Why do I not have spark at plugs

Tiny
LEE1313
  • MEMBER
  • 2005 CHEVROLET TRAILBLAZER
  • 134,000 MILES
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?

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Thursday, July 26th, 2012 AT 12:28 AM

3 Replies

Tiny
ROY B
  • EXPERT
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
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Thursday, July 26th, 2012 AT 12:32 AM
Tiny
LEE1313
  • MEMBER
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
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Thursday, July 26th, 2012 AT 12:37 AM
Tiny
ROY B
  • EXPERT
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
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Thursday, July 26th, 2012 AT 12:38 AM

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