Hi.
I have a 96 I30 which is 130k on it. I've been in New York in this summer. It was 2000 miles trip. At that time the MPG on the highway was over 400 miles per 16 gal. After the trip, the MPG is dramatically dropped from 330 mile(city) to 230~250miles. I used to drive the same distance and time with alway shell premium fuel (Oct 93). I have no CEL at all. Even though the car had a oil leak problem inside the spark plug wells, it made more than 400 miles per 16 gal. The problem was fixed after the trip by myself. In addition the car have the hard to start problem befor going to the trip though.


Here is list which was replaced on new spark plugs(NGK), air filter, fuel filter, new igniton coils, and cleaned T/B and IACV with new gasket. Because the car has hard to start problem when the enigine is hot.

 

I doubt this has anything to do with it. But when it gets colder outside gas stations change to a winter forumula. Some cars do better with this formula, while others are effected negatively. I do not know much of anything about cars so you best wait till someone who knows more than me comes along.

 

say hello to winter blend gas! Same price for ****tier crap. That or you got a bad KS which wont light the CEL when gone bad.

 

gas in oklahoma just went up 30 cents a gallon, and the ks throws a 0304 code and your cel will come on

 

i ahve a bad egr and sumtimes the cel is there and sometimes it is not.

 

You might wanna try and run the grounding for your starting issues there is a thread on here about it i just don't feel like looking for it. I've got the same poopy miles though i'm getting 230-250 but it's probably because of my starting problem not really sure though who knows

 

Wrong.

 

I love it when n00bs spew misinformation with such confidence.

 

Take your foot of the floor!

 

what fun is that ?

 

i love it when noobs like yourself talk ****, am i wrong about the code???

it's in the sticky's

 

You're right about the code itself, but not the presentation.

P0325 will not illuminate the CEL.

 

Check for ghost codes like the KS, (which DOESNT light the CEL)
Ground that starter and tranny(we still need a sticky) *hint hint
It's possible you just got some crappy gas / crappy winter gas that had been sitting in a '91' tank for so long that it lost its octane potency.
IMO, its WAAY to early to tell if you're mileage just dropped exponentially, you're basing it on highway vs. city mileage, and on what appears to be 2 consective tanks.
not reliable results.

 

Um, I get 250 miles per tank tops, mixed highway and city. Guess I'll check my knock sensor.

 

how long has this been going on? I got the impression from your post that this low mileage just appeared, have you been through a few tanks already to get an accurate mileage?

 

It was from the middle of August in this year. I feed the gas tank more than 10 times and I'm a full time student so the car is drivinig exactly the same distance during the semester. I'm pretty sure the low mileage.

 

well I'd pull for ghost codes,
search for all the usuals, mileage has been covered you'll find all you need to know.
basics are fuel filter, air filter, cleaning TB, IACV, etc.
a good search will yearn results man.

 

buddy, don't get cocky. Just accept the fact tha YOU're WRONG about the CEL. Read the sticky more carefully and listen to those with EXPERIENCE.

Btw, i've been here longer than you, n00b

Thank You TunerMaxima3000 & pmohr for the constructive coments.

 

holy slow down junior take it to pms

 

i'm done...and he started it

 

Ever since I bought the Max in May. I've ran 89 for at least 4-5 tanks, and then 91 for a whole month. Before I replaced the bad MAF and cat I've gotten about 200 per tank. Now it's slightly better...if it's all city I'll get about 210-230, but I've gotten as high as 280.

Is it true that the CEL will always be lit with a CAI? When I had my codes checked it threw a o2 sensor code. Previous owner replaced the sensors about a year and a half ago. My driveability seems to be fine though. Once in a blue moon it will shut off on me. Happens about once every 2 weeks at a stop. Other than that everything seems fine except the mpg.

 

Your gas mileage sucks big time!!!! I'm getting around 390 with mixed highway/city.

 

how mixed?

 

Try to see if there are any other codes that pop up with CEL. If you car stalls on you, than you may have MAF or CPS issues.

 

I'm getting about 15MPG driving in the 2-2.5Krpm range (with maybe 1 WOT session per tank). But i'm 100% city and my trips are 7-15 mins long with lots of starts/stops, so i hope that makes sense.

 

same as me man. i work 5 miles from where i live. there are 6 lights in those 5 miles. im gettin about 280 to a tank. but my KS is dead.

 

lol, yeah. With the heat on, the darn thing gets fully warm pretty much as i pull into my parking spot, which means that i'm running ruch for at least 80% of the trip .

...and that's with a clean fuel system, fixed vaccum leaks, new KS, and a new thermostat.

I can't really complain though, i only need to gas up 2X a month.

 

go back to kindergarden lol jk,

so is it true about the CAI throwing a code all the time??? what code does it throw, an o2 code?

and i bought a ks from courtesy nissan for 145.00 but the sell them for like 60 bucks on ebay, but i think it was well worth it, cuz when i pulled my old one out i realized it was busted into about ten peices, and the new one made alot of difference in normal driving conditions to me at least, it felt smoother

 

65% City and 35% Highway

 

i 2nd "jvckustumz" driving experience with the new KS (totally worth it). I dunno how a CAI could throw codes all the time unless the the IATS or the MAFS were getting funky. I'd say he needs to spit out all the codes that are stored.

 

get those *****es lol !!!!!!!!!

 

word around the campfire is that the 65 dollar ebay japanese generic one isnt that reliable - some people have good luck and some dont. and considering its a computer relay mechanism i figured it would be better to spend the extra 50 bux to get the nissan OEM one from dave b at south pointe..

 

better safe and pay 145 than 60 then 145 when your ebitc one fails

 

At 155K miles, My CEL went on and I had AutZon pull the code. It came up as the KS. I got them to reset it (though they were not "supposed" to do it). The person that did it said it would probably come back. It did in about 15 days.

I changed the KS and the CEL went out after about 2 weeks of routine driving.

Until I changed it, (used the fleabay unit for $60) my mileage was awful & I was getting about 250 miles a tank.

I'm not arguing with the info above and I'm no newbie. I'm just sharing my experience.

 

Thanks for sharing your experience, Double E . In my experience though, i've had the KS code stored the computer without setting off a CEL until i asked my mech to just scan the ecu, and the code came up. Most folks on this board say that the KS code doesn't set off a CEL until there are other codes in the ECU that do.

 

 

I asked to replace the KS to ebay seller. He , of course, doesn't want to do that.
He told me check spark plugs, filter, fuel injecters, and etc... So I already did everything.

Thanks.

 

Did you also check the wire that the KS connects to for continuity to the block?
Torque the KS bolt well enough?

I would check the above & clean the area where that wire attaches to the valve cover area.

I'm surprised that the KS was bad so quick... Edit: I just realized that I didn't go through e-bay to get it. I believe it was another source but still about $60

I guess it may come down to getting another one and installing...for which you truly have my sympathies.

 

yea it was rockauto that has it for 65.17

 

KS code wasn't thrown. It was o2 sensor. Will go back and get the codes run again. When I heard some of you are getting 350+ on a tank I almost creamed my pants.