James A. Crider wrote:
> Check the O2 sensors -- I gotta think something is latched lean, which
> causes the ECU to run the engine way rich. Running that rich will lead to
> really high EGTs, too, which will kill the cats, too (by melting the insides).
I'm guessing, but wouldn't the exhaust readings indicate this
condition? According to the guys running the anylizer, everything is
"within spec".
>
> Are the plugs okay? Something like this, the plugs should be nearly
> dripping wet with fuel fouling.
They were wet when removed the other day. It is ceratinly running rich.
> Vapor cannister purge system is another
> possibility. But nearly all of these should twig something in OBD-II. Is
> the crankcase full of gas? Air filter clogged? Exhaust plugged?
Hmmmm. We just had copper exhaust header gaskets installed due to
failure of the OEM gaskets, and they are blowing by too. No matter how
they are torqued, they leak. Could there be excessive back pressure due
to the cats plugging the exhaust? would this cause the gasket blowout?
You would think we would notice an appreciable power loss if the system
was clogged. (Tows a 14,000 lb, 45 foot goosneck trailer with no
problem.) Funny the testers wouldn't notice either? Is there a quicky
way to check the cats, or flow in general? Will have to check the
crankcase and the cannister purge system, I don't know.
>
I found it humorous how many people suggested fuel theft! Nice try
guys, but we towed to Daytona and back and tracked the mileage
carefully. My boss tows his Pro Stock drag car and can track the
mileage too. Leaks were considered, but we use this for work and park
it indoors at night. One would think an odor would be detected if a
leak. We will take another look just to be sure.
All signs lead to rich running, but to dump this much fuel in this motor
and not get red flags during testing is odd IMO. Could it be possible
that we fixed the original problem, but have since melted the cats which
is now preventing us from solving the problem??? Thanks Jim, and thanks
to all for all of the great, and some funny, responses!!!!!
Pat (Glad *I* don't have to buy the gas for this pig) Washburn
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