Mechanics

ROUGH IDLE AND ITS KILLING MY PAYCHECK WITH GAS BILL

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
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Bigb50mm
June 25, 2012.



-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.

Rasmataz
Jun 25, 2012.
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

Tiny
Bigb50mm
Jun 25, 2012.
Might want to refer to this link for more information: http://www.2carpros.com/articles/engine-black-smoke
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Rasmataz
Jun 27, 2012.

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