Interesting.
Oddly enough despite me earlier thinking there was no way this was an exhaust blockage problem,,, as I disprove all my other armchair diagnosis,,, I started to think about a blocked cat.

In my head I would never think it could act like that, but I'll believe you (as I'm running out of ideas).

Would you think its possible though on a 30K mile truck?
I mean literally 30k miles, it just turned 30,000.
I would have thought it more probable on a 130k mile version.

Thanks for your input. I do appreciate and will look into it.
Cheers
jimmy

 

every time I have seen a cat cloged. It was glowing bright red after just a mile drive. Try driving it at night few miles get out and look at the cat if not much red its not the cat.

 

With 30k miles it would be hard to think cats are clogged but its worth a look.
Do you have a infrared temp gun you can shoot before cat and after ?

 

You can buy a infrared tempgun at harbor freight for $30. Beats taking the exhaust apart for no reason.
We had a ford escape company vehicle that saw some offroading due to accessing trains in rural areas. The cat was almost completly blocked. Truck wouldn't go over 30mph floored.

 

had similar diffrences in b1 to b2 fuel trims, with my 99 v10 turned out to be a jammed fuel injector. tracked it down by pulling the injector clips while the engine was running with my scanner hooked up checking the fuel trims. onece evened out turned out to be cyl 9, swapped the injector out and problem went with it.

 

FIXED,,, finally.
Resolution (in my case) - Dead or Clogged cat.
I'm not sure what makes cats die, but mine was clogged.
My truck is back to running fantastic again.
Calculated Load 18% at idle, fuel trims virtually identical.

Now that its mechanically sound, I cant wait to do the 5 Star Y pipe and tuner.

I'm SOOOOOOO happy.
I must admit I was really ready to trade it in on a 6 speed 6.2.

My old truck is back, it feels so awesome to actually wind it out at WOT again.
I almost forgot how much juice these V10s have.

Hope this thread helps someone in the future.

 

Bingo.
Thank you!!!
This is what it was, clogged cat.
Truck is running awesome again.
Cheers
jimmy p

 

So where was the blockage? Internal to the cat, or could you see it....

 

Great job guys...
Reps to both Racerguy and Jimmy for hanging in there ... This is why FTE is great!!!

Mike

 

Awesome!!! Racerguy FTW!!!

 

Well I dont know alot about the science of cats, but I have heard that if you hold a shop light up at one end you should at least see a glow through the cat.
Mine was completely 100% not passing any light.

We then hooked a shop vac up to one end and it loaded the shop vac down as soon as we turned it on.
We A-B'd it and it was definitely loading the shop vac down.

We then took it for a ride with the exhaust unhooked and a passenger with a better Snap On Solus(?) scanner.
100% night and day difference.
Truck was back to normal.

To me it was completely definitive.
Now, I dont know what caused it to happen, time, corrosion, nesting varmints,,,???,,, but its fixed now and running awesome.
It will pull hard at WOT until I run out of road.
It has not seen the north side of 2800 RPM since August,,, and now its completely back to running like an animal.

Thanks to all you guys who offered help, suggestions, your readings, your experience and moral support.
I REALLY appreciate it.

Mike I'll be callin' ya tomorrow.

Cheers
jimmy

 

Excellent news people...

 

I am agreed that this is why FTE rocks!! Glad to hear it all worked out. All the in between diagnostics in this thread will help many. Jimmy, is your scanner reading correctly also? I really like this scanner and it has helped several of my friends also.

 

Funny you should ask that.
My Innova does not match the readings of the snap on.
Its close, but the Snap On seems to have detected a much larger change than the Innova.

The Snap On seems more sensitive.
It has a PCB "key" that snaps into the dongle that seems to be somewhat specific to the vehicle year or brand.
I'm not sure which, my friend was assisting me and its his machine.

I think that may allow it to get more accurate readings?
Not sure but I do know they dont match 100%.

I assume his cost much more and is a professional mechanics tool, our innova is likely more a shadetree level tool I would guess just going by comparing the costs of the two units.
In any case it was the Innova that allowed me to hunt down the problem.
I am 100% happy with my purchase and looking forward to having it for the future. I dont think a hobby mechanic can (should) own an OBDII vehicle without a scanner with live data in the toolbox.

cheers
jimmy

 

I'd checked my Load with my scan gauge and I get 48-50 at idle,trucks runs perfect.
do you think I might have a clogged cat with no symptoms?Thanks