8 mpg?

[Orange]

99 Escalade, bought a few weeks ago. Just figured out my mileage, and I'm getting less than 8 miles to the gallon. And this is AFTER sea foam treatment! Truck has about 100K miles.

I know these truck suck gas, but before the escalade I had a 1997 2 Door Tahoe 4x4 with 150k miles and I was getting 14-16 mpg in same driving conditions. As far as I know, both trucks have the same 350 engine.

Any ideas as to why I'm getting such poor mileage? I know the two door tahoe was a few hundred pounds lighter, but I should be getting better mileage. Anything I need to check, clean, or replace?

 

[SunlitComet]

see post below for new graphic.

 

[Ceejkay]

dont know what sun was trying to do with that pic but have an idea. look into your fuel delivery. if you just got this truck a good tune up might be needed. good plugs, wires, dizzy cap, fuel filter ect. if you still have a problem the fuel spider might need to be replaced. i was getting 17mpg highway with cracked heads and a leaky spider.

 

[Gzes]

Do full service. For a good while i was getting 5mpg. I did full service including fuel filter. The filter is gonna be nasty since technically they are supposed to be replaced once a year or some ish like that

 

[okiemudslinger]

you may want to change you o2 sensor also.

 

[retorq]

8 MPG?! Quit bragging ...

 

[SunlitComet]

sorry about that

 

[SunlitComet]

Do full service. For a good while i was getting 5mpg. I did full service including fuel filter. The filter is gonna be nasty since technically they are supposed to be replaced once a year or some ish like that

incorrect.

---------- Post added at 01:17 PM ---------- Previous post was at 01:16 PM ----------

i was getting 17mpg highway with cracked heads and a leaky spider.

how dare you run like that!!!

---------- Post added at 01:17 PM ---------- Previous post was at 01:17 PM ----------

you may want to change you o2 sensor also.

test them first to avoid wasted money.

---------- Post added at 01:18 PM ---------- Previous post was at 01:17 PM ----------

8 MPG?! Quit bragging ...

and you, i dont know where to start with you and your tbi.

 

[Ceejkay]

incorrect.


how dare you run like that!!!

well i didnt know until i pulled everything apart

 

[SunlitComet]

how dare you did not know and pull everything apart!!!

 

[Orange]

So, what should I look into?

 

[blairian]

So, what should I look into?

EVERYTHING!!!

Just kidding, start with a full tune up and see what happens. Think you might be pleasantly surprised at the results.

 

[SunlitComet]

EVERYTHING!!!

woo, got a kinda sorta flashback of gary oldman in "the professional".

---------- Post added at 07:27 PM ---------- Previous post was at 07:25 PM ----------

before you start throwing parts at it how did you seafoam, as if i need to ask?

 

[blairian]

woo, got a kinda sorta flashback of gary oldman in "the professional".

---------- Post added at 07:27 PM ---------- Previous post was at 07:25 PM ----------

before you start throwing parts at it how did you seafoam, as if i need to ask?

Lol! I am also interested in said Seafoam application.

 

[Fishin757]

oh boy.. sun go easy on em

 

[SunlitComet]

I demand to know!!!

 

[Orange]

woo, got a kinda sorta flashback of gary oldman in "the professional".

---------- Post added at 07:27 PM ---------- Previous post was at 07:25 PM ----------

before you start throwing parts at it how did you seafoam, as if i need to ask?

Half a can in the vacuum line at brake booster, the other half in the gas tank

 

[SunlitComet]

Spray only and only in this way. http://www.seafoamsales.com/cleaning-the-induction-system-on-vortec-and-other-exotic-intake-engines/

 

[Big Buttons]

Do you mean this page Sun? http://www.seafoamsales.com/cleaning-the-induction-system-on-vortec-and-other-exotic-intake-engines/

 

[Orange]

Ok, I sprayed full can of Sea Foam spray through the intake, let the truck sit for 30 minutes... only a little bit of smoke. When I did the half can through the booster, I had massive amounts of smoke.

Drives the same, we'll see if the MPG increases during the next tank of gas.