MY VAN IS THE 3500 5

  • Tiny
  • 2000 express
  • 2000 Chevrolet Express
  • 140 miles

My Van is the 3500 5.7 L. Was running fine up to this issue. When I crank the van I get sporadic hesitations but will not start, battery is fully charged, I have a spark (checked with timing light) but no ignition. Replaced the cap and rotor, I found some signs of wear. Used hand held diagnostic meter, no codes everything came back OK. When I attempted start up I got a major backfire out of the intake manifold, a weird thing started with this failure. When it cranks the speedometer jumps to 30 to 40 mph. But still does not start
I have fuel pressure at rail, so I tried spraying starting fluid into the intake to check possible injector fail, got backfire out of the intake manifold, it sounds like a timing issue, does the speedometer quark relate to a major computer issue or something smaller like a possible short or a positioning sensor fail?
What should I do next?

Monday, December 31st, 2012 AT 10:15 PM

2 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Common issue is the distributor lower gear wears out and the spark for the plugs goes way off. Have someone check this for you

Roy

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Monday, December 31st, 2012 AT 11:45 PM
  • Tiny
  • 2000 express
  • Member

How much slap is normal? I have about 10 degrees of rotation and some vertical play. Would the mechanical wear to the lower gear attribute to the speedometer jumping?

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Tuesday, January 1st, 2013 AT 6:20 PM

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