Possible that a tankful of "bad gas" caused us to need new fuel injectors, filter, and catalytic converter?

Question

Toyota Avalon, 98; took literally 2 months in their service department to fix. Check engine light kept coming on; replaced computer, even, then put old one back in as it didn't fix the problem. Finally decided we had "bad gas" which caused a variety of problems. Prior to this the car ran great, had always maintained properly. Never buy "unbranded" gas. Generally go to same 4ish gas stations.

Answer 1

It could have been "bad-gas" contaminated with water, rust metals, from the vendor's tank.
What you call "unbranded-gas" is foolish! The vendor(station) where you buy your fuel probably uses the same Refinery that this "unbranded" vendor uses.
There are only a handful of Refineries throughout our Country, and every "jobber, convenience store, and gas station" buy their fuel from the Refinery in their region(area).
The vendor where you purchased the fuel(unbranded) could've had a "bad-filter" on the pump that you used, or could've accidentally dumped the wrong fuel(say some diesel) into their tank, or the cap was left off the tank and water, and trash got into the tank, and the fuel pump "sucked-it" up and it went into your tank.
Before you fuel at any station, always check around the pump you are going to use. Look for signs around the filter on the hose, a black sludge(film, or gummy) around the pump and ground, for signs of contaminates, it does happen, eventhough it is rare. The Refineries take every precaution that they can to ensure good clean proper fuel, but once it leaves their Refinery, they can not control how it is stored once it goes to the vendor. The tanks(underground) that the vendor uses, are their sole responsibility, and not the Refinery.
Also you should never let your tank get below .25% so it will not accumulate moisture in it, and so the "scale" that is in your tank will not build up over time and settle, so it can get through your fuel filters and travel up to your injectors and get inside the cylinders or your engine...
Sorry that you had to endure this nightmare of trying to find the problems that you had before your service shop determined it was "bad-fuel!"

Answer 2

Did you suddenly use Premium after years of using regular? I have heard that since Premium has a lot more detergents and additives people sometimes free up a lot of sludge etc which can actually clog up their engine for a while in this case. Otherwise, my guess is that you also might want to check the catalytic converter it may be plugging up and backing up into the engine. Definitely find out if any of the stations you buy gas at have had problems.

Answer 3

Bad gas? That gas had to be really bad! It's a 98 so I gather, unless you had an extended warranty you're dippin' in your wallet.
The Avalon has that 3.0 L Toyota V6 that's in the Camry, Lexus ES300 and Rx300....pretty reliable engine.
What's a 4ish gas station?
Did you add any additives to the gas?

Answer 4

No, a catalytic converter has not something to do with the gas performance of the automobile, it quite is in simple terms there to regulate the ingredient of the exhaust with are risky to be released directly to the ambience. i think of the mileage has greater suitable with the aid of three different reason, it has not something to do with this.

Answer 5

yes it is possible, but you dont need new injectors!
Reverse osmosis technology can clean the injectors! or get a bottle of wynns www.wynns.com
as for the filter it needs to be replaced, cat can stay unless you are shooting hard rock like things from your system, but i somehow doubt it unless you have been in an accident or gone 4x4 in it!