Bad Gas or what? - Mustang Evolution

Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang



Reply
 
Thread Tools Search this Thread
Please support our sponsors and let them know you heard about them here!
Old 01-17-2006, 10:00 AM   #1
Registered User
Newbie
 
greekstang's Avatar
 
Join Date: Jan 2006
Region: New York
Posts: 16
Question Bad Gas or what?

Hi all, so I have a 2004 3.9L V6, with 14,500 ML, I was using 93 octane gas for about one year, with no problems even when the empty light came on.

Now I have changed to 89 octane, and there is noticable knocking, you know like a can of marbles, this happens starting from a dead stop up to 10 15 ml. It realy sounds bad. It doesnt really become noticable until there is only a 1/4left.

First I tried the recomended 87 oct. but that knocked right away so then I went up to 89 oct. maybe there miss labled ( bad gas )?

I dont know what to do, have you guys experienced anything like this
Is this going to screw my engine up?
maybe I should go back to 93 octane?
I use Sunnoco gas in NY. anybody recomend Mobil or Shell?
greekstang is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-17-2006, 10:45 AM   #2
Legacy Member
Legacy
 
slvr2000stang's Avatar
 
Join Date: May 2003
Region: Illinois
Posts: 1,160
Re: Bad Gas or what?

All three of those are good quality gas.

Is your car stock, no chip or anything of that sort?
__________________
Custom Delk motor now DOA
2003 SVT Lightning #1059 of 4270
2000 Vert 4R70W
Only buy from vendors that test and stand behind their products
slvr2000stang is offline   Reply With Quote
Old 01-17-2006, 11:20 AM   #3
Registered User
Newbie
 
greekstang's Avatar
 
Join Date: Jan 2006
Region: New York
Posts: 16
Re: Bad Gas or what?

NO chip, only K&N filter with dual flowmaster, I'm putting in a 42% udp next week.
I drive the car like its stolen, you know hard. maybe thats attributing to it?
greekstang is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 01-17-2006, 11:55 AM   #4
Legacy Member
Legacy
 
Herbstang's Avatar
 
Join Date: Jan 2005
Region: Florida
Posts: 2,932
Re: Bad Gas or what?

That's a strange one Any chance you got some water in the tank ?? Did you try disconnecting the neg battery cable to reset the ECC Just a thought
__________________

Mods-K&N CAI , True Dual Flowmaster 40, BBK Ceramic Shorties, 3.73 , 25% UDP, 3/8 Phenolic Intake Spacer ,Steeda Tri-ax, SCT Chip/Dyno Tune

Quote:
"Some people are like Slinkies; useless, but fun to push down the stairs."
Herbstang is offline   Reply With Quote
Old 01-17-2006, 03:47 PM   #5
Legacy Member
Legacy
 
lowflyn's Avatar
 
Join Date: Aug 2003
Region: Mississippi
Posts: 19,890
Send a message via AIM to lowflyn
Re: Bad Gas or what?

There is a myth that running 93 for extended periods of time leads to the engine getting used to it. Actually..it's pretty true. Your computer has gotten used to running 93 octane, so the sudden switch to 87 could cause problems with the computer. I'd recommend resetting the computer by taking off the negative battery terminal for a few minutes, and the computer will relearn itself to the new gas. Kinda far fetched, but worth a try.
__________________
"I'm not driving too fast...just flying too low"
Mine:
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project-07 DSG Focus -DD
335
lowflyn is offline   Reply With Quote
Old 01-17-2006, 04:46 PM   #6
Registered User
Newbie
 
greekstang's Avatar
 
Join Date: Jan 2006
Region: New York
Posts: 16
Re: Bad Gas or what?

when i get home I'll try the battery, hopefully its an easy fix, BUT whats this about water in the tank ? what do you mean ? how ?
greekstang is offline   Reply With Quote
Old 01-17-2006, 06:36 PM   #7
Legacy Member
Legacy
 
Herbstang's Avatar
 
Join Date: Jan 2005
Region: Florida
Posts: 2,932
Re: Bad Gas or what?

Bad gas can have water in it But do what Lowflyn & myself suggested about thr ECC reset
__________________

Mods-K&N CAI , True Dual Flowmaster 40, BBK Ceramic Shorties, 3.73 , 25% UDP, 3/8 Phenolic Intake Spacer ,Steeda Tri-ax, SCT Chip/Dyno Tune

Quote:
"Some people are like Slinkies; useless, but fun to push down the stairs."
Herbstang is offline   Reply With Quote
Old 01-17-2006, 09:18 PM   #8
Legacy Member
Legacy
 
lowflyn's Avatar
 
Join Date: Aug 2003
Region: Mississippi
Posts: 19,890
Send a message via AIM to lowflyn
Re: Bad Gas or what?

