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OK I am about to blow my car up!! It intermittently won't start...I have changed: Fuel filter, ignition control module, starter, battery, battery terminals, distributor cap, rotor button, plugs, and wires. There are no idiot lights and no codes. Sometimes when its hot, sometimes when it is cold, and twice while i was driving it cut off and would not start. Sometimes it takes 2 minutes to restart sometimes up to 2 hours....what the frig can it be? Please someone help this is becoming a huge problem since I drive for a living and rely on my car for my income!!!!
No I haven't....someone said something about a sensor on the transmission??? Do you know anything about that?No I haven't....someone said something about a sensor on the transmission??? Do you know anything about that?
No I haven't....someone said something about a sensor on the transmission??? Do you know anything about that?No I haven't....someone said something about a sensor on the transmission??? Do you know anything about that?
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DTC P1351 Ignition Coil Control Circuit High Voltage
The enhanced ignition system uses the crankshaft position (CKP) sensor in order to provide a timing input to the control module. Ignition control (IC) spark timing for each cylinder is based on this input. The control module provides the ignition timing signal to the ignition control module (ICM) to control the ignition coil. Each timing pulse detected by the ICM allows it to energize the ignition coil. A large secondary ignition voltage is induced in the secondary coil by the primary coil. This high voltage is switched to the correct spark plug by the distributor.
This diagnostic trouble code (DTC) will set if the VCM- (vehicle control module ) detects an unusually high voltage on the ignition timing signal circuit.
Diagnostic Aids
Intermittent test -- If the connections and the harness check OK, monitor a digital voltmeter connected between VCM terminal C3 pin 9 and C4 pin 18 while moving related connectors and wiring harness. If the failure is induced, the voltage reading will change. This may help to isolate the location of the malfunction.
An intermittent may be caused by any of the following conditions:
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A poor connection
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Rubbed through wire insulation
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A broken wire inside the insulation
Thoroughly check any circuitry that is suspected of causing the intermittent complaint. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.
If a repair is necessary, refer to Wiring Repairs or Connector Repairs in Wiring Systems.
Check out this guy's video on GM fuel pump electrical circuit diagnosis !
You may be having an intermittent failure with the fuel pressure regulator - checking the fuel pressure when the truck won't start may pinpoint this problem. If the pressure looks OK, this same problem can be caused by the ignition system as well (ignition coil or control module).
Was there only one ignition coil to be replaced or did you replace all of them? How do you know its due to intermittent spark and not a fuel delivery issue? The ignition control module is a good next step if you have changed all of the coils and confirmed it is not a fuel issue.
The idle circuit on the KE and KF Laser carby engines is controlled by the ignition module inside the distributor. The symptoms are intermittent stalling. There are also windings inside the distibutor that should be replaced at the same time as the module because these can short out the module.
The crankshaft position sensor identifies position of the crankshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown.
The camshaft position sensor identifies position of the camshaft to the ignition control module (ICM), engine control module (ECM) or powertrain control module (PCM)
When not replaced, vehicle could experience no- or hard start, long crank time, misfire, lack of power, excessive hydrocarbons in oil, spark plug fouling, catalytic converter failure, poor fuel economy, CEL/MIL illumination or intermittent shutdown
First, try swapping the eec relay with a known good unit and see if the problem persists.
Second, you could be experiencing a problem with your ignition module overheating, causing high resistance in the circuit. When the vehicle sits for a while, the circuit cools and will allow the current to flow again.
No I haven't....someone said something about a sensor on the transmission??? Do you know anything about that?
No I haven't....someone said something about a sensor on the transmission??? Do you know anything about that?
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