car running weird after fill up

WLJohnson05 · July 2nd, 2009, 03:32 PM

its been doing this for a while and i cant figure out for anything what it is. after putting gas in the car (whether its a lot or a little) it still runs rich and will fumble over itself at idle. drives fine but still stumble a good bit for about 4 or 5 minutes after putting gas in the car.

i've tried getting gas at the same place several times, getting it different places, etc. but it still does it.

once that 4 or 5 minutes is up it gets itself straight and doesnt do it anymore but for some reason right after i fill up it runs bad. any ideas?

6er_w/a_Vengance · July 2nd, 2009, 04:13 PM

b4 you said you went to different places i almost thought you accidently put the highest grade in there and maybe something was just off from it....sry johnson im not much help right now

goren420 · July 2nd, 2009, 04:16 PM

Weird that it runs fine after a few minutes...I mean beyond your tune (I'm not much help in that area) I would go over everything fuel related, filter, lines, injectors (clean & functioning)... but still odd if it were one of those that it's no issue after warming up. That's a tricky one.

Lind · July 2nd, 2009, 04:32 PM

well when you open your gas cap its releasing all that pressure that was inside the tank, after 5 minutes it builds it up again and starts working fine, that would be my guess

goren420 · July 2nd, 2009, 04:34 PM

^ But does this happen to your car? Not mine, so I wouldn't just pass it off as normal function, pressure should build up again rather quickly when restarting.

Lind · July 2nd, 2009, 04:39 PM

also id try throwing a bottle of heet in it, you could possibly be mixing everything in the bottom of the tank with the new gas, you might have alittle bit of water in there that sits on top of the gas like little bee bees and are getting sucked in

Lind · July 2nd, 2009, 04:40 PM

Originally Posted by goren420

^ But does this happen to your car? Not mine, so I wouldn't just pass it off as normal function, pressure should build up again rather quickly when restarting.

thats what im saying, his might not be building up as quickly as most cars because his cap might not seal tight or he might have a slow leak some where

goren420 · July 2nd, 2009, 04:49 PM

^ Ok I got you now, it seemed like you meant it was just normal, but a leak is indeed possible, why I said check all fuel components, still an odd issue.

WLJohnson05 · July 2nd, 2009, 08:58 PM

Originally Posted by Lind

also id try throwing a bottle of heet in it, you could possibly be mixing everything in the bottom of the tank with the new gas, you might have alittle bit of water in there that sits on top of the gas like little bee bees and are getting sucked in

thas kinda what i thought that there could be something in there acting up along with the gas. as far as i know there are no leaks. i mean it goes rich for i would say that its plenty fuel. the water thing might be it. not sure how it would have gotten water in but that kinda makes sense. how much of that heet are you supposed to put in? and is that stuff still safe for the turbo.

GreenFaleen · July 3rd, 2009, 12:16 PM

are you going places that sale that ethanol crap? I know my tc stumbles for the first little bit after getting premium from those places no idea why but after 5 or 6 mins its fine

WLJohnson05 · July 3rd, 2009, 07:53 PM

Originally Posted by GreenFaleen

are you going places that sale that ethanol crap? I know my tc stumbles for the first little bit after getting premium from those places no idea why but after 5 or 6 mins its fine

yea i cant find places without it. but that sounds like my problem ecept the stumbling is pretty harsh

BlackedOut04GT · July 3rd, 2009, 08:18 PM

Have you tried takeing the fuel cap off then putting it back on to see if it still does that? Try that, and check the fuel cap for any damage.

GreenFaleen · July 3rd, 2009, 11:51 PM

Originally Posted by WLJohnson05

yea i cant find places without it. but that sounds like my problem ecept the stumbling is pretty harsh

yeah mine is too feels like a bad vacuum leak or a nasty misfire my shop just said it takes a bit for the PCM to figure out the e-10 based fuel

WLJohnson05 · July 4th, 2009, 01:09 AM

Originally Posted by GreenFaleen

yeah mine is too feels like a bad vacuum leak or a nasty misfire my shop just said it takes a bit for the PCM to figure out the e-10 based fuel

yea exactly...hmm so i guess its really nothing i can do about it if its that...just have to search for the better gas

July 2nd, 2009, 04:13 PM	#2
6er_w/a_Vengance Sonic Blue FTGDMFW!!! 2004 Mustang v6 10.73 1/8th mile Join Date: Apr 2007 Location: Portland, TN Posts: 3,560	b4 you said you went to different places i almost thought you accidently put the highest grade in there and maybe something was just off from it....sry johnson im not much help right now __________________ 2004 Mustang 3.9 v6 K&N - True Dual Thrush Welded Exhaust - 5k HIDs - Show car shine 24/7 Fuckers

July 2nd, 2009, 04:16 PM	#3
goren420 Hardcore Enthusiast '00 3.8L Join Date: Apr 2008 Location: Odessa, FL Posts: 1,154	Weird that it runs fine after a few minutes...I mean beyond your tune (I'm not much help in that area) I would go over everything fuel related, filter, lines, injectors (clean & functioning)... but still odd if it were one of those that it's no issue after warming up. That's a tricky one. __________________ "Fast she goes...in the city of Overdose"

July 2nd, 2009, 04:32 PM	#4
Lind Enthusiast 1994 Ford Mustang GT Join Date: Sep 2006 Location: Shawano, WI Posts: 552	well when you open your gas cap its releasing all that pressure that was inside the tank, after 5 minutes it builds it up again and starts working fine, that would be my guess __________________ My Daily Driver

July 2nd, 2009, 04:34 PM	#5
goren420 Hardcore Enthusiast '00 3.8L Join Date: Apr 2008 Location: Odessa, FL Posts: 1,154	^ But does this happen to your car? Not mine, so I wouldn't just pass it off as normal function, pressure should build up again rather quickly when restarting. __________________ "Fast she goes...in the city of Overdose"

July 2nd, 2009, 04:39 PM	#6
Lind Enthusiast 1994 Ford Mustang GT Join Date: Sep 2006 Location: Shawano, WI Posts: 552	also id try throwing a bottle of heet in it, you could possibly be mixing everything in the bottom of the tank with the new gas, you might have alittle bit of water in there that sits on top of the gas like little bee bees and are getting sucked in __________________ My Daily Driver

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July 2nd, 2009, 04:49 PM	#8
goren420 Hardcore Enthusiast '00 3.8L Join Date: Apr 2008 Location: Odessa, FL Posts: 1,154	^ Ok I got you now, it seemed like you meant it was just normal, but a leak is indeed possible, why I said check all fuel components, still an odd issue. __________________ "Fast she goes...in the city of Overdose"

July 3rd, 2009, 12:16 PM	#10
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.9@103/8.9@81 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,788	are you going places that sale that ethanol crap? I know my tc stumbles for the first little bit after getting premium from those places no idea why but after 5 or 6 mins its fine __________________ Scion Tc-going turbo MM 4 Banger club: Senior Ricer buy my nitrous http://www.moddedmustangs.com/forums...-kit-sale.html "Horsepower sells cars, torque wins races." -Carroll Shelby

July 3rd, 2009, 08:18 PM	#12
BlackedOut04GT Enthusiast 2004 Mustang GT 14.61@96.03 2.159 60' (Was my first/best pass. So far.) Join Date: Sep 2008 Location: Maynard, MA. Posts: 769	Have you tried takeing the fuel cap off then putting it back on to see if it still does that? Try that, and check the fuel cap for any damage. __________________ Black Stang Crew #7

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