I have read the bottle and I was jsut wondering if any one has done it and had any tips.

 

look through the seafoam thread. ALL answers are in there and results and everything you would ever want to know about the stuff. its a long read but it will comfort you in your nervousness!

its very straight forward!

 

My milage also seemed to suck as soon as we got the first cold snap. 290km per tank!!! This last summer I installed the dackplate, true flow air filter and M.I.T. I also changed the diffs, transmission, transfer case, and engine all to amsoil synthetic, with an amsoil oil filter. 2 tanks ago I cleaned the MAF without much change. I just changed the engine oil, and sent it in for analisys, everything was good except they found fuel in my oil, and they recomended cleaning my injectors. I have heard pro's and cons about seafoam, so I am waiting for them to finish building my dealer so they can clean my injectors. Could dirty injectors cut my milage from 500km a tank to 290 km a tank?

 

It could be where you bought gas. Find a gas station that has good fuel and you get good mileage from.
There's a name brand station here that I've consistently clocked 2-3 mpg less when using their gas. Needless to say, I don't buy gas there anymore.

 

Mass Air Flow Sensor

 

ok so i have been reading a lot of older threads, this one included, and i see so much about winter grades of gas. myself i have never heard of anything like this, infact, i record the same mpg in the summer as the winter...sorry this was off topic

back on topic...so you did a tune up, and are now gettin worse gas mileage...hmm...you said you put in new plugs, first off what brand? second did u gap them correctly. also when you pulled your old plugs what did they look like, black and covered in soot, a little black with some white, or all white. did they smell like fuel? etc

another thing to think about your cat and o2 sensors. i would probally clean your intake piping, throttle body, and run the seafoam(i did it, didnt notice a huge mileage increase, but it did what they said it would do)

 

Pulled 220 miles on 15.8 gallons, so there has not been any improvement. The car runs so smoothly I dont know what else it could be. 14mpg is definetly not what this 4runner should be getting, especially when I rarely even hit 2500 rpms when accelerating.

the plugs were gapped correctly, they are the NGK iridiums, bought them after hearing good things on this forum about them. When I pulled my old plugs they didnt look that bad at all, seem to have a proper burning fuel ratio.

Any other ideas would be helpful.

Thanks,
Jeff

 

Your mileage isn't unusual considering it predominantly city driving. Short distances, stop and go driving, cold engine...all contribute to low MPG's.
Is your concern predominantly because your "new" mpg's are lower than your pre tune-up mpg's or are you thinking both before and after #'s should be higher?

 

I have talked to many people who get an average of 16-19 all city and i'm just trying to figure out what else I can do to get better gas mileage.

 

Where do you live?

 

Virginia Beach VA I do alot of stop and go driving in the city.

Jeff

 

have you cleaned your MAF? i was getting around 200 miles to the tank before i seafoamed and cleaned the MAF, now im getting around 240-260 per tank

 

I will give that a try tomorrow thanks for the idea.

Jeff

 

Doenst it get kinda cold there? cold air = more dense = more fuel...

 

not that cold, its been high 50s the last week or two.

 

I was getting around 14-15, and then i replaced my 02 sensor and now i am getting somewhere around 18.5, and thats with out a thermostat, so it runs pretty rich in the mornings.

 

Both o2 sensors have been replaced. I cleaned the maf today and reset the ecu, hopefully I see 250+ on the next tank.

Thanks for all the help guys.

 

how much were the o2 sensors?

 

around 100 a piece, got them from sparkplugs.com

Jeff

 

Any luck with the 02's? I replaced my front 02 sensor, but not the rear one in hopes of better mileage after my similar situation as yours where I have tuned up EVERYTHING to no avail.

Could it be the rear 02 sensor? I was under the impression that the front one was the only one that really mattered...I have also cleaned out the MAF with some electronic cleaner.

Currently getting around 190 per tank of 15 gallons.