2000 GMC Sierra starting problems

Tiny
KECRUZ
  • MEMBER
  • 2000 GMC SIERRA
  • V8
  • 4WD
  • AUTOMATIC
  • 115,000 MILES
I have a 2000 GMC Sierra 1500 4x4 that is hard to start. It starts fine when it's cold out or the first start of the day. If I turn it off after it's been running and let it sit for a while I have to crank the starter two or three times before it starts. When it start it starts rich and black smoke comes out of the tail pipe. I have replaced the fuel pump, filter and spark plugs I''ve also had to replace the crank senser. Can you help please.
Sunday, December 23rd, 2007 AT 10:59 PM

8 Replies

Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Probably a crank sensor that is being affected by the heat. You may be able to get it to act when cold by hitting it with a hair dryer when it's cold.
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Sunday, December 23rd, 2007 AT 11:30 PM
Tiny
KECRUZ
  • MEMBER
  • 4 POSTS
I changed the crank sensor about 8 months ago. Do think it is going bad?If I let it run and turn it off and start it up within say 2 to 3 mintues it well fire right up regardless of the ambient temp. But if I let it set for 5 to 10 minutes it takes two some times three crank before it crank over regardless of ambient temp.
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Monday, December 24th, 2007 AT 12:37 AM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Straight forward, I don't know the cause. But I would try the heat like I suggested to start with. Seems like these have been a problem from my experience. It costs nothing to try. If not we go forward from there.
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Monday, December 24th, 2007 AT 1:06 AM
Tiny
KECRUZ
  • MEMBER
  • 4 POSTS
I tried the hair drier and no change. I would appreciate anyother suggestions thank you.
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Wednesday, December 26th, 2007 AT 12:22 PM
Tiny
SERVICE WRITER
  • MECHANIC
  • 9,123 POSTS
Is that a 5.3 motor? Have you checked the fuel pressure when the problem was happening? IF it is the 5.3, be aware these had a problem with the fuel pressure regulator.

Also did you change the connector at the fuel pump when you replaced the pump?
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Wednesday, December 26th, 2007 AT 6:23 PM
Tiny
KECRUZ
  • MEMBER
  • 4 POSTS
Would my check engine light come on if I had a bad sensor? And yes I do have a 5.3 in it.
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Wednesday, January 16th, 2008 AT 7:26 PM
Tiny
RSSSCA68
  • MEMBER
  • 1 POST
Mine did the same thing. I replaced the fuel pressure regulator and its fixed.
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Saturday, August 1st, 2020 AT 8:30 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,176 POSTS
Thank you for letting us know. I am sure it will help others in the future.

Take care,
Joe
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Sunday, August 2nd, 2020 AT 12:39 AM

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