Mechanics

ALL CYLINDERS MISFIRING - OTHER TROUBLE

2003 Ford Explorer

2003 Ford Explorer 6 cyl Front Wheel Drive Automatic 122000 miles

I have a 2003 Ford Explorer, Flex Fuel. A few days ago I started the car and there was a brief fairly loud noise from the engine compartment area (maybe a pop), possibly followed by a one second or so alternator belt slipping type of sound. Sorry I can't be more descriptive, the noise caught me totally by surprise and I wasn't paying attention. I have started the car a few times since then and the noise hasn't repeated. The car idles and runs rough. I then noticed the Service Engine Soon light is on, I don't know how long it has been on.

I noticed a small rubber V shaped (about 1 1/2 inches long on each side of the V) hose (?) On the pavement near where the engine had been. I don't know if this could have come off the car.

Here are the trouble codes that came up, in order read by OBDII scanner:

P0300 - random/multiple cylinder misfire detected
P0301 - cylinder 1 misfire detected
P0303 - cylinder 3 misfire detected
P0316 - misfire deteced first 1000 revs
P2195 - O2 censor stuck lean (bank 1 censor 1)
P2197 - O2 censor stuck lean (bank 2 censor 1)
P0302 - cylinder 2 misfire detected (pending)
P0304 - cylinder 4 misfire detected (pending)
P0305 - cylinder 5 misfire detected (pending)
P0306 - cylinder 6 misfire detected (pending)

I don't think changing the spark plugs or wires will fix the problem. Maybe the ignition coil has gone bad?

A friend suggested disconnecting the battery for an hour so the computer will reset.

Any assistance is greatly appreciated.
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FordExplorer2003Flex
September 11, 2008.



Vacuum leaks
I would be looking and checking for vacuum leaks
check intake manifold gasket
MAF sensor

BMRFIXIT
Sep 11, 2008.
Misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.

Rasmataz
Sep 11, 2008.