Crank no start?

2002 CHEVROLET TAHOE
274,863 MILES • 5.3L • V8 • 4WD • AUTOMATIC
Avatar
WHODIEUDONEFUGGEDUP
  • MEMBER
  • 2 POSTS
I recently had to change my transmission, fuel pump, plugs, wires, and ignition coils…my vehicle will attempt to start but won’t start. An unlicensed backyard guy said that he thinks I’m not getting a spark, but doing some research online is leading me to believe that the crankshaft position sensor is bad. Any suggestions?
Dec 8, 2022 at 7:52 AM
Advertisement
Avatar
JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

If the crankshaft position sensor has failed, you won't have spark to the plugs. So, try this.

See if the engine starts for a couple of seconds using starting fluid. If it does and then stalls, we know its fuel related. If there is no change, then suspect spark.

Here is a link that explains how to check for spark to the plugs. Do this if needed.

https://www.2carpros.com/articles/how-to-check-for-ignition-spark

Also, here is a link that describes the most common symptoms of a failing crankshaft position sensor. Take a look through it and let me know if you feel it mirrors what you are experiencing.

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

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

Joe

See pics below.
Dec 8, 2022 at 1:11 PM
Avatar
WHODIEUDONEFUGGEDUP
  • MEMBER
  • 2 POSTS
Crank but no start; new ignition coils, plugs, wires, and fuel pump. took to get check engine light fixed and got code p0308 misfire cylinder 8. would this be a combination of EGR valve, crankshaft sensor, and PCM? not getting any kind of spark other but plugs, coils, and wires are fine. The fuel pump relay tested and that is fine. cylinder 8 is the issue. please help!
Dec 11, 2022 at 4:27 AM (Merged)
Avatar
JACOBANDNICKOLAS
  • Experienced Mechanic
  • 110,240 POSTS
Hi,

If it was an EGR leak, it wouldn't be limited to only a cylinder 8 issue. You would likely have a multiple-cylinder misfire. Is it only a cylinder 8 issue? If it is, the engine should still run but would have a misfire. Is it starting at all now?

If you have no spark to any of the spark plugs, then my first suspect would be a crankshaft position sensor. That is where I would start.

Let me know me know your thoughts.

Joe
Dec 11, 2022 at 5:05 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.