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2000 Chevy Astro MISFIRES WHEN TURNING ENGINE OVER

Tiny
MCARVER
  • MEMBER
  • 2000 CHEVROLET ASTRO
  • 6 CYL
  • AWD
  • AUTOMATIC
  • 297,000 MILES
AFTER INTAKE MANIFOLD GASKETS WERE REPLACED WHICH INCLUDED REMOVING DISTRIBUTOR AND ALL ENGINE SENSOR CONNECTORS, THE ENGINE WOULD BACKFIRE THRU THE INTAKE AS IF TIMING WAS OFF. THE TIMING WAS CHECKED WITH NO 1 ON COMPRESSION STROKE AT TDC AND DRISTRIBUTOR ROTOR POINTING RIGHT AT NO 1. STILL BACKFIRED AND NO START. ANY SUGGESTIONS?
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Tuesday, December 8th, 2009 AT 2:14 PM

3 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
Where does it backfire from the intake or exhaust?
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Monday, December 21st, 2009 AT 7:38 AM
Tiny
MCARVER
  • MEMBER
  • 4 POSTS
As I stated in the forum, it would backfire thru the INTAKE and catch the excessive fuel on fire as if timing was way off. MAKING SURE no. 1 is on compression stroke and at TDC by checking with the mark on the harmonic balancer, has been repeated a dozen times.
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Monday, December 21st, 2009 AT 8:30 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,170 POSTS
The only thing I can think of is to check the crank sensor. Also, if it is firing through the intake, you could have an intake valve problem. Have you checked compression? As far as the timing, you did it right.
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Monday, December 21st, 2009 AT 8:56 AM

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