Imp558 Posted October 10, 2009 Author Report Share Posted October 10, 2009 I guess in theory my ghetto scrubber may not have done anything. It could have just been that it didn't smoke a bunch? I felt better about it because I live in a very small suburban borough where I'm the only gearhead and they don't approve of my NUDIST ACTIVITIES already. possible..... Only INSIDE the house. I was more referring to things like: Car collection, air tools, Kayak in the yard, Mini BMX track, ect..... Quote Link to comment Share on other sites More sharing options...
Imp558 Posted October 12, 2009 Author Report Share Posted October 12, 2009 New MAP, new front O2, cleaned MAF, new CTS, new air filter, tested IAT - ok, cleaned air box, throttle body, and air intake tube. Ran seafoam, pulled all 4 wheels and all are rolling free, all tires at 35PSI. Checked codes - none, plugs and wires are 6mo old and the mileage was the same before and after I did them. Did my economy again and it's still 15 MPG!!! Now I'm thinking about a plugged converter, but it doesn't stink or anything. I have been running Citgo 89 gas and kept it the same because it's a block from home. Tomorrow I guess I'll get gas at Sheetz since they are from another refinery and see if it's possibly the fuel, I guess? If that doesn't work I'm taking it to my pastor for an exorcism or something. I'll also clean and check my plugs, DAMN! I should have done that while the O2 sensor was out of the way! Quote Link to comment Share on other sites More sharing options...
88red4cyl Posted October 12, 2009 Report Share Posted October 12, 2009 The 3800 in my LTZ got about 15 around town as well... It used to get higher, and then it just mysteriously dropped off... I did the plugs and wires and checked out all the sensors, and I never did find anything wrong with it, and it ran great... The cat was pretty much my last resort, but I sold it before I ever got around to replacing it... Quote Link to comment Share on other sites More sharing options...
Night Fury Posted October 12, 2009 Report Share Posted October 12, 2009 Evap problems? Quote Link to comment Share on other sites More sharing options...
xtremerevolution Posted October 12, 2009 Report Share Posted October 12, 2009 Evap problems? Not sure if EVAP problems would cause bad fuel economy. If anything, you'd be getting an SES code from an evap leak. Quote Link to comment Share on other sites More sharing options...
AL Posted October 12, 2009 Report Share Posted October 12, 2009 Is your fuel enriched with ethanol bull crap Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted October 12, 2009 Report Share Posted October 12, 2009 Is your fuel enriched with ethanol bull crap that kills fuel economy, but not like this... Quote Link to comment Share on other sites More sharing options...
Imp558 Posted October 12, 2009 Author Report Share Posted October 12, 2009 I'll change fuels, tune the PCM, test the coil primaries with a meter. and clean the plugs (damn cyl 4 pointed right at that O2). I'm also looking at some cheezy software to watch real time data, maybe I can see something there because my scantool doesn't do that. I could have bought a cheap laptop with what I've spent on poor fuel economy. I'd love to hollow out the converter "um, I mean..replace it" and see if the muffler might be full of converter shrapnel. I wish my pressure gauge set would do a leakdown test. Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted October 12, 2009 Report Share Posted October 12, 2009 what year? Quote Link to comment Share on other sites More sharing options...
tornado_735 Posted October 12, 2009 Report Share Posted October 12, 2009 I'm curious about this. There is a guy I know who boasts 32mpg/hwy out of his 3800, yet, I have never broken 30mpg/hwy in my 3100. I got 32mpg once out of my '91 CS 3.1, but that's the best I've ever done. Quote Link to comment Share on other sites More sharing options...
