|
 |
|
 |
 |
|
2003 GMC Sierra
- BAD fuel mileage
started by ZRT600
|
|
|
|
April 12th 2009 at 4:35 PM
[ Modified April 12th 2009 at 4:50 PM
]
|
|
| |
|
ZRT600
Senior Member
|
2914 Posts 
Group: Members
Member Since: November 19th 2002
Location: Sudbury, Ontario, Canada
Current Sled: 09 X-Fire 800 SnoPro
2008-2009 Miles: 610
|
|
|
|
| |
206,000km on it, runs great, had a cat efficiency low code in about Oct, re-set it and it never came back on, at the same time the downstream O2 sensor voltage low code was up. I haven't changed anything, figured at least 1 code would come back and that would point me to the problem. I'm getting about 13mpg, 18km/100km. I did a trip up to camp, got 13mpg cruising at about 60mph. The following week in the city I was getting 14mpg, and I have a heavy foot. It has the 4.8 engine, with a K&N cold air intake, which has been cleaned. Any ideas?
EDIT: No check engine light, but code P0496 comes on, Evaporative Emission System High Purge Flow, what could this be?
|
|
 |
|
|
|
|
|
| |
Site Supporter
Group: Site Supporters
|
|
| |
|
|
|
|
|
|
April 12th 2009 at 5:03 PM
|
|
| |
|
wot800
The PTD
|
54 Posts 
Group: Members
Member Since: December 18th 2007
Location: Columbus, Wisconsin, USA
Current Sled: 2006 F7 SP,1996 Indy 440
2008-2009 Miles: 900
|
|
|
|
| |
Could it maybe be that your cat is plugged? Does it have a loss of power at all?
Thats not that bad of fuel mileage, I have a 08 1500 with a 5.3 with the multi-bs that is suppose to shutdown to get better, but the best I get on the highway is 17.5 and 14 in the city, and its suppose to be 17 city and 20 highway.
2001 XC 800 SP
MBRP race can
1.375" track
2" riser
2006 F7 Sno Pro EFI
Bikeman clutch kit
Handguards
144 studs
1997 Indy 440
Studs
Electric start
Reverse
|
|
|
|
|
|
April 12th 2009 at 5:11 PM
[ Modified April 12th 2009 at 5:12 PM
]
|
|
| |
|
|
ZRT600
Senior Member
|
2914 Posts
Group: Members
Member Since: November 19th 2002
Location: Sudbury, Ontario, Canada
Current Sled: 09 X-Fire 800 SnoPro
2008-2009 Miles: 610
|
|
|
|
| |
It doens't seem like it's plugged, and another thing, it seems like it wont set the evap system monitor, before this last code the light was still flashing. How can I check the cats without an emissions tester? I used to get 700km per tank easy, now I get about 450.
|
|
|
|
|
|
April 12th 2009 at 5:39 PM
|
|
| |
|
fusionshuk06
Average Member
|
570 Posts 
Group: Members
Member Since: January 17th 2007
Location: Elba, New York, USA
Current Sled: 600 RR
2008-2009 Miles: ???
|
|
|
|
| |
man I wish my milage was that good I get about 10 on a good day with my silverado 2500
but if you where getting it before I would figure that out
|
|
|
|
|
|
April 12th 2009 at 6:07 PM
|
|
| |
|
|
wot800
The PTD
|
54 Posts
Group: Members
Member Since: December 18th 2007
Location: Columbus, Wisconsin, USA
Current Sled: 2006 F7 SP,1996 Indy 440
2008-2009 Miles: 900
|
|
|
|
| |
the only way you can check them is to pull them off if you dont have a tester. But I know your milage will drop though, I had a bronco and I took a condensor off after the cats and lost 50% of my mileage. I know alot of people will take the cats off and knock the guts out of them and put em back on cause their so expense to replace. Thats kind of a hard one to diagnose.
2001 XC 800 SP
MBRP race can
1.375" track
2" riser
2006 F7 Sno Pro EFI
Bikeman clutch kit
Handguards
144 studs
1997 Indy 440
Studs
Electric start
Reverse
|
|
|
|
|
|
April 12th 2009 at 6:49 PM
|
|
| |
|
RMK-KING
The Fabricator Moderator
|
9123 Posts 
Group: Moderators
Member Since: October 3rd 2002
Location: Center and Roseglen, ND, USA
Current Sled: 09 RMK 700 & 06 IQr 600
2008-2009 Miles: 550
|
|
|
|
| |
You might just need to replace your O2 sensor as its giving your engine a bad reading,think they say to replace them every 70,000miles or so.
Current Line Up
-09 RMK Assault
-06 IQ R 600HO
-01 ProX 600
-95 XCR 600
Days get shorter,snow gets deeper,life gets better.
|
|
|
|
|
|
April 12th 2009 at 9:22 PM
|
|
| |
|
arcticcatmatt
Spleen Splitter
arcticcatmatt leaving after work for 3 days of shotgun season back home!
Updated Yesterday at 12:16 PM
|
14006 Posts
Group: Moderators
Member Since: November 25th 2001
Location: Berkshire, NY, USA
Current Sled: 96/97 ZRT 600
2008-2009 Miles: 450
|
|
|
|
| |
Well focusing on the current code you have I looked it up and found this to be a good read
http://www.chevyavalanchefanclub.com/caf...ic=88017.0
I can't read all the pages there because my computer is being a bitch. Have you searched fullsizechevy.com ?
