why do i not have spark at plugs

2005 CHEVROLET TRAILBLAZER
134,000 MILES
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LEE1313
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  • 2 POSTS
I replaced engine on a 2005 Chevy trailblazer 4.2l i6 with one from a 2006 Chevy trailblazer the problem I'm having no spark to spark plugs used code reader no codes found what is the issue everything else works?

Jul 26, 2012 at 12:28 AM
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ASEMASTER6371
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could be a crank sensor but you need a scan tool to confirm. it will give readings on critical sensors that will provide both fuel and spark

Roy
Jul 26, 2012 at 12:32 AM
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LEE1313
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I have replaced both the cam sensor and crank sensor bought a obd code reader the code reader says that there is no failure what could the problem be
Jul 26, 2012 at 12:37 AM
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ASEMASTER6371
  • ✓ASE Certified Mechanic
  • 52,796 POSTS
  • ASE Certified Mechanic
code readers tell you nothing but a code number for a system failure. you need a real scan tool to look at live data

Roy
Jul 26, 2012 at 12:38 AM
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