eating gas

R

Rushman04

New Member

Aug 11, 2003

42

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Jun 23, 2008

#1

• Jun 23, 2008

• #1

hey my girl drive a 95 v6 convert.and the thing just eats gas like its a big block. it will eat the whole tank in 170 miles and she drives like a old person. I have a K&N air filter in it thinking it was a clogged filter but that didn't help much. Iam looking for any suggestions on what it could be. Someone said it might be a intake manifold gasket. Iam not to knowlegeable about the 3.8 iam a 5.0 guy my self.

 

linkwpc

New Member

Apr 14, 2005

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Jun 23, 2008

#2

• Jun 23, 2008

• #2

how much mileage do you get anyways? I got 75000 on mine and it get about 18-19 miles to get the gallon.

 

ChingonStang

Member

Sep 19, 2004

308

0

16

Dallas, Tejas

Jun 23, 2008

#3

• Jun 23, 2008

• #3

Ugh, those are crappy mpg on your stangs. In my 04 v6 vert I get about 300 miles to the tank and thats with auto trans. Even on my 96 V6 5 speed coupe I was getting 325 miles to the tank and I had about 145k miles on it.

If she is driving like a old person, something is up.

 

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Rushman04

New Member

Aug 11, 2003

42

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Jun 23, 2008

#4

• Jun 23, 2008

• #4

i also forgot to mention that her engine light it on for no egr flow sensed. I replaced the egr valave and still comes on.

 

Mustang5L5

That is…until I whipped out my Bissell

Mod Dude

Feb 18, 2001

43,176

17,878

224

Massachusetts

Jun 24, 2008

#5

• Jun 24, 2008

• #5

Run the codes again?

COuld be O2 related, bugt a non-functional EGR would cause poor fuel economy


I have gotten 325 miles to a tank (all highway) on my GT..you should be able to at least get close to that too

 

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Rushman04

New Member

Aug 11, 2003

42

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Jun 25, 2008

#6

• Jun 25, 2008

• #6

iam going to do a couple of egr tests and see whats up. thanks

 

racefan966

New Member

May 21, 2008

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Jun 27, 2008

#7

• Jun 27, 2008

• #7

You said you replace the egr valve but how about the sensor. The flow sensor is seperate from the valve. There should be an orange silicone like vacuum hose hooked to it. After the catback and the Cold Air intake I am getting about 375 miles per tank

 

ChingonStang

Member

Sep 19, 2004

308

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16

Dallas, Tejas

Jun 27, 2008

#8

• Jun 27, 2008

• #8

racefan966 said:

You said you replace the egr valve but how about the sensor. The flow sensor is seperate from the valve. There should be an orange silicone like vacuum hose hooked to it. After the catback and the Cold Air intake I am getting about 375 miles per tank

Click to expand...

 

Skymarshal

Member

Nov 5, 2004

572

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16

Dallas

Jun 28, 2008

#9

• Jun 28, 2008

• #9

I get the same mileage- about 350-370 before the needle gets uncomfortably low. About 26-27 MPG in mostly highway driving.

Pull your plugs and see if they're black. That should at least tell you if you're running rich and then you can look for a sensor problem.

 

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Mustang_Belle

New Member

May 5, 2008

4

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0

Arkansas

Jul 21, 2008

#10

• Jul 21, 2008

• #10

just wondered if you ]found anything out with ur stang mine is runnin the same way! ive repalced every sensor and the egr valve still runs like ****

 

Mike97gt

it doe snot

Founding Member

Jan 26, 1999

10,633

7

89

the people's republic of massachusetts

Jul 21, 2008

#11

• Jul 21, 2008

• #11

Rushman04 said:

i also forgot to mention that her engine light it on for no egr flow sensed. I replaced the egr valave and still comes on.

Click to expand...

DPFE sensor/ EVR

the EVR is the regulator for the vacumm to the egr and rarely goes bad, the DPFE is the feedback sensor to the PCM and goes bad a lot.. another possible cause could be the egr ports, sometimes they plug up but you should have seen that with the valve off the car.

Most likely your problem is the DPFE as far as your check engine light goes..

You also need to watch her driving, even if she drives slow she could get poor mileage by not having a steady foot.. you don't want to be up and down on the gas pedal..

almost all fuel mileage concerns I see come into the shop that does not have the check engine light on is driver error..

I hate when I get these because it leads to a argument with the customer most of the time, atleast untill they see the difference on the IDS fuel mileage test with me driving compared to them.

A simple test you can do to see if the evr is working is to pull the vac line off the egr and rev the engine over 2500 or so, you should feel a tiny bit of vacumm, a gauge would work better for this but you can feel a very light vacumm.

 

Skymarshal

Member

Nov 5, 2004

572

0

16

Dallas

Jul 21, 2008

#12

• Jul 21, 2008

• #12

170 mi per tank sounds pretty bad even if she's driving like Mario Andretti. That's like 12 MPG for a car that's rated 20/26 or whatever that year is. Could dirty injectors cause such a drop? My mileage recently dropped to about 24 MPG from 27 or so, and after a bottle of fuel system cleaner it came back up to 26.
Could it also be an exhaust leak that is confusing the O2 sensors and causing extra fuel to be added?

 

M

Mustang_Belle

New Member

May 5, 2008

4

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0

Arkansas

Jul 23, 2008

#13

• Jul 23, 2008

• #13

Skymarshal....that 96 vert video is SWEET I thought I was gonna cry!

 

Skymarshal

Member

Nov 5, 2004

572

0

16

Dallas

Jul 24, 2008

#14

• Jul 24, 2008

• #14

Thanks Mustang Belle! I just had her out yesterday, and was getting looks and thumbs up as usual!