No start, no spark condition

Tiny
JOE MARTINEZ2
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.7L
  • V8
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
The car wouldn't start, no spark condition. I installed a new ignition module, coil, cap, and rotor. Fuel pressure is 58 PSI and drops to about 55. After this installation of new parts it started ran perfectly even after 3 - 4 restarts. The next day it wouldn't start. I did have a misc crank sensor code on the scanner, but I cleared it on the first go round and it ran perfectly. I'm hoping it is not the crank sensor. Everything else checks out fine, not sure where to test for the crank sensor output without the vehicle running.
Thursday, May 19th, 2022 AT 12:43 PM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,057 POSTS
Hi,

It could be the crank sensor. If it is bad, you won't have spark to the plugs. If you have a live data scan tool, you can check for an RPM signal when cranking. If there isn't one, the crankshaft position sensor is the likely cause.

Take a look through this link and let me know if it mirrors what you are experiencing:

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

Also, if you find the sensor is bad, I attached the directions below for replacing it.

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

Take care,

Joe

See pics below.
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Thursday, May 19th, 2022 AT 8:16 PM

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