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Anonymous Posted on Feb 21, 2013

Power to red wire on coil no power to distributor wires

Motor rolls over but won,t start would bad crank sensor cause this?

1 Answer

Stephen

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  • Chevrolet Master 21,873 Answers
  • Posted on Feb 21, 2013
 Stephen
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Joined: Jun 22, 2012
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Yes the crank sensor could keep the coil from firing, but your truck does not use a crank sensor assuming its a V8.
The coil gets power from the key switch, and the ignition module inside the distributor grounds the coil to fire it.
So the problem could be the coil, or the module or pickup in the distributor. The pickup coil in the bottom of the distributor acts as a cam and crank sensor.
You may need a repair book or shop manual to get the test procedures.

  • Anonymous Feb 24, 2013

    Thank you ,repair done it was ignition module.thanks again Don Kimbler

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5 Related Answers

Anonymous

  • 23 Answers
  • Posted on Mar 03, 2009

SOURCE: no start, no spark, no signal to the coil

there is a fuse that works the battery try checking if it is still good

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Anonymous

  • 10 Answers
  • Posted on Mar 20, 2009

SOURCE: 1993 blazer 4x4

I assume you have the 4.3 vortec. If so, check to make sure you have the spark plug wires in the right position on the distributor cap. firing order is 1,2,3,4,5,6. right side of engine is 1 front 3 middle and 5 rear. Left side of engine is 2 front, 4 middle, and 6 rear. On the distributor cap # 1 should be toward front of engine and work counter clockwise from there. Hope this is helpful. KS

Anonymous

  • 149 Answers
  • Posted on Mar 23, 2009

SOURCE: 1995 lumina cranks but will not start

Sounds like it has jumped timing, dont know which engine you have so could be chain or belt.

Woody J Hiatt

  • 306 Answers
  • Posted on May 01, 2009

SOURCE: truck has no spark changed fuel pump fuel filter

Odds are it is the $20.00 ignition control module but that may be another fluke change out of parts. LOL

Anonymous

  • 8 Answers
  • Posted on Feb 13, 2010

SOURCE: 1988 chevy 3500 runs really bad!

I have the same truck I've been looking for information on a different subject. I am an ASE technician I may know what might be causing your problem. First off the white wire on the coil that goes to nothing is your test wire it's not going to be hooked up unless you are performing a test to ensure that the coil is working. Just changing parts often times does not solve the problem and it can become very expensive and make things worst for the next guy to fix. it's going to be in one of two systems Fuel or Ignition since you just did things to the ignition system I'd start looking there check the firing order needs to know what engine you have before I can give you the firing order. is this a V6? V8 5.7? what all did you replace during your tune up? it could be that one of the plugs are not gaped correctly or tightened down which could cause damage to the head requiring the valves to ground to correct the problem. Your catalytic converter may also be causing the problem one the et hot and melt they start blocking the flow of exhaust. If you would like to read more on that check out this site it has some very good information. http://www.aa1car.com/library/converter.htm

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Could be a bad coil, or a bad pickup coil inside the distributor, or worst case a bad pcm.

You said the coil is good, but didn't mention if you had tested the coil's primary and secondary circuits with an ohmmeter to see if they are within specs? And the pickup coil is like a crank position sensor: it tells the pcm crankshaft position and rpm so the computer can determine spark timing.
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Start with the ignition coil. It should have power to it with key on. Should be battery voltage on the primary circuit to the coil-that's the coil positive terminal. If the coil is good, it could be a bad ignition module-the module cuts primary current to the coil when commanded by the engine computer.
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When the engine cranks normally but won't start, you need to check ignition, fuel and compression. Ignition is easy enough to check with a spark tester or by positioning a plug wire near a good ground. No spark? The most likely causes would be a failed ignition module, distributor pickup or cranshaft position sensor CKP

