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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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#68 of 75 Re: What grade fuel for 2008 Avalon? [fin] by jbcamel May 08, 2008 (1:01 pm)
Replying to: fin (May 08, 2008 9:31 am) Thanks, but I want to know what the manual says. My husband is a "strictly by the book" guy, Whatever the owner's guide says he'll do.   So, back to my original question: what does the Owner's Guide say for the 2008 Avalon?   thanks Replies to this message: fin (May 08, 2008 2:33 pm) jbcamel (May 08, 2008 4:22 pm) geo123 (May 08, 2008 4:51 pm) and 1 more...
#69 of 75 Re: What grade fuel for 2008 Avalon? [jbcamel] by fin May 08, 2008 (2:33 pm)
Replying to: jbcamel (May 08, 2008 1:01 pm) Mine is an '07 Limited, not an '08, but the engine settings should be the same. Use 87 octane minimum. If significant knocking occurs, change octane grades or brands of fuel. Engine knocking, if severe, will ruin an engine. Hope this helps. Replies to this message: jbcamel (May 08, 2008 4:22 pm) geo123 (May 08, 2008 4:51 pm) jbcamel (May 09, 2008 4:37 am)
#70 of 75 Re: What grade fuel for 2008 Avalon? [fin] by jbcamel May 08, 2008 (4:22 pm)
Replying to: fin (May 08, 2008 2:33 pm) Thanks, but again I need to know what the Owner's Manual says. Replies to this message: geo123 (May 08, 2008 4:51 pm) jbcamel (May 09, 2008 4:37 am)
#71 of 75 Re: What grade fuel for 2008 Avalon? [jbcamel] by geo123 May 08, 2008 (4:51 pm)
Replying to: jbcamel (May 08, 2008 4:22 pm) Here you go!   "Your vehicle must use only unleaded gasoline. Unleaded gasoline with an Octane Rating 87 (Research Octane Number 91) or higher required for optimum engine performance. At minimum, the gasoline you use should meet the specifications of ASTM D4814 in the U.S.A. and CGSB3.5-M93 in Canada." Replies to this message: jbcamel (May 09, 2008 4:37 am)
#72 of 75 Re: What grade fuel for 2008 Avalon? [geo123] by jbcamel May 09, 2008 (4:37 am)
Replying to: geo123 (May 08, 2008 4:51 pm) Thanks!
#73 of 75 Attempt to remove IAC for cleaning due to rough idling by hawiianavowner May 24, 2008 (10:35 pm)
I posted this elsewhere and thought this could help someone here: My 2000 Avalon has +130K and is running well except for intermittent rough starts, had to keep foot slightly on throttle at times. Googled and found it may be IAC valve. I know it's discussed earlier in this forum, but I ended up NOT removing it for cleaning:   Disconnect neg battery cable first. Next remove the air regulator with the intake hoses attached. The hoses may be somewhat stuck, but are made of a hight quality rubber ($27 toy price for ONE), mine are 8 yrs old and were NOT brittle.   Then remove the engine cover (easy),disconnecting the pcv valve hose, throttle cables (easy), disconnecting several vacuum hoses (easy) and sensor plugs (easy, if you push the release) but then there are more hoses with slip rings on them that are difficult...the slip rings need small and angled needle nosed pliers to get the right angle to release them. Then, slipping the hose off it's connector requires strong fingers to free them for their connectors. That took the most time, patience and sometimes careful prying.   Once all that is done-90 minutes for me, there are 4 bolts for the throttle body that are medium easy to loosen with a metric wrench. The throttle body (TB) is now free to flip over, and access to the four screws attaching the iac to the TB is achieved...then comes the next big problem.   The screws require an exact fitting philips screwdriver to remove...i have read some used an impact driver to remove it...others stripped the screwhead and used either a vise grip or the stripped bolt remover from Sears.   I gave it a try with my available philips, saw that none of the screws budged, and decided to leave the iac on. Put the TB assembly back on right side up and over the next half hour squirted TB cleaner into the iac opening, letting it drip on to a rag i placed on the bottom of the iac. Also cleaned the TB ports with the cleaner and rag.   My problem was intermittent rough idle, stalled starts, possibly due to a sticking IAC.   The sticking is caused by oil vapor deposits on the IAC, i think it comes from the pcv valve, bec i found oil deposits iside the air regulator. Toyota service will recommend replacement at $200 for the part, plus labor.   So after my "cleaning" I replaced everything in reverse order, the hardest part is replacing the slip rings to the orginal positions, tested the startup and there was no rough idling at all.   It's only been one day, but others have not had their idle problems return after cleaning the IAC.
#74 of 75 2003 Avalon gas mileage changes daily by sbarker Jun 19, 2008 (11:48 pm)
Hi, I have a Toyota Avalon with just 30,000 miles. the car is driven locally every day and has been getting 18.5 - 20.0 city type driving. This morning same type driving it says 16.4 - 16.9 What can couse this? The car runs excellent and is not driven hard at all. Can the dashboard mileage meter be crazy or is this a sign of maintence needed. Thanks Replies to this message: rpfingsten (Jun 20, 2008 1:09 am)
#75 of 75 Re: 2003 Avalon gas mileage changes daily [sbarker] by rpfingsten Jun 20, 2008 (1:09 am)
Replying to: sbarker (Jun 19, 2008 11:48 pm) Sbarker....      not sure why your mileage decreased, but even so I'd have someone look into that because even you previous mpg estimates seems alittle low to me. My avy avg's between 25 and 27 driving locally ( a mix of city and short hiway driving ). 18 to 20 would really be low in my opinion.   Roland

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