The engine truns bout only hits when letting off.

Tiny
BOBBY 97
  • MEMBER
  • 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 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 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
  • 6 POSTS
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
  • MECHANIC
  • 52,796 POSTS
What is the fuel pressure?

Roy
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Saturday, January 5th, 2013 AT 3:26 PM
Tiny
BOBBY 97
  • MEMBER
  • 6 POSTS
60at start 48 while cranking
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Saturday, January 5th, 2013 AT 3:37 PM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,796 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
  • 6 POSTS
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
  • 6 POSTS
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
  • 6 POSTS
What else can I try?
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Saturday, January 5th, 2013 AT 5:23 PM

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