Also you said you have a heavy foot? That doesn't help figuring it out. I have close to the same truck as you and get 15.5 almost every tank.. and 19 mpg on the expressway
|
|
|
|
|
|
April 12th 2009 at 10:08 PM
[ Modified April 12th 2009 at 10:11 PM
]
|
|
| |
|
|
ZRT600
Senior Member
|
2914 Posts
Group: Members
Member Since: November 19th 2002
Location: Sudbury, Ontario, Canada
Current Sled: 09 X-Fire 800 SnoPro
2008-2009 Miles: 610
|
|
|
|
| |
Quote originally posted by arcticcatmatt
Well focusing on the current code you have I looked it up and found this to be a good read
http://www.chevyavalanchefanclub.com/caf...ic=88017.0
I can't read all the pages there because my computer is being a bitch. Have you searched fullsizechevy.com ?
Also you said you have a heavy foot? That doesn't help figuring it out. I have close to the same truck as you and get 15.5 almost every tank.. and 19 mpg on the expressway
I didn't find that one, thanks, and fulsizedchevy says about the same. I think it could be the gas cap for that one, I made sure it was on right, I'll see if it comes back. I dont mine 14mpg in the city as I am hard on it, it's the 13 on the highway that drives me nuts. Also RMK I think you might be right, but there $190 each and I dont want to change them unless I know forsure. I think there still the originals to, and the upstreams are even more money.
|
|
|
|
|
|
April 13th 2009 at 1:29 PM
[ Modified April 13th 2009 at 1:31 PM
]
|
|
| |
|
buckfever
W.T.F.N Racing
|
2104 Posts
Group: Members
Member Since: December 9th 2003
Location: Buchanan, Michigan, USA
Current Sled: 96 Ski Doo Formula 3 600
2008-2009 Miles: 0
|
|
|
|
| |
Well this might sound dumb. But When I started to have problems with the cats on my truck "2000 chevy 2500 6.0" The exhaust smelt almost like rotton eggs or had a sulfur smell to it. Also I could hear a weird detonation sound in my cats.
Also I have heard of bad 02 sensors causing that same problem that you have.
I have had to change my gas cap on my truck before because it threw a code. I dont remember what the code was. But I was told you have to make sure the gas cap seals tight because its a pressurized fuel system.
96 Ski Doo Formula 3 600 with dyno port tips.
96 Arctic Cat ZRT 600 with stinger tips.
02 Yamaha Raptor 660R
00 Chevy Silverado 2500
WHY THE F*CK NOT RACING
|
|
|
|
|
|
April 17th 2009 at 12:06 PM
|
|
| |
|
|
ZRT600
Senior Member
|
2914 Posts
Group: Members
Member Since: November 19th 2002
Location: Sudbury, Ontario, Canada
Current Sled: 09 X-Fire 800 SnoPro
2008-2009 Miles: 610
|
|
|
|
| |
Ya, it's a pressurized system, I dont really like that idea. I've been playing with it a little, and it seems ok now, theres no funny smell, I ran a couple tanks of injector cleaner through it, and cleaned up the O2 sensors, seems ok now, being very hard on it I got 380km on 1/2 tank. Should be a lot better on the highway to.
|
|
|
|
|
|
April 17th 2009 at 1:15 PM
|
|
| |
|
zxkid
not really a kid anymore :(
zxkid doesn't know what irritates him more..Home Depot, or their website!
Updated Yesterday at 10:23 AM
|
491 Posts 
Group: Members
Member Since: February 29th 2008
Location: N.Adams, MA, USA
Current Sled: 2004 F7 SnoPro EFI
2008-2009 Miles: 1312
|
|
|
|
| |
try removing the air tube and cleaning the throttle body, check for a vacuum leak. those evap codes are usually a small vac leak somewhere, or a bad gas cap. When was the last time the fuel filter was changed. For a full-size V8 with 200k 13mpg doesn't sound that bad. If it hasn't been tuned in a while, you'd be amazed at what a fuel filter, pcv valve and a set of plugs will do.
"To be old and wise, you must first be young and stupid"
|
|
|
|
|
|
April 19th 2009 at 12:33 PM
|
|
| |
|
|
ZRT600
Senior Member
|
2914 Posts
Group: Members
Member Since: November 19th 2002
Location: Sudbury, Ontario, Canada
Current Sled: 09 X-Fire 800 SnoPro
2008-2009 Miles: 610
|
|
|
|
| |
Quote originally posted by zxkid
try removing the air tube and cleaning the throttle body, check for a vacuum leak. those evap codes are usually a small vac leak somewhere, or a bad gas cap. When was the last time the fuel filter was changed. For a full-size V8 with 200k 13mpg doesn't sound that bad. If it hasn't been tuned in a while, you'd be amazed at what a fuel filter, pcv valve and a set of plugs will do.
I did the throttle body when I cleaned the air filter about 2 months ago, I guess it might be time to start testing for vacuum leaks like you said. Fuel filter was done about a year ago, I have one in the garage, but there such a pain to get off sometimes. It seems like it's doing much better now tho, hopefully it stays that way.
|
|
|
|
|
1 user(s) are reading this topic (0 Members and
1 Guests)
|
 |
|
