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Intermittent starting

Tiny
CFRALEY
  • MEMBER
  • 1997 CHEVROLET TRUCK
  • 5.7L
  • V8
  • 4WD
  • AUTOMATIC
  • 140,000 MILES
Engine will only start and run with number one plug removed.
Monday, April 3rd, 2017 AT 8:48 AM

4 Replies

Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
Scan and see if you can come up with a security system problem then check fuses under hood with a test light. Is there a misfire or any codes?
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Monday, April 3rd, 2017 AT 10:15 AM
Tiny
CFRALEY
  • MEMBER
  • 2 POSTS
Original post' the engine will start and run as long as the number one spark plug is out of the engine.
It will not start with the plug in it.
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Monday, April 3rd, 2017 AT 11:31 AM
Tiny
HMAC300
  • MECHANIC
  • 48,601 POSTS
I know what the question was re read my first reply check fuel pressure with a gauge should be 60-66 psi if lower will not run/start. see link.
https://www.2carpros.com/articles/how-to-check-fuel-system-pressure-and-regulator
Also, check distributor cap for cracks. if you take out number it may be cracked at that position and letting it run.
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Monday, April 3rd, 2017 AT 12:07 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,481 POSTS
What does it do with #1 installed? Not turn over? Turns over but kicks back? Are you getting anything out of #1 with the plug out, like water or a lot of fuel?
Run a comparative compression test and see if your getting the same pressures in all cylinders.
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Friday, April 7th, 2017 AT 10:09 PM

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