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Toyota Avalon Fuel and Fuel System Questions

75 messages,  Last post on Jun 20, 2008 at 1:09 AM

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#6 of 75 1999 Avalon - What the best gas? by saw_williams Feb 03, 2003 (11:40 am)
To Any&All -   I'd read, in a buyer's guide, that premium gas is recommended for new Avalon's. Does this hold true for a 1999? And if so, would it be detrimental to fill up using regular?   Thanks,   Stephen
#7 of 75 by 8u6hfd Feb 03, 2003 (12:19 pm)
Not really, since the engine has dual knock sensors (one for each bank). Upon presence of knock, the ECU to retard the ignition timing to prevent the knock, but may decrease performance and fuel economy.
#8 of 75 check engine light by slocum2 Apr 10, 2003 (5:54 pm)
I have a 2000 Avalon XLS with 57,000 miles. Due to a check engine light last August, replaced fuel injector #4. This week the light came on again, took it to the dealer and they stated injectors 1 and 3 had a bad code and suggested replacement. Interesting they gave me a price to change the 2 and also for 5 injectors. As an alternative he said that some fuel injector cleaner may help and to change brands of gas. I have used BP/Amoco exclusively. Opted for the injector cleaner and 3 miles from the dealer the engine light came back on. Car seems to run fine. Has anyone had this problem???
#9 of 75 slocum by moonshadow Apr 10, 2003 (8:09 pm)
I assume you have exceded your 3 year time limit,, on the warranty.   All good gas has the cheapy fuel cleaners in them. Have had some success with a more expensive type (wynns- hot shot ), however it will take a lot more than 3 miles for any tank additive to do anything. Mimimun the whole tank. Since the injectors are failing in sucession it could mean crud in the gas, moreso the holding tanks at your favorite fill spot and not the gas brand. Remember these added injector cleaners are questionable and will take out some sludge/crud/varish deposits but not silt/rust particles resulting from a deteriating tank.   Unless they did an injector cleaning, either at the fuel rail or by removing them, you were not that specific.   Of coarse , you could have defective injectors, but i am not familiar with the history on toyotas injectors. Good luck
#10 of 75 Fuel Cleaners by travelerjb Apr 13, 2003 (12:59 pm)
I rather doubt there are too many decenting opinions on the fact that Chevron's "Techron" is the finest overall fuel system cleaner. BMW, Volvo, VW and several other manufacturers use it "rebadged" in their own parts departments at the dealers. ALL of the Chevron gas's offer some of this product IN the gas. The Premium has by far the highest amount of Techron supplies right with the gas at the pump. This info is via Chevron's own web site information on their product. I know I have always liked their gas and never experienced ANY fuel system issues since about 3 new cars and about 12 years ago. I tend to drive largely on the highway so maybe that helps also. I also keep it shall we say...blown out of junk. Amoco and Mobil are known to have good additives as well, but none as highly respected as Chevron's "Techron", which can easily be bought at auto parts supply stores in black plastic bottles.
#11 of 75 avalon fuel injectors by slocum2 Apr 17, 2003 (12:53 pm)
Took the vehicle to another dealer for a second opinion. They replaced the remaining 5 injectors under warranty even though the car has 57,000 miles. The new injectors have a different part number so I assume Toyota recognized the problem. Only paid $200 for the labor. Interesting the first dealer did not offer to replace under a warranty. The second opinion saved me $750 and I found a new friend.
#12 of 75 Avalon fuel injectors - for slocum2 by bsteff Apr 20, 2003 (5:48 pm)
I also have a 2000 XLS. My "check engine" light and the "traction control off" light both came on suddenly one day. I had been noticing some gradually worsening hesitation on acceleration for about 3-4 weeks. Took it to the dealer here in Mobile, AL and he told me that mass air sensor was dirty. Cleaned the sensor and the car has been fine. I didn't realize how much power I had lost until after the cleaning. I also used BP/Amoco gas. I have just switched to Chevron with Techron in it. I have 58,000 miles on my XLS. From the slocum2 comment, this seems to be when dirt builds up in the fuel system. I will purchase Techron detergent fuel additive and use for the next 2 or 3 tankfuls. PS my brother has a Lexus 300 and has only half the rear seat room the Avalon has.... Replies to this message: cob10 (May 05, 2004 7:55 am)
#13 of 75 Re: Avalon fuel injectors - for slocum2 [bsteff #172] by cob10 May 05, 2004 (7:55 am)
Replying to: bsteff (Apr 20, 2003 5:48 pm) I also have a 2000 XLS and my "check engine" light came on…. the engine had a gradually worsening hesitation on acceleration. Sounds like you are describing my problem.... The dealer said the problem was a dirty mass air sensor… Cost me $90. They also suggested my injectors be cleaned for another $90…I had both air sensor cleaned and the injector service done.. fuel additive and pressure flush the injectors with some cleaner… I just wonder it the injector cleaning was truly needed? In any case, the car runs fine now. I used my Costco discount for 15% off the service.
#14 of 75 Same physical needs-Large Seats on the Avalon by abfisch Oct 30, 2003 (5:33 am)
Travelerjb:   For the same reasons you described above, I too pick the Avalon. I had wished Honda had made a large full size car, without going into the Acura brand, but that was not the case. The large comfortable Avalon seats and ease of getting into them were one of the reasons I bought this auto. My only criticism of the seats would probably be that there still isn't quite enought seat travel in reverse. Seating in a Lexus LS430, I can move the seat back so far that I cannot touch the steering wheel or pedals, and I too am rather large at age 45. German cars too have better seat travel, but that is another story. Nevertheless, for us ole folks, the car is a pleasure to sit in and get in and out of. An important feature for those of us who utilize it heavily.   Has anyone in the forum changed the front gas filter at 30K themselves???? There is a quick connect on top. The manual states you have to take out the rear seat and disconnect the neg terminal after disconnecting the fuel pump. Can anyone comment on just relieving the pressure by just opening the fuel filler cap, waiting and then disconnecting without spilling too much, carefully and replacing the filter. It cannot be that hard. Many incompetent people do it??   A.Fisch
#15 of 75 Fuel Filter... by nomad56 Oct 30, 2003 (8:29 am)
A.Fisch, the Avalon has a "pressurized" fuel system. Opening the gas cap will NOT relieve the pressure. Disconnecting the fuel line will dump a lot of fuel, much like opening the nozzle on a hose that has already been shut off, there is fuel under pressure in the lines. Disconnecting the PUMP does not relieve the pressure. It stops the build-up of more pressure when you do the following: 1) Disconnect the pump-neg terminal behind seat 2) Start and run the car until it stalls-any pressurized fuel in the system has been relieved. Now it is safer and cleaner! 3) Remove key from ignition. Use caution when tightening these lines, not to twist them. Also, a thorough inspection of the fuel lines should be done to look for leaks. -nomad56-

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