Stops soon after start

Tiny
ROB LUNSF
  • MEMBER
  • 1999 CHEVROLET TAHOE
  • 5.0L
  • V8
  • FWD
  • AUTOMATIC
  • 150,000 MILES
Car starts, shuts off, low gas to motor, new filter.
codes po171, po174, po420, po430,
where to go from here?
Saturday, August 12th, 2017 AT 11:43 AM

1 Reply

Tiny
STEVE W.
  • MECHANIC
  • 13,452 POSTS
What is the fuel pressure reading with the engine off?
Engine running?
What does the pressure do if you snap the throttle?
Check it over for vacuum leaks. Don't forget the brake booster.
What do the fuel trims show?
What do the O2 sensors read, both upstream and downstream?
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Monday, August 14th, 2017 AT 3:11 PM

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