Mechanics

NEED HELP!

1994 Ford Explorer • 6 cylinder 4WD Automatic • 300,000 miles

1994 ford explorer. Idles rough and there is black smoke from tailpipe.
Please help
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Carolleblanc
August 16, 2011.




Sounds like its running too rich

Probable causes of an engine running rich are as follows: 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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Tiny
Rasmataz
Aug 16, 2011.
Truck starts fine but when I step on the gas it hesitates like it's not getting enough fuel. Have changed all sensors except o2. Still have black smoke coming from tailpipe so will check the above. Could this be a fuel pump problem?

Tiny
Carolleblanc
Aug 16, 2011.
Check the fuel pressure with a gauge if its within specs-Injector/s and fuel pressure regulator could be leaking-investigate

Tiny
Rasmataz
Aug 16, 2011.

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