Question about GMC Sierra 2500

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2001 gmc sierra 6.0L No spark. changed crankshaft sensor. if there is no voltage to coils, is that a bad ground somewhere.. possibly the wire that goes to cks sensor. also changed ecm and relearned the security to. any ideas?

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Hi,


The GMC Sierra has an alternator that sends electrical current to various devices in the vehicle while the engine is running. Most alternators made today include a voltage regulator that ensures the voltage level remains constant. You may need to replace the alternator if your battery keeps running down or your headlights become dimmer while driving.
http://www.ehow.com/how_4506226_replace-alternator-gmc-sierra.html
I would recomend to have the alternator replaced .
Let us know if you want something else please accept the solution.
Thank You for contacting fixya.com

Posted on Apr 26, 2010

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Posted on Jan 02, 2017

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see this steps and fix it. God bless you
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

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I have a 2002 ford taurus SE, coil pack has been replaced because Advanced Auto ran a diagnostic and said my coil pack was bad. Well its not and im still not getting fire on #3 and #4 spark plugs. changed...


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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.
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thanks for using fixya,please do rate the solution positively.

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