3/4 gone and I've only driven 157 miles highway....
 

sh*t 3/4 of my tank gone and thats all I get for gas milage! this problem came back again.... it has come gone now for the last few months, usually I can tell because I will try to start the car, it fires up and dies right away, then on the second attempt starts right up but a little rough.

I think its either a coil or injector, everything else has been well maintained and changed by me. fuel filter, oil, plugs, wires...

how do I diagnose a bad coil exactly?

Sure you don't have any lead implants in your driving shoes? I know when I first got my 'ho I had the same kind of gas mileage. Perhaps its not mechanical, but the driver?

Also, checked the air filter recently?

I used to get 200 miles a tank in my RX-8 270 if I was easy on the gas. The longer I owned my alero I did find the millage dropped a lot but not that much.

AIT sensor mod? lol Eric gave me his and I was expecting to lose mileage...I'm actually getting better mileage now. I'd usually get 50 miles for a quarter tank with city driving...I'm up to 72 for that first quarter...so far.

Try a fuel injector cleaner. I used one and gained a few more mpg. Dirty fuel injector can kill too.

hmmm.... I use techron religiously, every oil change and some.


Its definately missing and running rich, but no codes. I once had a "too rich" code, but not recently, it still runs like shit.

Like I said, this was highway driving MPG NjRef511, meaning cruise control set at 70-74mph. Im not a lead foot driver either, and I said I take good care of my car.. I've had many times where I get 70+ per 1/4 tank - so I know its a bigger issue than that.

I hate this car, looks good. but man, for this gas milage I wish I woulda kept my jeep.

told ya. lmao. I'm far from a believer that this is a real performance mod of any sort, but once I set that up on my car, I couldn't bring myself to take it off. Mileage increases can be found on the 3400 aswell.

oh yeah...
WOT=watch the needle fall. lol

not to jack the thread at all of anything, but where did you find the ait sensor mod???

highway driving (consistently) I've found this to be true:

at 65mpg you should get 100 miles per 1/4 tank
at 75mpg you should get about 80 miles per 1/4 tank

city driving:
60-70 miles per 1/4 tank

if you want the mpg never go above 3000rpm

yeah... I should be getting ATLEAST 70miles per 1/4, and my car isn't coming close.

shitty thing is, the car is fine again now (for now..) this problem is very intermittant, it comes and goes. i can tell because my throttle gets a little shuddery around 2K when accelerating and the top end acceleration is total crap.


so, back on topic. what should I change first, coils or injectors?

Go to autozone and see if youre throwing a code

I think Eric found it on eBay. I think it's listed as on of those things that gived you "20hp" for plugging it in. there is a tad of a power gain (nowhere near 20hp...more like 1.5hp), but I noticed the mileage easily also.

dude that sucks, i ussually get like 100miles to my first quarter. then like 350-400miles to the tank. and all I've got is a civic intake, and use fuel cleaner once a month.

Possibly some Seafoam...excellent stuff