No pulse at injector
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No pulse at injector
Hi guys, I have a 2006 F150 with the 5.4L engine. I am not getting a steady ground pulse on cylinders 2&3. With a noid light plugged into the connector and the engine running, the light will blink for a few seconds then stop. Leave it running for a little while it will start blinking again, then after a few seconds, it will stop again. I have no idea how to deal with this problem. Also the display on the dash for the odometer and low fuel light only works intermittently also. That may be a clue. Thanks in advance.
Fleet Owner
Joined: Apr 2008
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With the engine running wiggle the wiring harness that holds the wiring running to the injector. Start at the injector and work your way back to the ECM. If the wiggling changes the noid blink pattern in any way then you have a loose connection. If the patterned doesn't change then the ECM is likely going bad. Use a wood dowel to wiggle the wires near any dangerous areas, you don't want to get burnt or lose a finger.
Fleet Mechanic
Joined: Feb 2011
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From: Thousand Oaks, CA
... I am not getting a steady ground pulse on cylinders 2&3. With a noid light plugged into the connector and the engine running, the light will blink for a few seconds then stop. Leave it running for a little while it will start blinking again, then after a few seconds, it will stop again. ....
The noid being intermittent may be lack of 12v or ground not completing the circuit in the PCM.
Check for 12v on both wires at the injector.
The 12v should be present whenever the PCM has power if it hasn't been changed since my 2003 wiring diagrams.
If you have good power thru the injector the ground in the PCM is not completing the circuit which may be a bad wire, loose/corroded connector pin, bad transistor in the PCM or bad ground at the PCM.
Are you getting misfires on that cylinder in the data?
There may be misfires, but not enough to set a code.
The dash displays are driven by data from the PCM, so again, a flaky ground connection may be involved.
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