1997 GMC Jimmy Motor barely turns

1997 GMC JIMMY
300,000 MILES • 4.3L • V6 • 2WD • AUTOMATIC
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ANDREWKIRK17
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  • 2 POSTS
We were replacing the fuel pressure regulator and when we installed it the motor world barely turn over then we too the Lower intake cover off to see if something had fell in there we believe that just some old engine build up fell in the pistons causing it to not turn is there something we can spray in the plug holes to break that stuff up maybe
Dec 8, 2015 at 6:00 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
there used to be a spray that went in engine while running gm and Ford dealers sold it it was the same stuff. it was decarbonizer. they probably still have it.
Dec 8, 2015 at 6:03 AM
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ANDREWKIRK17
  • MEMBER
  • 2 POSTS
I won't be able to have it running I might try some seafoam in there
Dec 8, 2015 at 6:06 AM
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HMAC300
  • ✓ASE Certified Mechanic
  • 48,601 POSTS
  • ASE Certified Mechanic
sea foam will work as well however check battery for condition including load test auto parts does for free. same with starter. check cables for corrosion and bad connections usually those are the culprits not junk in pistons. also check to see if ositive cable is hitting anything and worn through
Dec 8, 2015 at 6:29 AM
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