2000 GMC Sierra no spark

2000 GMC SIERRA
Avatar
GMCGMC1
  • MEMBER
  • 2 POSTS
2000 GMC Sierra V8 Two Wheel Drive 203000 miles

I have 2000 gmc with a 5.3 ltr that has no spark. It had a p0335 crank sensor code and i changed the sensor and cleared the code but still no spark
Feb 21, 2009 at 12:44 PM
Advertisement
Avatar
JDL
  • CERTIFIED EXPERT
  • 16,098 POSTS
Hello, have you tried unpluging the cam sensor then try starting?

Can you check the circuits at the crank sensor? Lite green is ignition feed, dark blue with white stripe is signal, yellow with black stripe- ground.
Feb 21, 2009 at 1:07 PM
Avatar
GMCGMC1
  • MEMBER
  • 2 POSTS
tried to disconnect the cam sensor and its the same thing. Sometimes when i turn it over it acts like it wants to start then nothing. Maybe fuel pressure but when i put a spark tester on it shows nothing so im not sure whats going on. With the scanner connected it says check ingine light is off but im looking at it and it is on so what does that mean? Major electrical issue?
Feb 21, 2009 at 5:26 PM
Advertisement
Avatar
JDL
  • CERTIFIED EXPERT
  • 16,098 POSTS
If your scanner shows live engine data, you can crank it and look for rpm signal?

Have a helper crank it, check for injector pulse, you might be able to feel the injector vibrate, or hear it click.

Did you check the crank sensor circuits?
Feb 22, 2009 at 10:46 AM