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Rough idle and its killing my paycheck with gas bill

Tiny
BIGB50MM
  • MEMBER
  • 1998 GMC C1500
  • 18,800 MILES
I have a 98 5.7 vortec it has rough idle mostly when ur at a redlight in drive blows out black smoke when u get on it strong running rich smell
Monday, June 25th, 2012 AT 12:13 AM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
-Possibilities for running too rich:

1. Excessive fuel pressure can be cause by restricted fuel return line

2. Defective Oxygen Sensors.

3. Leaking injectors and fuel pressure regulator.

4. Coolant temperature sensor out of calibration.

5. Restricted air intake system.
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Monday, June 25th, 2012 AT 12:32 AM
Tiny
BIGB50MM
  • MEMBER
  • 2 POSTS
Wow ok a mechanic changed the head gaskets because one blew the heads wete checked and there not cracked it never did it until they fixed the gasket
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Monday, June 25th, 2012 AT 12:44 AM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Might want to refer to this link for more information: https://www.2carpros.com/articles/engine-black-smoke
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Wednesday, June 27th, 2012 AT 1:09 AM

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