Engine cranks very slow?

Tiny
FREDDFITZZ
  • MEMBER
  • 2007 CHEVROLET TRAILBLAZER
  • 4.2L
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 179,899 MILES
My engine cranks very slow will not start new battery new starter
Saturday, February 28th, 2026 AT 10:53 AM

1 Reply

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 55,481 POSTS
So what I would do first is try to bar the engine over with the spark plugs out, it should have a fair amount of resistance, if you cannot rotate the engine over there is internal damage to the engine. Also, check the positive battery cable and the ground to the engine, these must be in good shape for the engine to crank over strong enough to start. Please use this video to help.

https://www.youtube.com/watch?v=oN42gZN6gOE

Please upload a short video in your response of the problem, so I can see what's going on. Ken
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Sunday, March 1st, 2026 AT 11:37 AM

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