Hour later very hard to start

Tiny
DRIVEWAYTECH
  • MEMBER
  • 1987 GMC SUBURBAN
  • 260,000 MILES
87 gmc 454 new plugs, wires, cap and rotor. Started fine, idled smooth. Hour later very hard to start. Noticed green wire broken off sensor between two plugs(o2 sensor?) Is this the problem?

no codes showing, fuel pump is functional, not sure of pressure, runs well once started.
Saturday, February 11th, 2012 AT 11:29 PM

4 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check the fuel pressure if its within specs
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Saturday, February 11th, 2012 AT 11:30 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
What about the green wire missed that one-
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Saturday, February 11th, 2012 AT 11:37 PM
Tiny
CADIEMAN
  • MECHANIC
  • 3,544 POSTS
If it runs great. Then u get a draging start. Youll need to check if a heat shield is missing or the timing maybe to far advanced. Make sure your battery passes a load test and connections are good.
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Sunday, February 12th, 2012 AT 12:03 AM
Tiny
CCUPDAVE
  • MEMBER
  • 61 POSTS
That Wire sounds like it might be either a knock sensor lead or maybe the temp. Sensor.
Good luck
Dave
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Monday, February 20th, 2012 AT 5:59 PM

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