GMT 800 & Older GM General Discussion 2006 & Older Trucks | General Discussion

I need help,cant get truck to start, no spark

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Old Feb 8, 2009 | 09:09 PM
  #21  
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pick up a 4.8 real cheap and swap it, because you might have to get a new computer or something anyways.
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Old Feb 8, 2009 | 09:13 PM
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Originally Posted by 00ChevyScott
pick up a 4.8 real cheap and swap it, because you might have to get a new computer or something anyways.
Your right, I should spend $4000 instead of $60 for a comp.
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Old Feb 8, 2009 | 09:19 PM
  #23  
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Originally Posted by A Low Dime
Your right, I should spend $4000 instead of $60 for a comp.
4.8 - $300 for longblock
Harness - I've got one for a DBW truck that you can have for free
Tuned ECM + core - 500
Various other **** - 900 (mounts, gauges, cluster (if needed), etc...)
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Old Feb 8, 2009 | 09:22 PM
  #24  
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Originally Posted by 00ChevyScott
4.8 - $300 for longblock
Harness - I've got one for a DBW truck that you can have for free
Tuned ECM + core - 500
Various other **** - 900 (mounts, gauges, cluster (if needed), etc...)
hahaha You need more learning grasshoppa...
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Old Feb 9, 2009 | 09:28 PM
  #25  
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Bought a volt meter and test the wires at the ignition module and coil. They are getting 11.9 volts, they should be getting less than 4.5 volts. I traced both the wires getting too much voltage and they go into the fuse panel under the hood. Any ideas how those two wires are getting that much voltage? What would make them change voltage like that?
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Old Feb 9, 2009 | 09:36 PM
  #26  
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how do you know they should get 4.5v?
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Old Feb 9, 2009 | 09:37 PM
  #27  
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Originally Posted by BlackGMC
how do you know they should get 4.5v?
With five other links saying it.....

DTC P1351 Ignition Coil Control Circuit High Voltage

Circuit Description
The enhanced ignition system uses the crank sensor in order to provide the timing input to the VCM. The VCM uses this reference pulse in order to determine the individual ignition spark timing for each cylinder.

Once the VCM calculates the ignition timing, the ignition coil module on the IC circuit receives the timing signal. Each timing pulse received by the ignition coil module on the IC circuit triggers the coil module in order to operate the ignition coil. The secondary ignition voltage is induced, and then the secondary ignition voltage is sent to the distributor for distribution to each spark plug. This DTC is a type A DTC.

The IC signal voltage ranges from about 0.5 volt to 4.5 volts.

Conditions for Setting the DTC
EST enabled, and the engine speed is less than 250 RPM.
Diagnostic Aids
A poor connection, a rubbed through wire in the insulation, or a wire broken inside the insulation will cause an intermittent.

Check for the following conditions:

Poor connection
Damaged harness: Inspect the VCM harness connectors for the following conditions:
Backed out terminal C3 pin 9
Improper mating
Broken locks
Improperly formed or damaged terminals
A poor terminal to wire connection and
Damage to the harness.
Intermittent test - If the connections and the harness check OK, monitor a digital voltmeter connected between VCM connector 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.
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