Top Answer
User Avatar
Wiki User
Answered 2016-01-21 16:13:23

Be sure to replace the O2 sensor. That's a big one especially if it's high miles and has never been changed. Answer Things to check/try in order to improve fuel mileage on almost any vehicle: 1) Tire Pressures. Are tire pressures no lower than manufacturer recommendation? Remember to check tire pressure in the morning (when cold), and that a 10 degree (Fahrenheit) drop in outside air temperature will decrease tire pressure by about 1 psi. Also, some tires, especially older ones, may "leak" up to 1 psi per month. If pressures are too low, try to visit a station near home, and put in 3 or 4 more psi than you want - after a few hours or next morning, check pressures and bleed any extra pressure. Why: tires may read 3 or 4 psi higher after a few miles' use vs when cold. 2) Alignment. May need alignment. Can't really tell without putting it on an alignment rack, unless it's pretty bad, in which case you may see uneven wear (especially on front tires). 3) Brakes. One or more brakes may be sticking (especially front). I've had this happen on BOTH our vehicles. 4) Bearings. One or more wheel bearings may be binding/failing (unlikely, but possible). 5) Oil. Are you using 5W30 oil in cold weather and 5W30 or 10W30 in hot weather? Changing oil AND FILTER regularly (at least as often as manual says)? 5) Vacuum hoses. Check that all vacuum hoses are secured and intact. 6) PCV. Replace PCV valve (as you face engine from front, it's way in the back left corner, almost as far as you can reach; narrow space so it's a bit tedious to change, but no tools required - about $5). 7) Wires. Are ignition wires in good shape (ie, no cracks, etc.)? 8) Other. One or more engine accessories (alternator, Power Steering pump, air conditioner, water pump, etc.) may be binding (unlikely but possible). 9) Heating and Air conditioning will have a lot on fuel consumption in addition to driving habits, city driving or highway driving. A big difference in fuel consumption when driving 60mph (~100kmph) and 80mph (~130kmph) on highways. Answer i would strongly suggest replacing the mass airflow sensor in this case. when they get dirty, the computer cant tell how much air is going into the intake, thus to the combustion chambers. so when it gets to the exhaust, the air fuel ratio sensors see alot of air. when these sensors see a lot of air (02), the computer holds the injectors open longer to compensate. this extra fuel adds up to loss of mpg!

      • WAIT! Before you replace that horribly expensive Mass Airflow Sensor, pull it out and *carefully* spray it clean with brake cleaner or an electronic cleaner of some sort. And do NOT touch any of the itty-bitty wires inside with anything or you WILL be replacing it. Anyway, an awesome Toyota mechanic told me to do this before replacing it and it improved performance tremendously! He said the sensors were notorious for getting all gooped up and sure enough, he was dead-on right. After 112,000 miles, ours was covered with gunk. I should have cleaned them at 75,000! Our 2000 Sienna can spin the tires at a stop light again. Also, installing a K&N type oiled filter can also contribute to the build up so be aware if you do that too.
User Avatar

Your Answer

Still Have Questions?

Related Questions

The word error shows up in the mileage?

The word error shows up in the mileage area of my car. Is that an electrical problem?

How can you reset mileage on zafira?

help my zafira is due mot but cant have 1 until my milage apears on my meter it just disapeared leaving only -------- and current mls i drive which can be reset no problem ????????????????

What is the current problem in killing yaks?

what is the current problem in killing any endangered animal? the same thing

How does solving a simpler problem help you solve the original problem?

You gain relevant insights from solving that one problem, and then you can use those insights to help guide you to the solution of the original problem.

How is problem to be research problem?

current issue in human right

What are the current problem in the Philippines?

the garbage /the weather/ and the leader are the biggest problem

How do you solve for current using volts and watts in a problem?

watts = current * volts current = watts / volts

What is the current problem with the Great Barrier Reef?

The current problem with the Great Barrier reef is that the pollution is lilling the wildlife and harming the coral in the reef

Does stomach problem increase heart rate?

It can actually. but again, depends on your stomach problem.

What is the original problem in the book Animal Farm?

The original problem in Animal Farm is that Mr. Jones, the owner of the farm, treats the animals cruelly and they don't like it.

What is a proposed answer to a scientific problem?

Usually the current 'answer' to a scientific problem would be called a theory. However when used in an experiment people refer to the current answer to a problem as the nul hypothesis and the new, to be tested, theory as the alternative hypothesis.

What is relevance of communication?

Relevance is a measure of how appropriate, is what you say for the momment you say it. To be relevant means: - Not to deviate from the original subject of the discussion. - Understand the current problem. - Communicate the appropriate solution to solve it, with the appropriate means.

How did increase in imigrants in 19h century be problem?

Describe problem created by immigrant growth in 19th century

Should i stay friends with an ex boyfriend while in a relationship boyfriend?

if it is ok with your current boyfriend there is not should about it...if you want to then do it, if not then dont, if your current bf has a problem with it then that is his problem not yours

What percent of increase from 20 to 39?

There is a 19% increase between 20 to 39. This is a math problem.

When phase and neutral are glowing what is the problem in circuit?

There is more current flowing and the wire can not flow that much current.

What effect does changing thermostat have on gas mileage?

If you put in a T-stat that's too low, the computer will think the engine hasn't warmed up and it will command a richer air fuel mixture. That will reduce your gas mileage. It's never a good idea to use a T-stat that's different from factory. If you have a cooling problem, fix the problem the right way. I'm a retired ASE Master/L-1 Technician. I still keep current with the latest automotive technology.

Why is an increase in a gas that takes up a tiny part of the atmosphere a problem?

The problem is in what that gas does, or can do when left to accumulate in the atmosphere.

How can you help your friend when she has a problem with her friends?

You can comfort her, and advise her on what to do. Advice could be help and how to avoid her current problem.

2000 Toyota sienna CE gas comsumption is really bad anything you can do to improve mileage?

Not much. The Sienna is rated at 18 city 24 highway, which is actually pretty good for a minivan. If you are getting way less than this, then you have a problem somewhere. You may need a tuneup, as in new plugs & wires. If you are within this range then your vehicle is doing OK. Make sure the tires are at the proper PSI as outlined in your owners manual. A clean air filter is a must, and a properly running engine. Drive for mileage, as in slow take off and driving close to the speed limit. Other than that, there is no magic device to increase mileage. There are many snake oil products out there that claim to increase mileage. They do not work, so don't fall for the hype.

If the multiplex unit goes out on a 2000 Honda Accord will it not record the mileage until it gets replaced?

I am not familiar with a multiplex, but if you are referring to the instrument cluster then yes the computer will store your mileage. If it is the speed sensor that is the problem then no.

Is Serbia awesome?

Other then the current problem with milk it is awsome

How can you increase volume in Nokia 2626?

There's no way to solve this problem....

Still have questions?

Trending Questions
What times 10 equals to 1000? Asked By Wiki User
How old is Danielle cohn? Asked By Wiki User
Unanswered Questions