Posted to Emissions Forum on 8/21/2017
34 Replies
Hi all,
I'm having trouble getting CAT, O2 and O2 Heater monitors to
run on this 4.0 V-6 Mustang. It is completely stock, not so
much as an aftermarket air filter. 2 years ago it passed
IEPA emissions testing with all monitors ready. Now it is a
chronic reject.
I have tried the TechHelp route, and although I got 7
replies, it has fizzled. TechHelp seems to work well for a
day or two and is revived by an update and then that's all
you get. So here I am hoping for some advice.
Here's the link to the TechHelp:
http://members.iatn.net/techmail/view/index.aspx?origin=14&d=1&de=1&k=&m=22813&t=ford_drive#reply_anchor
So, here is what I know so far.
1) Fuel trims are optimal at all RPM ranges ( STFT & LTFT
-or+3% rarely getting much higher, sometimes a total of 7%
usually during RPM transitions .
2) Graphing O2S data I found an issue with the B1S1 O2S:
[2005 Ford Mustang, Emissions Scan Data] I replaced
both B1S1 & B2S1 with new Motorcraft O2 sensors, did not
help!
3) Mode$06 has zero values for all Cat and O2 tests, meaning
the PCM isn't testing after all this time:
[2005 Ford Mustang, Emissions Scan Data]
4) No misfire found in scan data or Mode$06:
[2005 Ford Mustang, Emissions Scan Data]
[2005 Ford Mustang, Emissions Scan Data]
5) No codes found, ever. Even so, have cleared codes a few
times hoping to kick start the readiness monitors.
6) Found that the PCM has updated software available,
re-flashed it, no help:
[2005 Ford Mustang, Emissions Scan
Data];detailed=1&t=visible&i=1&sr=12&sb=%5
Btimestamp%5D%20DESC&s=1&rb=
[2005 Ford Mustang, Emissions Scan
Data];detailed=1&t=visible&i=1&sr=12&sb=%5
Btimestamp%5D%20DESC&s=1&rb=
7) Followed these instructions on IDS to set readiness,
several times:
http://members.iatn.net/file/viewfile.cgi?
id=94738&detailed=1&t=visible&i=1&sr=12&
sb=%5Btimestamp%5D%20DESC&s=1&rb=
9) In OBD Mode$01 data, the enable PIDs for CAT, O2, O2
Heater are always a "NO" value. One exception. KOEO, the CAT
will read "YES" until the engine starts and quickly reverts
to "NO":
[2005 Ford Mustang, Emissions Scan
Data];detailed=1&t=visible&i=1&sr=12&sb=%5
Btimestamp%5D%20DESC&s=1&rb=
10) Cat temp seems to rise as high as 1400 F and usually
hangs around 1200 F:
[2005 Ford Mustang, Emissions Scan
Data];detailed=1&t=visible&i=1&sr=12&sb=%5
Btimestamp%5D%20DESC&s=1&rb=
11) The one problem that may have some weight is the FLI.
The Fuel Level Indicator will read a maximum of 53% even
with a full tank. This vehicle has a dual pump system with
two fuel senders. There is a TSB from Ford on this.
I would gladly sell the repairs to the customer, if I knew
that was the issue. I think FLI is not the issue because
EVAP runs consistently. Also, regardless of what's actually
in the tank the FLI should be enough to set readiness.
I will sell it to the customer as soon as I can prove FLI is
the issue. It is a somewhat expensive repair.
I will add more as I go, I hope to hear from my friends out
there and start to fix this problem.
Thanks,
Bob Haines Owner/Technician Bob's Garage Waukegan, Illinois, USA
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