23 mpg to 13mpg

Reply Subscribe

Thread Tools

Search this Thread

Jun 9, 2010 | 08:16 PM

drago1217

Thread Starter

On The Tree

iTrader: (6)

Joined: Apr 2010

Posts: 166

Likes: 0

From: la porte TX

23 mpg to 13mpg

Can't seem to figure this one out. Usualy I get around 230 mpg but after washing my engine bay (trying to keep the car wash cleaner off all electrical stuff) now I get horrible gas milage. I just read the codes and it is the same codes it was throwing before. Catalyst, secondary air injection malfunction. It is due for an oil change it has been 3k miles since I bought it. Any ideas. I thought I might have messed up my maf but no code for it. Any help would be great

Jun 9, 2010 | 08:18 PM

drago1217

Thread Starter

On The Tree

iTrader: (6)

Joined: Apr 2010

Posts: 166

Likes: 0

From: la porte TX

Sorry I mean 230 miles per tank to 130 on a full tank to gas light coming on

Jun 9, 2010 | 08:20 PM

UnknownWarrior

Teching In

iTrader: (3)

Joined: Sep 2008

Posts: 18

Likes: 0

From: Arlington, Tejas!

You mean per tank not mpg lol try new plugs wires filter oil fuel filter etc and see how it goes

Jun 9, 2010 | 09:18 PM

Shackleford

TECH Addict

iTrader: (12)

Joined: Sep 2004

Posts: 2,693

Likes: 0

From: Houston, Texas

WOW! 230 mpg!!! That's awesome! Take that Chevy Volt! And Toyota Prius!

Jun 9, 2010 | 09:45 PM

whitehooptie

Staging Lane

iTrader: (2)

Joined: Oct 2002

Posts: 67

Likes: 0

From: Greenville Texas

O2's might be wet causing a lean condidtion. Maybe? My car does that sometimes when it rains, but it'll spit and sputter.

Jun 9, 2010 | 09:57 PM

Mr Powell

8 Second Club

iTrader: (1)

Joined: Nov 2001

Posts: 10,121

Likes: 0

From: Friendswood

Reading your title I was like GOOD GOD WHAT THE **** AM I DOING WRONG!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

Jun 9, 2010 | 10:12 PM

rickykline

Teching In

iTrader: (6)

Joined: Jan 2007

Posts: 43

Likes: 0

From: Houston,tx

was the engine hot when you washed it ? could have cracked the intake manifold causing a big vacuum leak.

Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?

Pouria Savadkouei

Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine

Verdad Gallardo

7 Most Reliable High-Performance Engines GM Has Ever Built

Verdad Gallardo

Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin

Verdad Gallardo

6 Common C5 Corvette Failures and What's Involved In Repairing Them

Pouria Savadkouei

Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph

Verdad Gallardo

Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked

Pouria Savadkouei

Top 10 Most Powerful Chevy Trucks Ever Made!

Hennessey's New Supercharged Silverado ZR2 Has 700 HP

Verdad Gallardo

Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes

Verdad Gallardo

Jun 9, 2010 | 10:48 PM

Donohue96M6Z28

TECH Junkie

iTrader: (64)

Joined: Sep 2004

Posts: 3,612

Likes: 0

From: San Antonio, TX

Join the club, I've been getting about 100miles per tank for about a yr. Been told I need to change the headers bc of an exhaust leak, needless to say, I ordered the headers on april 29, and after a few issues, still waiting on them

. WTF

Goodluck

Jun 9, 2010 | 11:24 PM

#10

whitehooptie

Staging Lane

iTrader: (2)

Joined: Oct 2002

Posts: 67

Likes: 0

From: Greenville Texas

Man after seeing some of your guys mileage, I guess I feel good. I freak out if I get any less than 250 to a tank. And that's an LT1 car.

Jun 10, 2010 | 12:03 AM

#11

BizZzatch350

Moderator

iTrader: (33)

Joined: Dec 2001

Posts: 9,794

Likes: 15

From: T E X A S

Quote:

Originally Posted by whitehooptie

Man after seeing some of your guys mileage, I guess I feel good. I freak out if I get any less than 250 to a tank. And that's an LT1 car.

LT1 gas gauges were guesstimate gauges. Freeway/city mix I would fill up at 1/4 tank mark, mine would get about 200-215 miles off 12.5 gallons. So imagine off 15 gallons I would be some where near 250, that was with a 3200 Vigi torque converter. Good times, I miss daily driving it.

Jun 10, 2010 | 12:21 AM

#12

jbridwelltransam

TECH Enthusiast

iTrader: (12)

Joined: Jul 2009

Posts: 559

Likes: 4

From: South Carolina

yep my lt1 gas gauge goes up to about 1/4 past full. Ive heard that once it gets down to about full then you are at a half tank, at half tank mark you are a lil more than a quarter, and when it is on empty you better be at a gas pump or you'll be walking.

Jun 10, 2010 | 12:27 AM

#13

Jake_the_Snake

On The Tree

iTrader: (5)

Joined: Jul 2009

Posts: 171

Likes: 0

From: Clarksville, TN

haha my lt1s the same way. i usually fill up around 1/4 mark at 220-230 miles. usually fill up around 12 gallons or so

Jun 10, 2010 | 01:48 AM

#14

whitehooptie

Staging Lane

iTrader: (2)

Joined: Oct 2002

Posts: 67

Likes: 0

From: Greenville Texas

I fill up around 14 gallons if I run it dry. I'm at around 275 on the odometer. 250 is around 12 gallons.

Jun 10, 2010 | 05:19 AM

#15

rabiddog

On The Tree

iTrader: (1)

Joined: Aug 2009

Posts: 142

Likes: 0

From: Midland TX

hit 26 mpg on my way to Houston a couple weeks ago cruising from 90 to 110mph. Only got 18 on the way back cruising @ 70-75mph. That will change once I get a new rear end with 4.10's though.

Jun 10, 2010 | 06:20 AM

#16

drago1217

Thread Starter

On The Tree

iTrader: (6)

Joined: Apr 2010

Posts: 166

Likes: 0

From: la porte TX

the motor wasn't really hot when I washed it and I kept it off the block and hand washed it later when it was cool. I'm stumped. I'll give it a tune up this weekend and see if it helps.

Jun 10, 2010 | 06:31 AM

#17

cambirdracing

TECH Resident

iTrader: (4)

Joined: Jun 2009

Posts: 865

Likes: 2

From: League City Texas

Thank God I have a 3.4 v-6. I get about 26 on the highway, usually around 350 miles to the tank. That is about 3 days worth of fuel. All that with 270,800 miles on the clock.