Menu

1999 C1500 with horrible MPG

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 1999 C1500 with horrible MPG

  • Creator
    Topic
  • #581764
    Brandon ChandlerBrandon Chandler
    Participant

      I posted on here a while back about why my distributor(on my 1999 Chevy C1500 with 5.7) was getting corroded all the time. It ended up going away on its own, but now with that problem gone, I still have horrible fuel economy(I get maybe 5 miles to the gallon and that’s pushing it) and its driving me crazy that I cant figure out what is causing it. I know it doesn’t have to do with my ignition system because I’ve already replaced most of it. I know its not a head gasket because its not overheating, water isn’t getting in the oil, and vice verse, there is no combustion gases in my radiator, and I’ve done a compression test on each cylinder and they were all well within specs. I know its not the injectors as I’ve already replaced them. It doesn’t pull any codes and the only thing that gives me the slightest hint that it might be fuel related because I tested my fuel pressure and it dropped about 6 psi in under 5 minutes(From about 55 PSI) also I tried unplugging the Mass Airflow Sensor and let it run and it made no difference(as in the engine didnt start stuttering or anything) with it connected and disconnected . Its not running to rich or to lean, it runs fine, I cant smell fuel in my exhaust, no one is stealing my gas, its not my driving habits or tires because I’ve driven it the same way since I’ve owned it and the same sized tires have been on it since I’ve owned it. Might anyone have any ideas?

    Viewing 4 replies - 1 through 4 (of 4 total)
    • Author
      Replies
    • #581794
      college mancollege man
      Moderator

        Try cleaning the MAF sensor. Did the check engine light come on
        when you unplugged the MAF? With a scanner read what the front
        o2 is doing.

        #581800
        spelunkerdspelunkerd
        Participant

          Yeah, I would have a look at the output of the upstream O2 sensor(s). Downstream sensors have no effect on gas mileage but a lazy upstream sensor could certainly be a problem. Also recheck tire pressure and inspect the brakes to be sure you don’t have a seized caliper or drum.

          #581877
          EricTheCarGuy 1EricTheCarGuy
          Keymaster

            You might try the suggestions in this article for starters.

            http://ericthecarguy.com/faq/finding-and-fixing-the-causes-of-poor-mpg

            Keep us posted on your progress.

            #582021
            Brandon ChandlerBrandon Chandler
            Participant

              Ok, I checked my tire pressure, they are all at exactly 32 PSI, I have already tried cleaning the MAF, and the check engine light did not come one after I unplugged it. I did however go to autozone earlier to borrow one of their OBD2 scanners and i recorded the statistics(Heres the video of it)

            Viewing 4 replies - 1 through 4 (of 4 total)
            • You must be logged in to reply to this topic.
            Loading…
            slot gacor https://ibufoundation.or.id/totoup/ situs togel situs togel togel online bo togel situs togel situs togel toto macau agen toto situs togel situs toto bo togel situs togel situs togel resmi situs togel situs toto situs togel situs togel situs togel situs toto togel online situs toto rimbatoto rimbatoto rimbatoto situs toto bo toto situs toto situs togel situs toto slot gacor situs toto https://fpt.uho.ac.id/wp-content/themes/bet200/ situs toto slot gacor https://tp.fkip.ulm.ac.id/toto/ slot gacor slot gacor toto slot slot gacor bo togel situs toto situs togel situs togel slot demo slot gacor slot gacor situs togel bo togel https://fpt.uho.ac.id/wp-content/vendor/situs-toto-hotman/ situs togel/ bento4d situs toto situs togel situs toto monperatoto monperatoto monperatoto monperatoto toto slot monperatoto monperatoto situs toto slot gacor slot gacor SLOT GACOR slot gacor situs toto situs togel slot gacor situs toto toto slot slot gacor situs togel situs toto slot gacor situs toto situs toto monperatoto monperatoto monperatoto slot gacor slot gacor monperatoto SLOT GACOR situs toto situs togel