Okay......sorry for the delay.........minor technical difficulties.........let's get going here.
I need you to answer a couple of questions so we can get on the same page.
Misfire Definition: A misfiring cylinder is lacking power relative to the other cylinders. The causes for a cylinder specific misfire could be fuel, spark, or mechanical problems
Please do a compression check and let me know what it is for each cylinder. This will hopefully rule out mechanical problems.
The indicated compression pressures are considered within specification if the lowest reading cylinder is within 75 percent of the highest reading. Refer to the Compression Pressure Limit Chart.
First, did you replace the items because you were getting the misfire code?
How did you read the code?????
When you replaced the plugs......how did #4 look compared to the others?
What spark plugs did you use to replace the plugs???????? Did you use MOTORCRAFT Part # AWSF32P
You replaced "just" that coil on number 4?
I know you replaced that injector.....Did you check the injector wire for a pulse? You can do the loan/buy back for a tester at Auto Zone. It is important we find out if you are getting a pulse to that injector.
Did you recently run out of gas?
I attached the troubleshooting chart for a misfire for your review.
Last, when you say the battery and alternator are okay.....did you have them tested?
Okay......sorry about the delay...........let me know the above.
Wednesday, December 17th, 2008 AT 7:46 PM