Imp558 Posted October 12, 2009 Author Report Share Posted October 12, 2009 1996, it's a S-II N/A. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted October 12, 2009 Report Share Posted October 12, 2009 I didn't have a problem with cyl 4 spark plug, #2 was more of a bitch Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted October 12, 2009 Report Share Posted October 12, 2009 I'm curious about this. There is a guy I know who boasts 32mpg/hwy out of his 3800, yet, I have never broken 30mpg/hwy in my 3100. I got 32mpg once out of my '91 CS 3.1, but that's the best I've ever done. i RARELY get less than 30MPG with the MC... Quote Link to comment Share on other sites More sharing options...
Night Fury Posted October 12, 2009 Report Share Posted October 12, 2009 I got lower 30's easy with my 3100 Ciera, even 36 one time. Quote Link to comment Share on other sites More sharing options...
Imp558 Posted October 12, 2009 Author Report Share Posted October 12, 2009 I didn't have a problem with cyl 4 spark plug, #2 was more of a bitch It was spring but I think it was #4 that points right at the O2 sensor. 2 or 4 it sucked. Quote Link to comment Share on other sites More sharing options...
tornado_735 Posted October 12, 2009 Report Share Posted October 12, 2009 Well shit, I must have something going on, or I have a heavy foot. Quote Link to comment Share on other sites More sharing options...
slick Posted October 12, 2009 Report Share Posted October 12, 2009 Evap problems? Not sure if EVAP problems would cause bad fuel economy. If anything, you'd be getting an SES code from an evap leak. EVAP problems can cause HUMONGOUS fuel economy drops. Quote Link to comment Share on other sites More sharing options...
tornado_735 Posted October 12, 2009 Report Share Posted October 12, 2009 Evap problems? Not sure if EVAP problems would cause bad fuel economy. If anything, you'd be getting an SES code from an evap leak. EVAP problems can cause HUMONGOUS fuel economy drops. Would that include a bad gas cap? Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted October 12, 2009 Report Share Posted October 12, 2009 Evap problems? Not sure if EVAP problems would cause bad fuel economy. If anything, you'd be getting an SES code from an evap leak. EVAP problems can cause HUMONGOUS fuel economy drops. Would that include a bad gas cap? your fuel tank wouldn't build up the pressure that help the CC purge, so yeah... Quote Link to comment Share on other sites More sharing options...
tornado_735 Posted October 12, 2009 Report Share Posted October 12, 2009 Evap problems? Not sure if EVAP problems would cause bad fuel economy. If anything, you'd be getting an SES code from an evap leak. EVAP problems can cause HUMONGOUS fuel economy drops. Would that include a bad gas cap? your fuel tank wouldn't build up the pressure that help the CC purge, so yeah... CC? And I'm off to find (a new gas cap!) Quote Link to comment Share on other sites More sharing options...
RobertISaar Posted October 12, 2009 Report Share Posted October 12, 2009 Carbon Cannister... Quote Link to comment Share on other sites More sharing options...
Night Fury Posted October 12, 2009 Report Share Posted October 12, 2009 Evap problems? Not sure if EVAP problems would cause bad fuel economy. If anything, you'd be getting an SES code from an evap leak. EVAP problems can cause HUMONGOUS fuel economy drops. I win! Quote Link to comment Share on other sites More sharing options...
old442man Posted October 12, 2009 Report Share Posted October 12, 2009 Run a tank of 91 with no ethanol. Just try it. Also have you checked the fuel pressure regulator? Quote Link to comment Share on other sites More sharing options...
Imp558 Posted October 19, 2009 Author Report Share Posted October 19, 2009 I checked the fuel pressure around June and it was good. I'm up to 18 MPG now so something is working. I believe the fuel from United Refining contains no Ethenol but I may be wrong. Where I'm at It's Citgo and Kwik-Fill gasoline. Sheetz may contain up to 10%, and I just got 16 MPG on their gas. Quote Link to comment Share on other sites More sharing options...
Night Fury Posted October 19, 2009 Report Share Posted October 19, 2009 I only managed to get 25.4 on my last trip, avg speed prolly 65-70 mph... I'm pretty upset about that! Quote Link to comment Share on other sites More sharing options...
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