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po304 and po316

Eastcoastmod

Active Member
Joined
October 20, 2010
Messages
86
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0
City, State
Halifax,
Year, Model & Trim Level
2003 Explorer Limited 4.6
HI all

I'm getting the following codes po304 and 316
2003 ex 4.6 limited

symptoms
low idle misfire, worse when it warms up
idling around 500-600
stalls when coming to a stop
give it gas and all is good pulls hard

so far

new plugs
new coils
new iac valve....factory ford part
cleaned MAF sensor
checked all vacuum lines
seafoamed, standard brake booster vacuum line suck in, no change

I've read that it could be the crank position sensor...wouldn't that give me rough running through all rmp ranges?
Is the po304 a misfire in cyl 4?

Any help is appreciated. It's hot out, looking for a quick solution.

Colin
 






rocco123

Well-Known Member
Joined
February 24, 2002
Messages
877
Reaction score
11
City, State
Endicott, NY
Year, Model & Trim Level
1994 XLT & 2002 Limited
Yea 304 is cyl 4. Passenger side 4th back. Check compression yet? Yes could be crank sensor.
 






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