Ok so I have a 2006 f150 with the 5.4 and the other day it started running rough and had a check engine light. So I checked it and it said #4 cylinder misfire. So I went to get a ignition coil to see if it would fix it but on the way back smoke started coming through the floor board and it smelled like clutches burning up. And the check engine light was blinking so I but the code reader back on it and got on for bad air to fuel ratio and on about the ECM getting a bad reading on the cylinder #2 injector circuit then one more on system too lean (bank 2). Can anyone tell me what the heck is wrong with my truck please.

 

You need to post the exact numeric codes. How many miles on the spark plugs and coils?

 

p0202,p0304,p0174 sorry I didn’t include these and like 15,000 on the spark plugs and probably about the same or just a little more on the coils.

 

What brand plugs and coils did you use?

I recommend Motorcraft if directly possible.

 

What causes the P0202 code?

• Failing or failed cylinder 2 fuel injector
• Faulty ECM
• Open or short in the wiring harness for the cylinder 2 injector circuit
• Poor or broken electrical connection

What are the symptoms of the P0202 code?

• Check Engine Light present
• Rich or lean engine conditions causing poor gas mileage
• Lack of power and poor acceleration
• Vehicle may stutter or die while running and not restart

The malfunction causes the ECM to set a Check Engine Light and a failsafe mode. This failsafe mode is to protect the vehicle from further damage. Failsafe is enabled until normal injector operation is found or the fault is repaired.

 

they are all motorcraft

 

what do you recommend me doing or what do I need to start with

 

You need to troubleshoot the injector issue first.

How does a mechanic diagnose the P0202 code?

First, a technician will use a scanner to find out what codes are stored in the ECM. These codes will have freeze frame data associated with each code which tells the technician what the vehicle conditions were when the malfunction was detected. All codes will then be cleared and a road test of the vehicle will be done, preferably under conditions similar to when the fault was first detected.

Next, a visual inspection will be performed for the injector circuit looking for any damaged wiring, loose or broken connectors, or components with damage. After the visual inspection, the scan tool will be used to check for injector operation and voltage and resistance.

A digital multimeter will then be used to check for voltage present at the cylinder 2 fuel injector. The technician will then use a noid light installed between the injector and the wiring to test the pulse of the fuel injector.

Lastly, the ECM will be tested if the vehicle passes all other checks.