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

1997 Chevrolet Silverado

Tiny

bobby 97

January, 5, 2013 AT 3:10 PM

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

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8 Answers

Tiny

ASEMaster6371

January, 5, 2013 AT 3:12 PM

Timing chain? Why?

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

Roy

Tiny

bobby 97

January, 5, 2013 AT 3:22 PM

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

Tiny

ASEMaster6371

January, 5, 2013 AT 3:26 PM

What is the fuel pressure?

Roy

Tiny

bobby 97

January, 5, 2013 AT 3:37 PM

60at start 48 while cranking

Tiny

ASEMaster6371

January, 5, 2013 AT 3:41 PM

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

60 at start? I thought it did not run?

What motor?

Roy

Tiny

bobby 97

January, 5, 2013 AT 3:45 PM

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

Tiny

bobby 97

January, 5, 2013 AT 4:19 PM

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

Tiny

bobby 97

January, 5, 2013 AT 5:23 PM

What else can I try?

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