2005 GMC Envoy car still has a miss

Tiny
ROGERLHOWE
  • MEMBER
  • 2005 GMC ENVOY
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 150,000 MILES
I can now start it and it will idle butit misses. I pulled 1 coil unit off at a time but can't isolate it. How can I find out which cyl is missing. Is there a test I can do. Please help me. I worked on cars all my life. New cars?

thanks


Roger

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Tuesday, August 19th, 2014 AT 3:17 PM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
A scanner will give a code which one it is 301 is cyl 1 302 cyl 2 and so no autoparts do for free
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Tuesday, August 19th, 2014 AT 3:51 PM
Tiny
ROGERLHOWE
  • MEMBER
  • 2 POSTS
The scanner says crankshaft sensor bad will that make it miss?
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Wednesday, August 27th, 2014 AT 6:10 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
It can because it doesn't send the correct signal to ignition box which then tells coils to fire
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Wednesday, August 27th, 2014 AT 6:13 AM

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