1999 Ford Explorer Clunk going down the road

AFD91

MEMBER
1999 FORD EXPLORER
6 CYL
4WD
AUTOMATIC
133,000 MILES

I have a clunk going down the road, I thought it might be the transmission but am not sure. It does it going up hills and frequently on flat roads but it doesn't seem like it happens just when shifting. I got under the vehecles and tried to wiggle the drive shaft to see if the universal joints wiggled but they didn't. Any ideas out there?

Saturday, January 16th, 2010 AT 1:38 PM

1 Reply

RASMATAZ

MECHANIC
75,992 POSTS

Check and test the following below:

Oygen Sensor
Catalytic Converter
Dirty fuel injectors (cleaning the injectors often fixes this).
Bad MAP (manifold absolute pressure) sensor
Bad TPS (throttle position) sensor
Bad or dirty MAF (mass airflow) sensor
Low fuel pressure (leaky fuel pressure regulator or weak fuel pump)
Vacuum leaks (intake manifold, vacuum hoses, throttle body, EGR valve)
Bad gasoline (fuel contaminated with water or too much alcohol)

Sometimes, what feels like a hesitation is actually ignition misfire rather than lean misfire. The causes of ignition misfire may include:

Dirty or worn spark plugs
Bad plug wires
Weak ignition coil
Wet plug wires
Cap and Rotor

Note:If it doesn't apply, disregard.

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Saturday, January 16th, 2010 AT 3:03 PM