Changed crank shaft sensor now will not start

Tiny
HFANARA29
  • MEMBER
  • 2003 CHEVROLET TAHOE
  • 5.3L
  • V8
  • 4WD
  • AUTOMATIC
  • 226 MILES
Drove the car changed the crankshaft positioning sensor tried to start the car and will not start.
Monday, December 21st, 2020 AT 1:42 AM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

Since the issue started when you replaced the crankshaft position sensor, the first thing I need you to check for is spark to the spark plugs. If the sensor is the issue, there won't be spark.

Here is a link that explains how to check:

https://www.2carpros.com/articles/how-to-test-an-ignition-system

Also, let me know if you have a live data scan tool. If you do, check to see if there is an RPM signal when cranking the engine.

Let me know what you find or if you have other questions.

Take care,
Joe
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Monday, December 21st, 2020 AT 8:47 PM
Tiny
HFANARA29
  • MEMBER
  • 7 POSTS
I do I put the old crank in and it works but it's running sluggish up hills. Also runs rough at lights and possibly shuts off or loses power up hills. Is that crank shaft position sensor bad?
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Tuesday, December 22nd, 2020 AT 5:12 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,700 POSTS
Hi,

Honestly, I doubt the crank sensor is causing that. Have you checked fuel pressure? Have you checked for engine vacuum leaks? Have you checked to see if there are any diagnostic trouble codes stored in the system?

What you described can be caused by a few different things. A weak fuel pump, partially plugged catalytic converter, engine vacuum leaks, faulty coolant temperature sensor and so on.

If you haven't already, check to see if there are any stored diagnostic trouble codes. Here is a quick video showing how it's done:

https://youtu.be/b2IJGfImVvw

Most parts stores will scan it free of charge, so I recommend having that done.

If you are unable to, let me know. We will need to check one thing at a time.

Let me know and don't worry, we'll figure it out together.
Joe
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Tuesday, December 22nd, 2020 AT 8:48 PM

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