What is there to tune-up?

See link below
http://2carpros.com/how_to/how_to_tune_up.htm

mmay be becoz of ur drivin conditions the mileage s dropped down.... did u chk out the tyre pressure.... is ur car overloaded....r u drivin in top gear or not.... mileage depends on everythin... so please chk everythin properly

spark plugs/wires. air filter/ fuel filter. I would also clean out the intake with some intake cleaner.
Do those then let me know.
Thanks,
Lee

If you're looking to get better gas mileage purchase a different vehicle. The 4runnner is only going to get 22-24 mpg at best for highway. If most of your drive is in town then 11-13 mpg is about right. There are a multitude of things to consider when trying to get better gas mileage from your vehicle, especially a 4 wheel drive. Besides the running performance of the engine, you have to consider tire size, weight, type of driving, driving conditions, front drive shaft. Most importantly keep in mind it's a 4 wheel drive SUV that isn't made for optimum mpg performance.

A typical tune up includes spark plugs, air filter, fuel filter, spark plug wires, distributor cap and ignition rotor. That is what id go with typically.

lock at our tail pipe is it clean pass our finger in it if it black you have too mush fuel not burning it good but if you did a full tune up that the first step in the morning do you have hesitation maybe dirty injector the stuff some people put in the gaz tank is ok but nothing running the engine with fuel injection cleaner good luck p.s iread some the expert personnelly i hate when customer ask a question like our and get redirect to a web site how to drive our car sorry about that from montreal cheers .pierre

If you have already done a turne up and have not noticed any difference in mileage make sure the EGR valve is working and the EGR valve passage is not clogged. Alot of cars build up carbon deposits in this area and even if your EGR valve is working it will not be recirculating the exhaust gas enough. The purpose of the EGR valve is to recirculate the unburned gas from the exhaust and draw it back into the combustion chamber with fresh air and fuel. This will improve your gas mileage because you are richening up the mixture and makeing the ECM call for less fuel. This also cools the combustion chamber and reduces combustion chamber temperatures which will allow for more are. This is one of the most overlooked devices which can greatly decrease gas mileage when not functioning correctly because the ECM will try and make up for the lean condition and call for more fuel. Test the EGR valve with a vacuum pump and make sure it is working. If it is pull it off and make sure the 2 passages are not clogged with carbon. If they are you can usually clear them out with an old coat hanger. I would also take it in to a shop and have them clean the fuel injectors. The way they do it is pull the fuse to your fuel pump and fill a can mixed with gas and sea foam that screws into the schrader valve on your fuel rail. Then they used compressed air to build up fuel pressure and run your car for about 5 minutes on the mixture. This will blow out any debris or corrosion inside and on the tips of the injectors. When the injectors are clean the ECM will have more precise fuel control. Keep me posted. If you have any other questions let me know.

One other thing to remember is when engines get alot of miles on them the clearance between the cylinder walls and piston rings begins to loosen and you dont have as tight of a combustion chamber which will cause compression loss. This can cause a drop in gas mileage the worse and worse it gets. You could run a compression test to rule this out. If you go to most chain auto stores that have a loan a tool program you could rent a compression tester and test each cyilinder. Basically you unplug the spark plug 1 at a time and replace it with the compression tool. Then you start the engine and check the pressure. Turn the engine off and move to the next cylinder. They should all be within 10% of each other.

Thanks - Tech101

compression and clean surfaces are key for a vehicle of this age. I'd suggest that you consider an engine internal coring out, if you really want to improve this one. There are no short cuts.

You are right about one thing. Your gas mileage is too low for your vehicle make and model. Unless you have the 6 Cylinder, 3.4 Liter, Automatic (4 speed). That vehicle averages between 13-15 mpg.
It sounds like you have already done many things to your car to improve mileage. Air filter, spark plug, fuel injectors and tire inflation have a lot to do with it.
I recommend this site for driving tips to help increase fuel economy: http://www.opentravelinfo.com/travel-guide/uncategorized/how-to-save-money-on-gas-29-tips.html

Can you give me more specifics on your engine and transmission?
Thanks,
Ken

Most of the vehicles today need a tune-up every 50,000 to 65 miles depending on driving condition,going to checked air filters ,oil filters. I give you site more information about tune-up..
http://carpros.com/how_to/how_to_tune_up.htm

Hi,

Have you had a major tuneup? Doing so would have your car's computer scanned (OBD code reader) to identify potential problems or failing components that contributes to the 11 mpg. Most components that affect mileage can include: air filter/cleaner, fuel filter, O2 sensors, catalytic converter, timing belt (slack), fuel filter, throttle body mouth, PCV valve, air control valve/throttle position sensor/MAF, idle air control valve and EGR valve. As you can see, quite a number.

A couple of ideas that can perhaps help improve on your mileage after a major tuneup:
1. O/D off;
2. use the ECT power switch;
3. don't manual override the A/T;
4. A/C off when not necessary;
5. use 87 octane fuel (you can also try a little higher, 89?);
6. no fuel mix;
7. reset the car's CPU so as to learn new your driving habits.

Hope this be of initial help/idea. Pls post back how things turned up or should you need additional information.

Good luck and kind regards.

Thank you for using FixYa.

it may be becoz of ur drivin conditions the mileage s dropped down...... Can you be more specific?

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dont forget to rate this solution

you should check battery and fuse in your car

its may be due to your driving problem