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Vehicle shut off while driving and now it will not start?

Tiny
BNICOLE.2019
  • MEMBER
  • 2004 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 300,000 MILES
Could it be the crank shaft? My vehicle is cranking but won't start. The spark plugs have no spark to them when I try to start it, I replaced the wires from the ignition coil to the spark plug thinking it may have been a connection between them. I just got the vehicle, not sure what all work has been done just don't know where to start with fixing it.
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Saturday, August 26th, 2023 AT 9:40 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,269 POSTS
Hi,

Oftentimes, it is related to a failed crankshaft position sensor (CKP) when spark is lost. If you have a live data scanner, see if there is an RPM signal when cranking it. If you don't have one, see if the tachometer moves a little when cranking.

Also, take a look through this link. See if anything mirrors what you are experiencing.

https://www.2carpros.com/articles/symptoms-of-a-bad-crankshaft-sensor

On this vehicle, the CKP is located behind the starter motor, so you will need to remove it if you replace it. If you look below, I attached the directions for replacing it.

Let me know what you find or if you have questions,

Take care,

Joe

See pics below. Note: The last three pics are the variation relearn procedures.
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Saturday, August 26th, 2023 AT 10:38 PM

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