1996 GMC Sierra Upper intake gasket replaced.

Tiny
DAZEDNCONCFUSED
  • MEMBER
  • 1996 GMC SIERRA
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 205,150 MILES
I replaced my upper intake gasket. Now when I try to start it, the starter does its job, but the crankshaft will not budge. The truck has been sitting for a week. Also when I stop trying to start it, gas comes out somewhere from the bottom end. Help!
Monday, May 18th, 2015 AT 8:35 AM

5 Replies

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 109,758 POSTS
Is one of the cylinders filling with fuel? If you remove the spark plugs, will the crank turn then?
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Monday, May 18th, 2015 AT 8:48 AM
Tiny
DAZEDNCONCFUSED
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  • 4 POSTS
Haven't thought about that. Will let you know shortly.
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Monday, May 18th, 2015 AT 8:54 AM
Tiny
DAZEDNCONCFUSED
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  • 4 POSTS
Cylinders 1, 4, and 5 had fuel covered plugs, crankshaft still won't do anything.
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Monday, May 18th, 2015 AT 9:13 AM
Tiny
DAZEDNCONCFUSED
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Okay, took a torque wrench to the crank. It moved and shot out about a half cup of fuel from cylinder 6.
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Monday, May 18th, 2015 AT 11:37 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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That was the problem. It caused hydrostatic lock. Either the injector is stuck and dumping fuel, or the regulator is not restricting the fuel pressure.
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Wednesday, May 20th, 2015 AT 8:51 AM

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