Inspect the #1 Spark Plug. Clean if necessary and Regap.
o. Reinstall the Spark Plug and reconnect the #1 Wire.
p. Restart the engine.
q, If the code reappears:
r. Replace all the Spark Plugs.
Let me know if this helped or if you have additional information or questions. Feel free to contact me at FixYa.Com.
This is for the 4.6L motor...I'll post for the 5.0L and 5.8L....you didn't post your engine size so please pick the applicable motor:
Fuel injection systems remain under pressure, even after the engine has been turned OFF. The fuel system pressure must be relieved before disconnecting any fuel lines. Failure to do so may result in fire and/or personal injury.
If equipped with air suspension, the air suspension switch, located on the right-hand side of the luggage compartment, must be turned to the OFF position before raising the vehicle.
Disconnect the negative battery cable.
Drain the engine cooling system.
Relieve the fuel system pressure as follows:
Remove the fuel tank fill cap to relieve the pressure in the fuel tank.
Remove the cap from the Schrader valve located on the fuel injection supply manifold.
Attach Fuel Pressure Gauge T80L-9974-B or equivalent, to the Schrader valve and drain the fuel through the drain tube into a suitable container.
After the fuel system pressure is relieved, remove the fuel pressure gauge and install the cap on the Schrader valve. Secure the fuel tank fill cap.
Disconnect the fuel supply and return lines.
Remove the windshield wiper governor (module).
Remove the engine air cleaner outlet tube.
Release the drive belt tensioner and remove the accessory drive belt.
Tag and disconnect the ignition wires from the spark plugs. Disconnect the ignition wire brackets from the cylinder head cover studs.
Disconnect the wiring from both ignition coils and the Camshaft Position (CMP) sensor. Tag and disconnect all ignition wires from both ignition coils. Remove 2 bolts retaining the ignition wire bracket to the ignition coil brackets and remove the ignition wire assembly.
Disconnect the alternator wiring harness from the junction block at the fender apron and alternator. Remove the bolts retaining the alternator brace to the intake manifold and the alternator to the cylinder block and remove the alternator.
Raise and safely support the vehicle.
Disconnect the oil pressure sensor and power steering control valve actuator wiring and position the wiring harness out of the way.
Disconnect the EGR valve to exhaust manifold tube from the right-hand exhaust manifold.
Lower the vehicle.
Remove and detach the engine/transmission harness connector from the retaining bracket on the power brake booster.
Detach the A/C compressor clutch, Crankshaft Position (CKP) sensor and the canister purge solenoid wiring connectors.
Remove the PCV valve from the cylinder head cover and disconnect the canister purge vent hose from the PCV valve.
Disconnect the accelerator and cruise control cables from the throttle body. Remove the accelerator cable bracket from the intake manifold and position out of the way.
Disconnect the vacuum hose from the throttle body adapter port.
Disconnect both Heated Oxygen Sensors (HO2S) and the heater water hose.
Remove 2 bolts retaining the thermostat housing to the intake manifold and position the upper hose and thermostat housing out of the way.
The 2 thermostat housing bolts are also used to retain the intake manifold.
Remove 9 bolts retaining the intake manifold to the cylinder heads and remove the intake manifold. Remove and discard the gaskets.
If replacing the intake manifold, swap over the necessary parts.
Clean all gasket mating surfaces.
Position new intake manifold gaskets on the cylinder heads. Make sure the alignment tabs on the gaskets are aligned with the holes in the cylinder heads.
Install the intake manifold and 9 retaining bolts. Hand tighten the right-rear bolt (viewed from the front of the engine) before final tightening, then torque the bolts, in sequence, to 15-22 ft. lbs. (20-30 Nm).
Inspect and if necessary, replace the O-ring seal on the thermostat housing. Position the housing and upper hose and install 2 retaining bolts. Torque to 15-22 ft. lbs. (20-30 Nm).
Reconnect the heater water hose.
Reconnect both HO2S wiring connectors.
Reconnect the vacuum hose to the throttle body adapter vacuum port.
Install the accelerator cable bracket on the intake manifold and connect the accelerator and cruise control cables to the throttle body.
Install the PCV valve in the cylinder head cover and connect the canister purge solenoid vent hose. Reconnect the A/C compressor clutch, CKP sensor and canister purge solenoid wiring connectors.
Reconnect the engine/transmission harness connector. Install the connector on the retaining bracket on the power brake booster.
Raise and safely support the vehicle.
Reconnect the EGR valve to exhaust manifold tube to the right-hand exhaust manifold. Torque the tube nut to 26-33 ft. lbs. (35-45 Nm).
Reconnect the power steering control valve actuator and the oil pressure sensor wiring connectors.
Lower the vehicle.
Position the alternator and install 2 retaining bolts. Torque to 15-22 ft. lbs. (20-30 Nm). Install 2 bolts retaining the alternator brace to the intake manifold and torque to 71-106 inch lbs. (8-12 Nm).
Reconnect the alternator wiring harness to the alternator, right-hand fender apron and junction block.
Position the ignition wire assembly on the engine and install 2 bolts retaining the ignition wire bracket to the ignition coil brackets. Torque the bolts to 71-106 inch lbs. (8-12 Nm).
Reconnect the ignition wires to the ignition coils in their proper positions. Reconnect the ignition wires to the spark plugs.
Reconnect the ignition wire brackets on the cylinder head cover studs. Reconnect the wiring connectors to both ignition coils and the CMP sensor.
Install the accessory drive belt.
Install the engine air cleaner outlet tube.
Install the windshield wiper governor.
Reconnect the fuel supply and return lines.
Fill and bleed the engine cooling system.
Reconnect the negative battery cable.
If equipped with air suspension, turn the air suspension switch to the ON position.
Start the engine and check for leaks.
Road test the vehicle and check for proper operation.
connect a test light to the plug on the ignition coil with it disconnected and crank the engine. if the light flashes the crank sensor is ok and you should replace the ignition coil. if it doesnt i would replace the crank sensor.
try looking at the ignition coil there is a wire there that controlls the tachometer im thinking that that wire is loose or coroded clean connection and make shure wire is clean ,there will be a clip on the coil careful to remove the correct wire one at a time as not to mix them up . before removing wires to clean get a friend to wiggle the plug attached to the ignition coil and watch the tach to see if it dirups the opperation ok good luck and please work aroun the engine with caution when its hot and running ok bye for now