A tool such as an Ignition System Simulator can speed the diagnosis by quickly telling you if the ignition module and coil are capable of producing a spark with a simulated timing input signal. If the simulated signal generates a spark, the problem is a bad distributor pickup or crankshaft position sensor. No spark would point to a bad module or coil. Measuring ignition coil primary and secondary resistance can rule out that component as the culprit.
Module problems as well as pickup problems are often caused by loose, broken or corroded wiring terminals and connectors. Older GM HEI ignition modules are notorious for this. If you are working on a distributorless ignition system with a Hall effect crankshaft position sensor, check the sensor's reference voltage (VRef) and ground. The sensor must have 5 volts or it will remain permanently off and not generate a crank signal (which should set a fault code). Measure VRef between the sensor power supply wire and ground (use the engine block for a ground, not the sensor ground circuit wire). Don't see 5 volts? Then check the sensor wiring harness for loose or corroded connectors. A poor ground connection will have the same effect on the sensor operation as a bad VRef supply. Measure the voltage drop between the sensor ground wire and the engine block. More than a 0.1 voltage drop indicates a bad ground connection. Check the sensor mounting and wiring harness.
If a Hall effect crank sensor has power and ground, the next thing to check would be its output. With nothing in the sensor window, the sensor should be "on" and read 5 volts (VRef). Measure the sensor D.C. output voltage between the sensor signal output wire and ground (use the engine block again, not the ground wire). When the engine is cranked, the sensor output should drop to zero every time the shutter blade, notch, magnetic button or gear tooth passes through the sensor. No change in voltage would indicate a bad sensor that needs to be replaced.
If the primary side of the ignition system seems to be producing a trigger signal for the coil but the voltage is not reaching the plugs, a visual inspection of the coil tower, distributor cap, rotor and plug wires should be made to identify any defects that might be preventing the spark from reaching its intended destination.


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you said you repl dist cap that means you don't have a crank sensor you have electronic ing module. remove your elec ing module have it tested most auto parts stores could test your module, or check your coil at the neg terminal. should have power. if not you lost your primary volt from your batt.your secondary power is coming from your electronic ing module from the module to the pos terminal on the coil, when the eng cranks,from the coil to the dist cap , from the dist cap center to the rotor then out to the plugs,this all happen pervided the timing belt or timing chain is ok. the cumbustion chainber needs 3 things , thats fuel, air, and spark.
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ENGINE CRANKS BUT WILL NOT START
When the engine cranks normally but won't start, you need to check ignition, fuel and"http://www.aa1car.com/library/compression.htm". Ignition is easy enough to check with a spark tester or by positioning a plug wire near a good ground. No spark? The most likely causes would be a failed ignition module, distributor pickup or "http://www.aa1car.com/library/crank_sensors.htm".
A tool such as an Ignition System Simulator can speed the diagnosis by quickly telling you if the ignition module and coil are capable of producing a spark with a simulated timing input signal. If the simulated signal generates a spark, the problem is a bad distributor pickup or crankshaft position sensor. No spark would point to a bad module or coil. Measuring ignition coil primary and secondary resistance can rule out that component as the culprit.
Module problems as well as pickup problems are often caused by loose, broken or corroded wiring terminals and connectors. Older HEI ignition modules are notorious for this. If you are working on a distributorless ignition system with a Hall effect crankshaft position sensor, check the sensor's reference voltage (VRef) and ground. The sensor must have 5 volts or it will remain permanently off and not generate a crank signal (which should set a fault code). Measure VRef between the sensor power supply wire and ground (use the engine block for a ground, not the sensor ground circuit wire). Don't see 5 volts? Then check the sensor wiring harness for loose or corroded connectors. A poor ground connection will have the same effect on the sensor operation as a bad VRef supply. Measure the voltage drop between the sensor ground wire and the engine block. More than a 0.1 voltage drop indicates a bad ground connection. Check the sensor mounting and wiring harness.
If a Hall effect crank sensor has power and ground, the next thing to check would be its output. With nothing in the sensor window, the sensor should be "on" and read 5 volts (VRef). Measure the sensor D.C. output voltage between the sensor signal output wire and ground (use the engine block again, not the ground wire). When the engine is cranked, the sensor output should drop to zero every time the shutter blade, notch, magnetic button or gear tooth passes through the sensor. No change in voltage would indicate a bad sensor that needs to be replaced.
If the primary side of the ignition system seems to be producing a trigger signal for the coil but the voltage is not reaching the plugs, a visual inspection of the coil tower, distributor cap, rotor and plug wires should be made to identify any defects that might be preventing the spark from reaching its intended destination.----
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