Sounds like some sort of intake sensor issue. Someone else will chime in shortly with much better info though, as my version of an intake is just slapping a cone filter onto the stock tubing, lol.

 

Did you reset the ecu after switching?

Did you change the filter? You may be getting the MAF sensor oiled up and dirty.

You may have gotten some bad gas.

Why are you running mid and high grade gas anyway? You only need 87 unless you do forced induction or get an upgraded ecu with advanced timing.

Woo Hoo... another WoT fan.

 

i had similar problems in my tib..

turned out one of my couplers came loose off the throttle body...and it was leaking...

it would even stall at idle..and it was a really bumpy ride....car was studdering a lot....

 

lmfao....i started running premium because i can afford it (and becuase ive always ran it in all of my cars) and yes i know that you dont gain a butt-load horsepower and the like by just upping the amount of octane...i just do it....

 

You don't gain any hp. Your engine my run a faint bit smoother.

 

thanx seedweed....ill go look into seeing if i have any leaks

but like i said...i went back to premium and it works fine now....im gonna let it sit for the night and check tomorrow

 

See the link in my signature. Unless you have F/I or a tuned computer, buying octane higher than 87 is just a waste of money.

 

See the link in my signature. Unless you have F/I or a tuned computer, buying octane higher than 87 is just a waste of money.

:3_withstu

And read this directly from Hyundai:

 

its not that much of a waste lol 10 gallons of regular at 2.85 is gonna cost $28.50 and 10 galons of mid at 2.95 is going to cost $29.50 and 10 gallons of premium at 3.07 is going to cost $30.70 i think thats self explanitory lol

 

Hahahahaha good one

 

well two bucks for 10 gallons, 4 fill ups a month, thats 8 bucks... over a course of a year, its about 100 bucks difference....

and yeah, i thought lower octane actually combusted sooner vs the higher octane that doesn't, hence the use in FI to prevent premature detonation. Or am I completely wrong?

 

Octane rating of fuel is only its resistance to detonation. It doesn't add power or burn different. Higher octane just resists pre-ignition combustion.

What adds power is not the fuel but the added cylinder pressure (from forced induction, higher compression, valve timing change) or advancing the ignition timing. However, doing those things will cause pre-ignition on lower octane fuel. So to prevent it, higher octane fuel is used.

 

... Look at the price difference of Premium vs Regular....it's like a $3 difference for an ENTIRE tank. If you fill up once a week that's $12 whole dollars a month! If you drive your car alot or race it you're probably doing an equal amount of wear and tear on the car (engine, tires, etc). So why not go Premium? Just something I came to realize last year. Don't forget that most Premium gasoline comes with cleaners, which will help keep your car running better over it's life time. So that extra $3 IS doing something!

 

All grades come with cleaners and detergents.

 

i know that higher octane is not going to boost HP...sorry if what i had posted earlier was misleading....ive always put high octane in my cars (thanks to a 3000gt i owned) and right now the reason i keep doing that is because when i get paid i fill up my wifes 01 turbo beetle, and then when she gets paid she fills up my tank...its kind of an even exchange....i know that our cars run fine on lower octane (87). Plus im preparing myself for the gas prices when i go turbo this christmas holiday!!! :3_winkthu ...and dont worry i wont be another charles :3_shiny:

 

dont make fun of me.....im poor sometimes

 

I'm poor ALL the time.

 

Put it into a seperate savings account as a f/i fund.

 

yeah, its not so much the fact that you're spending a few extra dollars a month on gas, its that in general, that kind of thinking can cost you a lot more in the long run. granted, you are going FI so it kind of nullifies the point, but paying attention to finances is very important, more so than a lot of people treat their finances... lol

Me, I'd love to have the extra 100 bucks at the end of the year... too bad i already use regular and pinch pennies as much as i can... lol

 

My Tib loves Chevron 87:3_winkthu

 

funny story my company put in new tanks at a gas station we put in two of them so i asked the owner of the station ,why only two tanks ( not like they have baffles splitting them )and three grades of gas he just laughed and walked away ,i know gas stations get regulated and tested but that just made me uneasy lol ...

 

Because the mid-grade pump blends the regular and premium from the two tanks together before putting it through the nozzle.

 

87 may be fine to run, but when I ran it I threw a CEL for a lean code, I switched to premium gas and the CEL has not come back ... *knocks on wood* ... so I'm not sure if it was due to the gas, or due to the fact that I just added the Stage IV IM.... either way I can't see how either of the 2 changes I made together would rid that stupid CEL, but they did so I'll stick with them!

 

i think it was a vacuum leak....between the MASS and TB...its running fine now

 

I'm not sure, as I never removed the TB from the IM beforehand.... either way all is good now, so I'm happy with it!

 

higher octane actually can cost power due to the lack of combustion flashpoint

 

how come some cars say they neeed 93/premium tho, i remember on my last car (RIP 02 gt eclispe) inside the gas lid., it said that the car has to run on 93 only

 

See post #14 above:
http://www.newtiburon.com/forums/showthread.php?p=2261420#post2261420

Octane rating of fuel is only its resistance to detonation. It doesn't add power or burn different. Higher octane just resists pre-ignition combustion.

What adds power is not the fuel but the added cylinder pressure (from forced induction, higher compression, valve timing change) or advancing the ignition timing. However, doing those things will cause pre-ignition on lower octane fuel. So to prevent it, higher octane fuel is used.

Cars with higher compression, more agressive timing or F/I require higher octane to prevent detonation.

 

We have a fairly high compression... aren't we at 10:1? I'm too lazy to look it up. If we are 10:1, then our timing must be retarded to hell.

If I've got some wires crossed with a different platform and we're not at 10:1, please kindly disregard my temporary moment of stupidity. (I know it's not temporary, but don't shatter my illusion please)

 

Yeah our cars are 10:1. I run premium in mine but my ECU is reflashed with a 91 octane or higher tune.

 

AFAIK, the Beta II is 10.0:1.

 

And to clarify... I'm not making a point for running higher octane, I know it's not needed. I'm just wondering if our timing is retarded that much to allow us to run on 87, or if it's something else, or a combination. Because a lot of other cars at 10:1 compression do require 93 or higher.

My same stupidity disclaimer from my last post also applies to this one.

 

Color me cautious, but I run 93 on mine because of my setup. A few members have thrown minor misfire CEL's with cams. As an ounce of prevention, I pay an extra two dollars per tank. It's no big deal to me.

And to clarify... I'm not making a point for running higher octane, I know it's not needed. I'm just wondering if our timing is retarded that much to allow us to run on 87, or if it's something else, or a combination. Because a lot of other cars at 10:1 compression do require 93 or higher.

My same stupidity disclaimer from my last post also applies to this one.

We drive a value branded car with 172 bhp - what do you think? Yes our timing is conservative from the factory.

 

To be simple;

Yeah the V6 is 10:1, but the design of the heads, "low the compresion" thats why you can add 14psi on stock timing (obvious with higher oct fuel) etc etc