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karrs2fix
karrs2fix, ASE Certified Technician
Category: Ford
Satisfied Customers: 893
Experience:  ase master technician,L1 certified, Iatn sponser, tech net training
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2003 ford ranger: idles rough..highway speed..cyl..no. 3 misfire.

Resolved Question:

2003 ford ranger 3.0 v6 . Engine idles rough seems to run smooth at highway speed.Replaced plugs and wires seemed to help for a while but didnt cure problem.Had it checked mechanic said he got code po303 cyl. no. 3 misfire.
Submitted: 6 years ago.
Category: Ford
Expert:  karrs2fix replied 6 years ago.
do you have the ability to pull codes or monitor fuel trim data in the computer system..?? Fuel system lean codes specifically?
Customer: replied 6 years ago.
Dont know if my mechanic can monitor fuel trim data or not.Think he can pull codes.
Expert:  karrs2fix replied 6 years ago.
If you are only experiencing the misfire at idle you need to look into vacuum leaks as that is when the vacuum is the highest in the intake manifold. If none are found you will need to do some more testing with the fuel injection system and ignition system to see what is causing the misfire.
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