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P0300 code

Tiny
TWOREAL2005
  • MEMBER
  • 2001 CHEVROLET ASTRO
  • 4.3L
  • 6 CYL
  • RWD
  • AUTOMATIC
  • 134,000 MILES
.I have changed plugs/wires, distributor cap/rotor an coil/mod an just did fuel filter. I got a can of carburetor cleaner an sprayed the intake. The service light goes out and it stays off for a good minute. What is this fuel regulator, fuel pump? But it is running fine not missing or turning off? Help!
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Saturday, May 28th, 2016 AT 8:56 AM

1 Reply

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Check fuel pressure with a gauge auto parts rent it. if 60-66 psi it is good if not pump or regulator is bad, but probably pump. check for a vacuum leak as well. finally if it still shows a 300 code have a local professional freeze frame it so he check some voltages.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
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Saturday, May 28th, 2016 AT 9:23 AM

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