Desperate need of help please
 

I have a 03 trailblazer 4.2. I have recently tuned it up with all new filters, cleaned the tb and disconnected the batt. My problem is i am burning the mess out of gas. I noticed on my scanner that the calc load is 100% all the time unless you completely let off the gas then it goes to 30-35%. I noticed also that the upstream o2 sensor readings are so fast i hardly have time to read them. It has 145,000 miles on it. I am lost with this and do not know what to check. If anyone can please help me i would be greatly appreciated.

Replace the upstream o2 sensors

I Know First Hand Because Have Have Three People I Know With TrailBlazers The MPG On Gas Sucks As It Is You Could Try Cold Air Intake To Improve Mpg As long As You Don't Have A Heavy Foot And Possible A Performance Chip Its Gunna Run You A Lil Money My Cold Air For My 1990 Chevy K1500 Ran Me $220 and The Performance Chip was $70 not sure exactly How Much MPG Is Increased With Cold Air Intake But The Chip I Got Can Improve Up To 8mpg not saying it will that much ofcourse

I will replace it and let you know what happens. Thanks for the suggestion. I have had a post on trailvoy about this and no one has put any input on it at all. Thanks alot

I have heard good and bad about a cold air intake. Some have said its a gimmik and it does nothing. I will see what one will cost for it and see about a chip also. Thanks

Yes Sir But i Can Tell you The One On My Truck Is Pretty good And Its Called ProFab By Spectre Same As K&N But Half The Price But good Luck On Your Problem Have Question Or Need Help Let Me Know

Are you familer with what the short term fuel trim and long term should be on mine? Also what about the fuel trim? My fuel trim is at 21 ideling and 4-6 when you give it a lil gas. My stft is pos 1- neg9 % - 117-127 and my ltft is neg 4% - 123 ok when i drive for 5 min or so and stop and put it in park the stft is at neg 20% - 103 and the long is neg 5% - 121 . I do not really know much about that yet. Do you know if all this is ok? It also is in closed loop.. Thanks for helping