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Crank no start

Tiny
RON VERNICK
  • MEMBER
  • 2002 CHEVROLET S-10
  • 4.3L
  • 6 CYL
  • 4WD
  • 130,000 MILES
Drove truck home next morning it would crank but no start. Checked fuel pressure and it is good checked spark and it is good. Checked plugs and wires good. Sprayed starting fluid no start. Changed cam sensor changed tested crank sensor good. When I look at data with scan tool ignition advance is 00 and tachometer does not move while cranking.
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Sunday, January 14th, 2018 AT 8:28 AM

4 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,722 POSTS
Hello,

It sounds like you lost the timing chain to the engine but to be sure lets check the compression.

https://www.2carpros.com/articles/how-to-test-engine-compression

This guide can help as well.

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

Cheers, Ken

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Monday, January 15th, 2018 AT 3:17 PM
Tiny
RON VERNICK
  • MEMBER
  • 3 POSTS
I have done compression test, I have changed timing chain. I have had the upper plenum off checked every injector is spraying good spark is good. When I have scanner hooked up and crank ignition advance is 00 fuel trim is 00 rpm reads 180 or so it is as if the spark timing is off. I have read that you can have spark and fuel and still have a bad crank sensor. Is that true? Psi is 62 during crank and 58 after down to 54 after five minutes. Checked security and it is fine. I have been a tech for twenty plus years. Just stumped.
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Monday, January 15th, 2018 AT 5:35 PM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 47,722 POSTS
Can we pull the spark plugs to see what they look like all black? Can you upload a picture of the plugs?
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Tuesday, January 16th, 2018 AT 9:52 AM
Tiny
RON VERNICK
  • MEMBER
  • 3 POSTS
  • 2002 CHEVROLET S-10
  • 4.3L
  • 4WD
  • AUTOMATIC
  • 130,000 MILES
Drove home next crank no start. Checked everything fuel pressure 62 psi new cap and rotor crank and cam sensor new timing chain. Got spark and fuel. Scan tool key on engine off timing advance 00 fuel trim 00.
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Tuesday, January 16th, 2018 AT 10:45 AM (Merged)

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