Menu

Engine parameters for a 1990 Jeep Wrangler

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here Engine parameters for a 1990 Jeep Wrangler

  • Creator
    Topic
  • #853513
    gabe collinsgabe collins
    Participant

      I got a snap on mt2500 scanner but I don’t know he engine parameters like the long term and short term fuel trim, all that stuff since the renix system on these old jeeps ranging from 1987-1990 can’t creat and store dtcs

    Viewing 5 replies - 1 through 5 (of 5 total)
    • Author
      Replies
    • #853515
      gabe collinsgabe collins
      Participant

        It’s the 2.5 i4 single port injected

        #853559
        Gareth RandallGareth Randall
        Participant

          I would start by getting hold of the Chrysler diagnostic manual (NOT the factory service manual) for the 1990 2.5L Wrangler. There are a few on eBay right now, like this one: 1990 Jeep Wrangler Powertrain Diagnostic Manual

          The diagnostic manuals are separate items to the FSM, and go into detail about using DRB scan tools to diagnose problems. They are full of information that isn’t included in the FSMs.

          I would warn that the Snap-on scanner may not be the right tool for the job and you may need to use a period Chrysler DRB2 scan tool along with the Jeep/Eagle adapter to get any meaningful data out of the system. I picked up a complete DRB2 kit including the Jeep/Eagle adapter a few years ago on eBay for about $300.

          #853610
          gabe collinsgabe collins
          Participant

            I’ll look into the diagnostic Manuel. And I’d like to have a fsm on hand as well since that would be a lot better than the Haynes Manuel

            #853637
            Gareth RandallGareth Randall
            Participant

              For sure get the FSM. It’s just a bit annoying with Chrysler that the FSM misses out a lot of diagnostic procedures, instead directing you to the relevant diagnostic manual. You really need the FSM *and* the full set of diagnostic manuals for any given vehicle from that era.

              EDIT – just for my own interest I did some Googling, and came up with this info about the Renix fuel injection system, which you may find useful: Jeep Renix fuel injection

              #853644
              gabe collinsgabe collins
              Participant

                That makes a whole lot more sense now. I’ll have to clean up the 2 grounds and see what happens. The jeep runs but it’s stubborn at given moments

              Viewing 5 replies - 1 through 5 (of 5 total)
              • You must be logged in to reply to this topic.
              Loading…