I've been a lurker here for some time but tonight I am asking for help. I have a 2005 Expy EB and have been getting a #5 misfire code only for about 2 weeks. I cant get rid of it and I have triad everything I know to do except change the fuel injectors. I have swapped the spark plug and coils fron 5 to 6 and then back. I have tried compression and fuel pressure and everything seems good. I know the phasers are ticking and that is a project for next month, but I want to get rid of this misfire first. I also checked the resistance of the 5 and 6 injectors and they seem to be close and within spec. It only happens when its cold and clears up when warm(ticking phasers). Also this truck doesn't get driven much, maybee 1000 miles or so a month so I am not sure if that helps. Getting really frusterated and I am asking for your help. I am attaching the freeze frame from my Actron scan tool as well. Thanks in advance.

Jason


Global OBDII
Non OBD Freeze Frame
Frame 1 Mod $00
MIL STATUS OFF
TROUB CODE P0305
ABSLT TPS % 21.9
ENG SPEED RPM 1673
BARO PRS KPA 103
CALC LOAD % 77.6
MAF FLOW GR/SE 42.22
OUT TEMP �F 55
COOLANT �F 100
IAT �F 73
IGN ADVANCE DE 34.5
ST FTRM1 % 0.7
LT FTRM1 % 1.5
ST FTRM2 % 9.3
LT FTRM2 % 2.3
ST FTRM3 % -100.6
LT FTRM3 % -100.6
LT FTRM4 % -100.6
ST FTRM4 % -100.6
VEH SPEED MPH 32
ABSLT LOAD % 42.0
REL FRP KPA 2.64
FUEL SYS 1 CLSD
FUEL SYS 2 N/A
REL TPS % 9.4
THROT CMD % 14.5
ABS TPS B % 32.9
ACC POS D % 22.7
ACC POS E % 32.5
ACC POS F % 21.5
CAT TEMP11 �F 1283
CAT TEMP21 �F 1283
EVAP PURGE % 35.2
EVAP VP H2O 51.658
CMD EQ RATIO 0.999
O2S11 V 0.025
ST FTRM11 % 0.0
O2S12 V 0.620
ST FTRM12 % 99.2
O2S21 V 0.830
ST FTRM21 % 10.1
O2S22 V 0.685
ST FTRM22 % 99.2
CLR DIST mi 1155
CLR TRPS 14080
FUEL LEVEL % 38.8
VPWR V 14.220
ENG RUN m:s 01:16

 

You said that you swapped the coil and spark plug from 5 to 6 then back. Why? When ever my old '03 came up with a cylinder misfire I would replace that coil and plug and that would solve the problem. If you are swapping the coil and spark plug you are just moving the problem from one cylinder to another unless I am missing something

 

Anyone have any thoughts........

 

I swapped the coil and plug and problem did not follow so that should rule out the coil and plug right?

 

Right, but it doesn't rule out the 2-wire connector going to the #5 COP. Then like you said, there's the possibility of a faulty injector. Your next step might be to swap the #5 injector with another one to see if the misfire moves with it.

 

So I need to check the 2 wires from the COP to the PCM to rule those out? Also I have wanted to swap #5 and #6 injectors but haven't had the time lately. Is there anyway to check the injectors without taking them out (resistance or voltage). Also, what does a faulty injector look like (would I know it by looking at it).
Thanks

 

Shot all wires from cop/PCM and injector/PCM and everything looks alright so I swapped #5 and #6 injector to see if problem follows. I will keep ya'll informed to what happens on a drive tomorrow. BTW in my first post one of the pids is REL FRP and its like 2.6 KPA or so. If you convert that to PSI it comes out to less than .5 PSI. How does that work when the fuel rail pressure is supposed to be 40-70 PSI. In the meentime anyone else have any more suggestions.
Thanks.

 

Hold on a minute here you said you think the cam phaser is ticking well i thought the same thing on my wife's F150 when in reality it was a cam follower or rocker didn't think anything of it till it exploded and i had a big mess! what happened was the roller bearing froze wiped out the cam lobe spring retainer blew off luckily the valve didn't hit the piston if the rocker isn't functioning properly it could cause what seems to be a misfire

 

You should only have one wire that runs between the COP #5 and the PCM. One of those wires (red) in the two-wire COP #5 connector supplys VPWR (i.e, 12-volts) to the coil when the ignition key is in 'start' or 'run'. Only the light green wire goes to the PCM connector (pin 34). (The PCM controls the COP by pulling this wire to ground to turn the coil on and release the ground to turn the coil off.) How many volts did you have on the red wire and what was the resistance on the light green wire?

That PID is the RELative Fuel Rail Pressure. I didn't notice what engine you have, but it sounds like you have a returnless fuel system where the PCM controls the fuel pressure by varying the duty cycle of the fuel pump to maintain a constant fuel pressure RELATIVE to the pressure in the intake manifold.

(This system only needs to have enough fuel pressure to over come the pressure in the intake manifold, so that the injector's fuel pressure is greater than the pressure of the air in the intake manifold. Your freeze frame data shows the BARO Pressure (103 KPA) at key on time and a calculated load (CALC LOAD) of 77% and an RPM of 1673 so I presume it was pulling pretty good when the PCM set the P0305 DTC. Looks like the PCM had maintained the fuel pressure at 2.6 KPA above the intake manifold's pressure.)

Your fuel pressure regulator is probably in the tank with the fuel pump and you have a fuel pressure damper on the fuel rail. (The damper will have a vacuum line connected to it only to get ride of any fuel that might leak past the damper diapharm.)

Waiting to hear how the 5/6 injector swap went . . . .

 

PDQFORD--
I have a 2005 Expedition with the Triton 5.4L 3V. and it is a returnless fuel system as I understand it.
I unplugged PCM, COP, and injector harnesses to check for shorts or opens in the wires. PCM connector C175E pin 54 to injector pin 1 and PCM conector C175B pins 51, 52, & 53 to injector harness pin 2. Both wires checked good so I plugged beck in the PCM to check for voltege at the injector on pin 2(red) and got 12.4 V. Good there. I also checked for opens or shorts from C175E pin 10 to COP harness pin 2. Good there. Checked again from COP harness pin 1 to C270D pin 7. Good there. So, after all wires checked good I went ahead and swapped the #5 and #6 injectors. I have driven it twice and havent gotten the code to come back.
The PIDs I listed I wasnt on it at all when the code set. That makes sense about the fuel pressure although I wish my Actron listed Absolute instead or relative. It would make troubleshooting easier. Since I cant afford one of those Rotunda testers is there any other way to check fuel pressure by way of adapter?

Wahl7s---
I had taken the Truck into Ford back in January to get the noise (sounds like a deisel at Idle) diagnoised. they said it needed 2 new cam phasers and thats was it. I specifically asked the tech about anything else such as cam, lash adjusters, followers, timing chain, or tensioners. He said without opening it up he couldent tell me without a doubt but the only thing he heard was the phasers ticking.
Changing the two phasers is a project for me next month though. A freind of mine has agreed to look, when I get it opened up, at the valve train to make sure everything looks alright. I have read it a pretty straight forward job to change them but I will have to get that special wedge tool.