Mpg went to total crap after k&n

[destroyer1362]

where the plastic tube meets the top of the tb.

 

[destroyer1362]

After going 167mi theres no more carbon dripping out of my exhaust. Mileage is 12mpg now but I have been pretty ******* it over the last 167 miles 50-100+ race w/ my buddy's cobalt (na modified) and I was sitting in a parking lot for about an hour running, and on top of all that my driving has been 90% city. I'm figuring if I'm easy on it now the mileage should be back to what it is supposed to be.

 

[destroyer1362]

Still have the same problem.. Anyone think replacing the fuel filter would be worth a shot? It was done about 7k ago but I had just seafoamed prior to the filter replacement. Also the tank was dropped about 3 times after that for a few dud fuel pump replacements. Maybe things got stirred up and prematurely clogged the filter. A hummer (h1) gets better mileage than me

 

[07Burb]

Never hurts. It's cheap and easy to do so "why not?" I say

 

[SunlitComet]

I would recommend getting that thing on a pc-based(if possible, screen can display more simultaneous data) scanner and study all the PID's. Something will show in there being off.

 

[07Burb]

That's gotta pop up something as being slightly off! Good suggestion sunlit!

 

[destroyer1362]

I would recommend getting that thing on a pc-based scanner and study all the PID's.

Where can I go to do that? would any good shop have it?
I have scanner software but I don't have a cable..

 

[SunlitComet]

try scantool.net and see if your software is compatible with an interface from them. I recommend though you get scanXLPro with the gm add-on. Has a lot of pids. Most shops have scanners pc or hanheld just not sure how smart they are to interpret data. People that is.