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2001 Chevrolet S-10 hard starting

Tiny
UK4KEV
  • MEMBER
  • 2001 CHEVROLET S-10
  • 147,000 MILES
Hard starting after it sits 10 or 15 min. After driving it. I put a new fuel pump, plugs &wires, cap & rotor, ignition coil, new ignition module, new vaccum lines checked fuel pressure 60psi when key is turn on . And drops to 55psi after started. So good pressure.
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Tuesday, June 18th, 2013 AT 10:03 AM

3 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
If it's a 4.3L it should be 60-66psi while idling then shut truck off and leave gauge connected it should not drop more than 5 psi after 10 minutes.
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Tuesday, June 18th, 2013 AT 10:57 AM
Tiny
UK4KEV
  • MEMBER
  • 5 POSTS
Put fuel pressure gauge and turned key on and got 59psi after a hour it drop to 45psi went to turn key on and psi didn't go back up it stayed at 45psi. So I repeated the samething and the psi went up this time. So I have a bad fuel pump your ignition switch. P.S. The wires on the fuel pump have good connection.
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Tuesday, June 18th, 2013 AT 5:37 PM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
First what engine then go from there if it is a 4.3 you need to check the fuel pressure regulator it is under the top part of manifold. Sounds like that is bad
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Wednesday, June 19th, 2013 AT 5:35 AM

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