For the most part all gas is mixed the same. The only time I'd really be worried is if there's a gas station selling gas for like 50 cents cheaper than anywhere else.
__________________
"I'm not driving too fast...just flying too low"
Mine:
-03 SB Cobra vert- 2552 of 5082 Born 02/25/03
Our's:
90 7up vert - new project-07 DSG Focus -DD
335
lowflyn is offline   Reply With Quote
Old 01-17-2006, 09:45 PM   #9
I liek gramer
Legacy
 
WhiteStang99's Avatar
 
Join Date: Jan 2004
Region: Florida
Posts: 8,537
Send a message via AIM to WhiteStang99
Re: Bad Gas or what?

gas will eventually over time turn into a nasty sludge and H20
WhiteStang99 is offline   Reply With Quote
Old 01-17-2006, 11:12 PM   #10
Registered User
Newbie
 
greekstang's Avatar
 
Join Date: Jan 2006
Region: New York
Posts: 16
Re: Bad Gas or what?

Guys thanks again for the usefull info, it started raining here so i didnt have a chance to disconnect the battery yet.
greekstang is offline   Reply With Quote
Old 01-18-2006, 01:31 AM   #11
Registered User
Regular
 
Brent's Avatar
 
Join Date: May 2003
Region: Tennessee
Posts: 11,873
Re: Bad Gas or what?

I seriously doubt that the computer has learned and gotten used to 93 octane.

If your car knocks with 87 something is terribly wrong. I would take it to the dealer, you still have your warranty right?
__________________

Reddit
Brent is offline   Reply With Quote
Old 01-18-2006, 12:04 PM   #12
Legacy Member
Legacy
 
Herbstang's Avatar
 
Join Date: Jan 2005
Region: Florida
Posts: 2,932
Re: Bad Gas or what?

............Using a higher octane then necessary is not only a waste of cash but can cause build up deposits that your engine can't burn. Which will lead to needed to run this octane to keep it from dieseling (running after shutting off the ignition)in the first place. (Deposits form causing hot spots, and pre-igniting the fuel before the Spark plug is suppose to.)Called detonation or pinging.

Remember Higher octane gas actually burns SLOWER or cooler then lower octane fuels. Using this will cause the fuel that is not being burned to build up in your heads,valves,pistons, etc...... So the trick is not what you think is best,but actually matching the octane to what your timing, ignition, and engine can actually burn in the compression stroke.

So instead of doing your car a favor by spending the extra cash , you might actually be causing more problems down the road.
Check This Atricle out

http://www.howstuffworks.com/question90.htm
__________________

Mods-K&N CAI , True Dual Flowmaster 40, BBK Ceramic Shorties, 3.73 , 25% UDP, 3/8 Phenolic Intake Spacer ,Steeda Tri-ax, SCT Chip/Dyno Tune

Quote:
"Some people are like Slinkies; useless, but fun to push down the stairs."
Herbstang is offline   Reply With Quote
Old 01-20-2006, 12:48 PM   #13
Registered User
Newbie
 
greekstang's Avatar
 
Join Date: Jan 2006
Region: New York
Posts: 16
Re: Bad Gas or what?

Ok now you guys have scared me, I hope I havent screwed my car up that bad.

I must tell you guys I have since filled up with 89oct. instead of 87 maybe the 87 is really 86 and so on?

the "can of marbles" only sounds for less then a minute at 10 - 20 ML, and it seems only to appear when i have been running the car non stop for over 2 hours. Other then that I dont hear anything, it does not happen all the time and when it does I get of the gas and re press and the pingning stops.

I dont know i really hate the idea of taking it to Ford and being without a car for a couple of days. BUT after you guys read this and still insist I'll get it checked out
greekstang is offline   Reply With Quote
Reply

Lower Navigation
Go Back   Mustang Evolution > 4 Cylinder | V6 | Classic Mustangs || Tech and Talk > Pre-2005 V6 Mustang

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
oiy, talk about bad gas mileage! whipster24 Pre-2005 V6 Mustang 25 01-06-2004 09:09 PM
Using 93 Octane gas is bad for my engine? Chonk Pre-2005 V6 Mustang 9 12-20-2003 05:18 AM

» Like Us On Facebook



07:54 AM


Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Content Relevant URLs by vBSEO 3.6.0

MustangEvolution.com is in no way associated with or endorsed by Ford Motor Company.