1998 Ford Crown Victoria MISFIRE ON CYLINDER 4

Hello -

To better assist you please let me know your model, is it just a Crown Vic or an LX. Also, please tell me the engine size in liter and the 8th digit of your VIN.

To save time, please go to Auto Zone (AZ) or O'Reilly's (OR) and for FREE they can pull the codes to the car. Most important: Once they check your codes, if they find something and you don't get it fixed and need to get back with us, please make sure you tell us exactly what the code was, number and all. Example, if the code was E0568 O2 Sensor bad. Then make sure you give us all of that. While there for FREE also they can bring their tester out and check your battery and alternator.

Hello -

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.

TEST RESULTS
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.