Well.. I had a look under the truck and saw the Cat was various shades of blue. I gave it a little shake and I thought I heard a rattle.
I figured it was broken inside, or I cooked it, so i cut it off to have a look in.
Turns out I can see through it, but it looked like a little bit of sand came out of it.
I don't have to get a emission check where I'm at, so I COULD replace it, or leave it off. As i decide, I put a piece of pipe in it's place.
Things I noticed without the cat......
1. its a lot louder through the muffler and the sound is deeper.
2. With cat, the truck stopped pulling at 4200 rpm, now it will rev to 5000 rpm (barely)
3. Idle vacuum is up to 18 in (with cat it was 15) but driving vacuum at 90 km/hr is still 10 in and under (which isn't good)
4. No idea if mileage is better. I filled up today so I will see
5. For some reason, the transmission shifts higher (not shipping manual) although I did not adjust the kickdown cable!!!
6. A lot more popping when I lift off the gas pedal (maybe it did it before but i didn't notice it cause the cat dampened the sound)
Any ideas?
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