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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?

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

3 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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
  • 2 POSTS
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
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
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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