DMPesso

My boy has an 02 ES300 and replaced the following all at once yesterday:

Rear cat converter(intake manifold), power steering pump and valve cover gasket, 2 engine and 1 tranny mount.

Now today he is noticing his car is running really rich and idling high and is burning a lot of gas it says 8 mpg on his trip meter. My question is would replacing all that stuff cause a possibility of the mechanic maybe pinching a line or doing SOMETHING to cause his car to run rich? I was thinking his car is already run in rich which is why his cat was clogged and now you can actually feel it since it's a new cat. Maybe he needs to reset his ECU because the car was running rich to compensate for the bad cat? Any thoughts appreciated. Thanks

ES300NZ

he needs to
1. check for engine codes,
2. change the spark plugs / check them for colour (it might be a failed cylinder).
3. remove the air filter. ( or replace)
4. check for vaccum leaks/ damaged hoses
5. disconnect the battery and leave it off for atleast an hour.
6. check/sight, the o2 sensor harnesses for damage.
7. (if you really, really must) remove the exhaust, from the headers and sight the colour of the exhaust system to work out which bank or if its both

Megafast13

Yikes. Yeah, start with disconnecting the battery for a few so it resets the computer's system for throttle response/shift points etc.

NickTee

Easiest thing to do is disconnect the battery so the LTFT(long term fuel trims) are erased.
The replacement cat could be bad, which would increase backpressure and cause it to be rich. But if it was that rich, it'd throw a code because the LTFT would exceed -25%. Remember that NEW can stand for Never Ever Worked, which means that while you hope it to work, it doesn't mean it will.
He should also check to make sure nothing was missed.

DMPesso

so he had his TB cleaned and it isnt stalling out and shutting off but its still idling low. So I am going to assume this was the issue? Possibly has to clean it more or get a new one?