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1979-2004 V6 Mustang Tech Discussions

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Unread 06-11-2008   #1 (permalink)
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Default 1999 Mustang V6 tune up questions

Ok I have a 99 v6 I started a tune up on since I was getting 16-17 mpg

I have changed the plugs
Air filter
Oil & filter
Checked the belts

While doing this I saw a lot of build up on the plug tips and that my tail pipe had a lot of carbon build up so I changed out the spark plugs in the hopes of bettering the mpg

But at my last fill up my idle is shaky and the mpg was 14.7

I do not horse my car and my driving style has not changed the only thing that is different is I used shell gas instead of Exxon like I normally do or just got bad gas not sure

So now that I have told you guys all that
Is there something I missed in my tune up?
Or
A way to fix this running rich
I know a number of v6 mustangs out there get around 23mpg and I would like to get my car at that level

Any help with this would be great

Thanks

Oh and the car is totally stock as far as I can tell I have not done anything to it an donít really plane to
Might put duel exhaust and an intake one it one day
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Unread 06-11-2008   #2 (permalink)
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You and I are in the same boat. I've been getting in the 15's for a while, and started replacing things. Try replacing your fuel filter, check your tire pressure, (I know, it's a no brainer, but you never know) Maybe give your inside a good old cleaning with some seafoam. Check your PCV valve, it may need cleaning.
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Unread 06-11-2008   #3 (permalink)
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Oh, and about the intake..I finally bought a $70 one from americanmuscle, and I'm getting about two miles to the gallon better.
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Unread 06-11-2008   #4 (permalink)
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i did think to check those they all have 32 psi i am going to nock them up the the owners manual recomendation

i did not think of changing the PVC thanks i just got the car in jan of 08 so i dont know if t was ever changed

also checked the plug wires they look good to
since the plugs were caked up i am going to put some seafoam in the tank and in the pvc to hopfuly clean any crap out thanks again
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Unread 06-11-2008   #5 (permalink)
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If the idle's rough, think back to your work first. Did you gap the spark plugs correctly? Are all the fuel lines tightly attached to the fuel filter? Did you tighten drain plug enough? Is the oil filter tight? Oil Filler cap on? Air Filter placed correctly?

If all of the above is yes, move onto the fuel pump. That's the main cause of stumbling for our cars.
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Unread 06-11-2008   #6 (permalink)
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Quote:
Originally Posted by guitarist9008 View Post
Oh, and about the intake..I finally bought a $70 one from americanmuscle, and I'm getting about two miles to the gallon better.
Just put one in as well, I gained 1 mpg (or thereabout).
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Unread 06-11-2008   #7 (permalink)
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Quote:
Originally Posted by Falcon453 View Post
Just put one in as well, I gained 1 mpg (or thereabout).
I have a cold air intake with dual exhaust and I am currently doing around 23-24 mpg on the highway, its definitely a good investment especially with gas prices not coming down any time soon.
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Unread 11-26-2008   #8 (permalink)
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i know how you feel i am only getting 14 miles per gallon.. i got about 310 KM last tank which was about 190 miles.

i have new CAI, so its not the filter.
i will check out fuel filter/fuel pump which is prob pricey?

i just looked up PCV valve to replace and it seems easy enought to replace so i will also do that... if i do all this will this help my gas problems?

at first i was gettin about 450 km per tank.then dropped slowly once i noticed it.
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Unread 11-27-2008   #9 (permalink)
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please correct me if i'm wrong, could a fault with the EGR be causing a lot of what he was describing?
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Unread 11-27-2008   #10 (permalink)
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so you think it is the EGR?.. cost only about $50.
i just replaced PCV valve since old was alittle clogged.
my spark plugs looked pretty clean.
i was told by a mechanic it would not be a fuel pump, a fuel pump wouldnt give signs, it would just give out.
fuel filter could be another thing i shall replace. anyother comments i am glad to hear. thanks mike.
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Unread 11-27-2008   #11 (permalink)
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worst than i thought im only getting about 12.6 MPG.
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Unread 11-28-2008   #12 (permalink)
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everybody experiencing bad millage problems which i gave 12.6 MPG.. before you replace anything expensive try Fuel injecter cleaner. and spray throttle body cleaner in the Throttle body(open up the butterfly) and also try EGR valve ifnot needing to be replaced.
these seemed to help my problem from results i see right now.
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Unread 12-16-2008   #13 (permalink)
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not sure i now think i got bad gas
mpg is now up to 19.5 and 22 depending on city driving

anyone ever had their oil gauge dance? mine flickers every now and then at idle
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Unread 12-17-2008   #14 (permalink)
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I know shell uses that ethonal or whatever it is and has been known to cause problems with engines and mpg. Maybe thats what It was.
 
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Unread 12-19-2008   #15 (permalink)
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Hi,

i use shell for gas. Is it true it gives bad mileage?

thanks.
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