Question about 1998 Toyota Sienna

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Improve fuel mileage

I changed the spark plugs and air filter and still only get 13-14 miles per gallon around town. i have a very light foot.

Posted by Anonymous on

6 Suggested Answers

6ya6ya
  • 2 Answers

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Posted on Jan 02, 2017

  • 1861 Answers

SOURCE: 2005 Prius change in MPG after dealer service

What was the weight of the oil that was put into the engine when it was changed? Prius engines are VERY PICKY about the proper weight of the engine oil. Trust me. I see this quite often. The wrong weight oil can do bizzare things, and def lower your mileage. Something you can check: Take off the tube leading to the throttle body, and look down into the intake. Do you see any oil laying in the intake manifold? If so, you DEF have the wrong weight oil. This will NOT set a Check Engine light, either. Hope this helps.

Posted on Sep 11, 2008

  • 18 Answers

SOURCE: Loss of power

Do you know how check if every cilinder is working? with the engine in idle, go to the distribuitor cap and carefully unplug one at the time, every cilinder spark plug wire,in the cilinder you dont see a diference in rpm variation, that cilinder is not working, replace spark plug, if you see spark jumping fron the distribuitor cap torch the spark plug wire, another cause to a cilinder fail could be a loss of compression in one or more cilinder

Posted on Nov 02, 2008

  • 1861 Answers

SOURCE: Location of the PVC and gas filter on 4 cylinder 2003 Solara

The PCV and the fuel filter replacements are not going to increase you fuel mileage. What you should really consider is getting some good fuel injection cleaner into the tank, and get an "induction system cleaning". Those two items alone will address most of your mileage issues. The PCV does nothing for mileage, nor does the fuel filter. Also, for maximum fuel mileage, you should have the correct sparkplugs from Toyota in your car. "Aftermarket" plugs doe not perform very well at all.

Posted on Jan 10, 2009

aaangie220
  • 202 Answers

SOURCE: 2006 Toyota Tacoma Low Mileage or Not...Spark Plug Life

24 mpg on the highway is actually pretty good for that truck. at 48000 miles and being 3 years old its time for plugs, air filter, and fuel filter if available. thats cheap maintenance for now. but if very self conscious, run some fuel injector cleaner first, then change the plugs, because any octane booster or fuel injector cleaner can run the risk of fouling out a plug, by creating a hotter spark then what, normal gas does. the burn is hotter.

Posted on Mar 18, 2009

  • 1779 Answers

SOURCE: Sluggish performance and engine light - added new plugs and oil

You need to check for engine codes to see what is wrong. Bring it to a parts store for a free scan for codes. The check engine light indicates a problem, probably the emissions system, which is causing the poor performance. The parts store will plug a hand held scan tool into the cars diagnostic port (usually located under the dash) and 'read' any codes stored in the cars computer. They can them tell you what code #'s come up, what they mean, and how to correct the problem. If you have any questions after that, post them here w/ the code #;s for further help.

Posted on Jul 27, 2009

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this is what I would do. I have the 1993 model and get 22.5 to 23 miles per gallon.
I would change the plugs, change the plug wires, change the fuel filter, change the air filter.
if you have done this lately then one overlooked item would be the coolant thermostat.

when you first crank the car and the engine is not warmed up, it runs in a "closed loop" mode and it gets bad mileage. the computer doesnt care about mileage at that point, it just wants it to run good.
after the coolant gets up to temperature, there is a coolant temperature sensor ( should be located screwed into radiator somewhere) that alerts the computer it is up to operating temperature. the computer then goes into a "open loop" mode and the computer then constantly changes the air fuel mixture to make the best out of emissions ,milage, and power,...
so, it it is not getting up to temperature it could be the coolant thermostat is stuck open. if you cant remember when the last time its been replaced then you may want to go ahead and do it.
if that dont work, it could be the coolant temperature sensor itself.
When I was carpooling in my caddi I drove 7 miles down the road to catch my ride. I get 15 miles to the gallon. and spend more on gas then if I just drove by myself. when I drive to work my self (35 miles) I get 23 miles to the gallon with stop and go averaging speed of 50

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First things I would look at is,did they put 10w30 oil in and not 5w20 or 0w20,it makes a difference in mileage (if they run out of the correct viscosity oil they WILL put in what they have).
Did the service include a spark plug change?Is the spark plug gap correct?
Did they do a brake service?Is a brake dragging,a little to tight?Did they clean the throttle body?Maybe the engine was running a little lean before and now is at the proper fuel mixture,with less MPGs but running clean at the exhaust.
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If you want to improve the your gas mileage then you have to do the required maintenance
Oil change every 3000 mile
tune up as required
Air filter
If the wiring spark plug wire is old and crack then it need to be replace.
If you park out side and the batteries is about 5 years old have it check
If you buy the car new, you will have a car book follow the maintenance routine.
If you have done all the maintenance and the gas mileage is low than recommended then take it to a shop to figure out if some thing is wrong or not preforming as it should.
I do hope this help you.

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Check the torque on your plugs, should be around 15 - 19 lbs - consult spark plug manufacturer on the torque - if you did not torque them enough, they may have become loose. Also check coil packs - make sure all plug wires are snug.

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