THE ENGINE TRUNS BOUT ONLY HITS WHEN LETTING OFF...

  • Tiny
  • bobby 97
  • 1997 Chevrolet Silverado
  • 221 miles

The engine truns bout only hits when letting off start just aquick back fire what could this be? I have changsd the following parts[timeing chain/gears -coil -ingetion pickupcoil dist cap-wires-rotor plugs crank sensior ingnitonswitch. Still just the same. Please can you help

Saturday, January 5th, 2013 AT 3:10 PM

8 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

Timing chain? Why?

Check for fuel pressure. Check spark and check compression. Lets start at basics first

Roy

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Saturday, January 5th, 2013 AT 3:12 PM
  • Tiny
  • bobby 97
  • Member

Thought might have jumped time but didnt help spark is good fuel is good compression good

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Saturday, January 5th, 2013 AT 3:22 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

What is the fuel pressure?

Roy

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Saturday, January 5th, 2013 AT 3:26 PM
  • Tiny
  • bobby 97
  • Member

60at start 48 while cranking

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Saturday, January 5th, 2013 AT 3:37 PM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

48 cranking is too low. Needs to be 60-65

60 at start? I thought it did not run?

What motor?

Roy

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Saturday, January 5th, 2013 AT 3:41 PM
  • Tiny
  • bobby 97
  • Member

60 at srart of pump turn on / 48 while trying to start 4.3 engine

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Saturday, January 5th, 2013 AT 3:45 PM
  • Tiny
  • bobby 97
  • Member

60 psi when cranking and then a loud back fire but want start and run

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Saturday, January 5th, 2013 AT 4:19 PM
  • Tiny
  • bobby 97
  • Member

What else can I try?

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Saturday, January 5th, 2013 AT 5:23 PM

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