Took my 07 Fit Sport with 86000 miles to the dealer and told them I was getting some hesitation in the engine and my mileage was way down from normal. They talked me into a transmission flush and a new serpentine belt and said the air filter looked a bit dirty. I installed a K&N filter right from the startand did the recharge at 50000. I did clean the filter it had some bugs in it. I asked if they could analyze the hesitation and they told me that if it didn't throw an error code they couldn't help me. Does that sound a little off to anyone else? What should I do? Thanks for your help.

 

How do you drive it? I mean what's your style? You may need to just go all out, balls to the wall for a while and clean off the gunk that may have accumulated on your valves from the nice driving that you probably do.

 

If you drive for mpg and are very easy on the rpm's then yes you need to add some Good injector cleaner Chevron works well and is easily found in auto part stores. Also the Mass air flow may need to be sprayed with a good quality cleaner. And top it off with a good oil change 5/20 blend and Wix oil filter. Change out the Transmision Fluid if it's A/T! With a good Synthetic This should be done every 30K in the Honda Maintience Schedule but I did it @12K and will do it again @ 24K with Amsoil Universal ATF. While ur @ it clean the air filter again. What is the air presure in ur tires and what type are they? Kinda New or on their last dance? The less tread height the more drag which ='s less mpg too. As you can see there might be more than one thing bringing down the mpg. Even washing and waxing helps mpg to a lesser %, it makes you feel good when see ur Fit.
I keep notes in the back of the owner's man on what I do and this helps in the time line what needs to be done next. But that's what I like to do, is mainteinice on D MzFiT.

How many miles "average" between changes? Long trips or quick/short trips? This makes a Big dif. in mpg. I get 25-30 mpg with "suburban" driving not city or hiway. Straight hiway mid 40's is the best I've seen (GD3 '08) loaded down with 4 people (2 under 100 lbs. and 2 shall we alittle over that ) and luggage 10K on the clock then.
Just my 2cents worth, hope parts of this help you get the mpg back were it was.

 

At 86,000 miles, I would go for valve adjustment -- but probably not from this dealer.

 

I would say there is a lot of ethanol in the gas and the season change is probably not helping. I would seafoam the engine and agree with selden to adjust valves.

 

I think the 4 first post have covered about everything and have nothing to add except, good luck to you.

 

Thanks everyone. I certainly have some things to do now to see if I can get her back to great mpg. i love this car.

 

Just to be clear the 07 Fit doesn't have a MAF, it's a MAP sensor.

I've had good results with the clear bottle Regane fuel system cleaner. Check your spark plugs.

As you've experienced, dealers don't do anything for you unless there's a engine code... and if there is one, they'll rob you to do the simplest things. Try and find a good mechanic around you if possible.

 

answers.yahoo.com › ... › Maintenance & Repairs MAF vs MAP
Thankx Koi

 

You should NEVER NEVER NEVER NEVER NEVER NEVER do automatic transmission flushes. It is a well-known precursor and cause of transmission failure. Also, I would bet you $5 they didn't change your ATF filter. ATF filter? I bet you they were too ignorant or didn't care enough to see if you had one, and they are ripping you off if they sold you a "flush" without changing the inline filter (please check and let us know).

Drain/fills with filter replacement are the proper way to do maintenance on honda A/T. See #5 below (your ATF filter is inline on the atf filter tube). You need to change that NOW unless they did it.


For better mileage, check:

1) tires - proper inflation and size (did you put on new or bigger tires recently?
2) oil viscosity- did you go to jiffy lube or a dealer that put in whatever they had in the barrel (I'd go with 0w-20 synthetic if you want the best mileage)
3) Unless noisy, DO NOT do a valve adjustment. Valves on the loose side are better than tight for engine longevity, emissions, and mileage
4) Don't go for fuel injection servicing- high risk of screwing up your ride or doing nothing. If you buy fuel injection cleaner, use a little less than recommended...not too much (it can screw up your emission system).
5) Have your spark plugs been changed yet? You might as well do them now if not. It cannot hurt (use OEM)
6) Do I sound jaded? Yes, I worked at an Acura dealer

 

have you heard of seafoam? i plan on doing that once i hit around 80k or so.

 

Personally, I'd ditch the KN for a stock filter. I never trust a filter I can see through and most engines don't deal well with the extra air. Too bad at your miles the damage is already done.

 

There is a lot of confusion on this page, 1st the 07-08 Fit doesn't have a maf sensor that came out in 09 with the i vtec 2. A kn filter is a great filter that will allow more clean air with out hurting the car. Most cars are air limited and having a less restrictive air filter will produce more power and can get better mileage because it produces more horsepower at a lower rpm.

 

I agree with your last statement only if the engine is designed to accept more air. Did you know the dirt that wears your engines is so small you can't see? I'd like to see someone establish a baseline oil sampling and do it again and watch the silica levels go up after the K&N was installed. To each his own but I'll accept the percieved lower power for an engine that will last and run as designed.

 

I like the performance gains I have gotten on motorcycles and cars with K&N filters but they are more porous than paper or oiled foam.... A trick I learned when I was into dirt bikes was to warm some STP and coat the air cleaner box and inlet to the carburetor or throttle body for added protection and as a means to see if dirt was getting past the filter... I coat my filters with oil and let it dry 2 times or 3 in the summer when there is more dust and sand in the air and have never been able to feel any that did on the intake inlet. K&Ns were never used by anyone I knew the raced on the close country motorcycle circuit because they don't filter as well as paper or oiled foam... A few years back K&N came out with a less restrictive foam than that of Uni filters to cover the cotton filters with for use in dusty environments...I always had confidence in the old oil bath filters but the didn't flow well and were terribly messy to clean and refill and oil would sometimes slosh out and into the intake when cornering hard or hitting big bumps..... If you have a K&N type filter it is a good idea to oil it between cleanings because the oil tends to dry out over time and they actually filter better when the are dirty.

 

Check out the spark plugs!! Denso IK22 if blown or have a lot of mods IK20 if N\A!! Even stock ones will be better then yours at 80+K miles!!

Marko!!

 

A map sensor uses vacuum and more air more vacuum. The engine is more efficient. I have ran a KN filter with no problems. I agree that dirt in an engine is bad, but Honda has a Ion oil seal which wont wear and the dirt will go into the oil and that what the oil filter is for. Oil can hold lots of dirt and changing oil every 3000 will keep the engine clean, Also the pistons are coated in Molybdenum disulfide which when the oil wears the moly coats all metals and will allow longer intervals between oil changes 5000-10000 compared to 3000. Also a good synthetic oil will allow even longer intervals. There is a old oil study at Synthetic Oil Life Study.

 

I'm guessing with 80k miles on your GD3 that you already replaced your tires. Did you use the same size of tires 195/55/R15? I noticed that when I replaced my tires with 195/50/R15, I can't get over 40mpg which I did get easily with stock Dunlop tires. The best I can get now with normal driving is about 34-36mpg and with a little hypermiling I can get 37-39mpg. Stock size tires is still the best.