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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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#2 of 75 engine light by gotchaa Aug 21, 2002 (3:26 pm)
i have a 98 avalon xl and we have changed the oil an filter every 3000 miles. we have been using regular unleaded gas. it now has about 50,000 plus miles on it. a while back the check engine light came on, so we went to the dealership. there we were told that because we used regular gas we needed to replace the egr valve and solenid for about $350.00. I don't understand why I need this when we were told that regular unleaded gas was fine. Has any body else had this problem. If you use premium gas over 50000 miles you will spend $300 or more just for the higher grade gas and I don't think they will guarantee you don't have to replace the egr valve. Despite the engine light the car runs fine. no hesitation or misfiring or anything. has anybody else had this problem and how did they handle it. It seems to me that this should be a factory thing and the consumer should not be caught on this.
#3 of 75 gotchaa - Premium vs. Regular by highlander7 Aug 22, 2002 (1:07 pm)
We have a 03 Avalon and the book recommends premium for best performance. From what I have read on these posts, cars that require higher octane get better performance and increased fuel mileage by using this vs. regular. Would be interested to hear if anyone else has had to replace the egr valve and solenoid at 50,000, that is much too soon. Wonder if a warranty - emissions or other would cover this? I have put 130,000 plus on Hondas and Acuras and never had to replace these items.   question: What brand of regular do you use? Some people feel that gas is gas, others say that some select major brands like Exxon, Mobil, Texaco are the best. I only use Exxon or Mobil and have never had a gas problem, probably have been lucky.
#4 of 75 Premium vs Regular by twobrowns Aug 22, 2002 (5:52 pm)
I have a 2002 avalon with 10000 miles on the car. I have tried both reg and prem. and could not detect any significant difference in mileage or performance. If there is a difference it must be minimal.
#5 of 75 Re: Premium vs Regular Gas II by bjk2001 Aug 23, 2002 (7:01 am)
We have a 97 Avalon XL with 92k miles on it. I changed oil and filter efvery 5,000 miles. Fisrt 30K was serviced at dealership after that just local mechanics with No Name Brand Oil filter and whatever oil they have in stock. No Problem with our engine, got a letter from Toyota regarding some engine sluggish problem. I check our oil No problem at all. I always use regular gas. Used premium gas a few times when it was $1.29 per gal. Throttle body did require some cleaning a couple times.
#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.

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