2000 GMC Sierra no spark

GMCGMC1

MEMBER
2000 GMC SIERRA

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

Saturday, February 21st, 2009 AT 12:44 PM

3 Replies

JDL

MECHANIC
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.

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Saturday, February 21st, 2009 AT 1:07 PM

GMCGMC1

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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?

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Saturday, February 21st, 2009 AT 5:26 PM

JDL

MECHANIC
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?

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Sunday, February 22nd, 2009 AT 10:46 AM