Recently installed new CATs and new A/F sensors.
Took it took a muffler shop to get new studs and bolts on the connecting flanges on the rear CATs, as there were some leaks at the flanges when I tested it after about a month of driving.
After the visit to the muffler shop, I'm getting this code, P1283 which seems to indicate a possible exhaust leak or A/F sensor issue...
Now, I took it to a mechanic, we had a look underneath, and this thing is tight.
No leaks anywhere on the exhaust. They had one guy gun the gas from inside the car while inspecting it from underneath - nothing. They could not tell a leak. Unbelievable. I was there too, I swear there is no leak on the system....
This is what I'm experiencing:
Noise OUTSIDE the truck - I swear I can't hear nothing. The truck seems quiet. Had a relative do "drive byes" if I could hear anything...nothing. Rolling away from me, the truck is quiet like a mouse.
Noise INSIDE the truck is very loud when applying gas.
When Idle in Drive or Park, there is definetely a shake, when in gear.
When pressing on the gas from a stop, the shake smooths out, but, as you put gas down to accelerate, there is a rumble underneath near the footwells, like there seems a big if not huge exhaust leak. VERY pronounced undeneath and throughout the truck.
Coasting, off the gas, you don't hear anything.
Everytime I put the gas down, it roars. Going uphill, it roars.
Should I pursue a failed CAT on Bank 2?
Has the muffler had an internal failure and backpressure is causing the issue?
I'm thinking this problem might be related to fuel injectors. Something to do with the noise increase with the gas being applied.
Strange thing. In Neutral - I can gun the car, and the noise is not pronounced.
Put the truck in gear, with load, it really is loud when accelerating
When I read my A/F numbers, from my cheapo OBDII, the A/F numbers are "ok"
I'm getting the normal .6 and .3V displays from them with no jumps -very steady as if the a/f is doing its job.
If these have "normal" signals, what's throwing the code?
The rear O2s dont seem to respond much. they have a very steady signal .7v when running, with the truck warmed up on the OBDII