Runs sluggish

2003 CHEVROLET TAHOE
226,000 MILES • 5.3L • V8 • 4WD • AUTOMATIC
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HFANARA29
  • MEMBER
  • 7 POSTS
My SUV listed above kind of putters at lights like it's going to shut off. loses power going up hills. might shut off going up hills sometimes and stalls going down highway sometimes. will CSPS be my problem?
Dec 21, 2020 at 9:09 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

Has the check engine light come on while the engine is running? Also, what you described sounds like it could be a few different things. It could be related to fuel pressure, a vacuum leak, a partially plugged catalytic converter, and the crankshaft position sensor (as you mentioned). However, a crankshaft position sensor, when going bad, will usually cause the engine to stall and require you to wait until it cools off before restarting. They are affected by heat.

Do me a favor. Take a look through this link and let me know if anything seems to mirror what you experience:

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

Also, let me know if the check engine light is staying on. If it is, I need you to have the computer scanned for diagnostic trouble codes. That will help point us in the right direction. Here is a quick video showing how it's done:

https://youtu.be/b2IJGfImVvw

I realize most people don't own a scanner, but oftentimes a parts store will do it free of charge.

Let me know and don't worry, we'll figure it out.

Take care,
Joe
Dec 22, 2020 at 11:09 AM
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HFANARA29
  • MEMBER
  • 7 POSTS
Changed crank shaft sensor, checked the PCM and fuses. it does not want to go up hill.
Dec 31, 2020 at 10:00 PM
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JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

Were you able to check the catalytic converter? Also, has fuel pressure been checked?

Is it possible for you to make a recording of how the vehicle is acting and upload it for me to hear?

Let me know.

Joe
Jan 1, 2021 at 3:49 PM
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