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91 MR2 NA 5sfe engine performance problem.

Home Forums Stay Dirty Lounge Service and Repair Questions Answered Here 91 MR2 NA 5sfe engine performance problem.

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  • #582192
    DavidDavid
    Participant

      I might be needing help to diagnose and repair my 91 Toyota MR2 engine performance problem. It’s somewhat intermittent(sometimes it runs normally) when I start the car sometimes it takes multiple attempts to get it started(not sure if I need to just prime the fuel pump I will try next time)but even after I get it idling it will struggle and if I try to give it gas the rpm’s will drop every time I hit the pedal and engine will want to cut off.

      If I do this for a while it eventually stabilizes and will even run normally but last time this happened I went and drove it took it on the freeway for like 5-10 minutes and did seem like there was some slight loss of power or lag.(unless i’m imagining it) When I exited and stopped at the first light the engine actually stalled.

      I also noticed the check engine light so I actually was able to pull codes (22)Water temp sensor and (24)Intake air temp sensor.

    Viewing 6 replies - 1 through 6 (of 6 total)
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    • #582194
      DavidDavid
      Participant

        I’ve had it in the garage most the winter but I want to try to test drive and see if I can make it happen again in the cold weather.

        I’m probably gonna go ahead and buy a multimeter first to see about those codes, maybe I can borrow a fuel pressure tester if needed to.

        #582196
        A toyotakarlIts me
        Moderator

          With those codes, find and fix the problem.. If your ECU is not getting coolant temp, it may not be going into closed loop and just running rich… The Air temp sensor tells the computer the mixture of fuel… Both of these are very important for a computer controlled engine to run properly…

          If the problem continues after repairs have been done; Two things come to mind based upon what you described.

          Weak fuel pump (check fuel pressure)

          Restricted exhaust (possibly clogged cat)… Eric has a video on this where he tests with a vacuum gauge..

          Good luck..

          -Karl

          #582243
          valdevalde
          Participant

            Not really related to your fault finding. Since you should concentrate on those codes.

            [quote=”rolloffdave” post=88726]…not sure if I need to just prime the fuel pump I will try next time…[/quote]

            Most of Toyotas made before 2000 (at least non obd2 ones) don’t turn fuel pump on before ECU will see engine turning over. So cycling the key doesn’t do any priming. You can make fuel pump to be on with key on using diagnostic connector.

            #582341
            EricTheCarGuy 1EricTheCarGuy
            Keymaster

              To me it seems like you need to gather more evidence. I would look into the diagnosis of the coolant temp sensor first as that can upset the entire fuel mixture. See if you can track down the service information that has the resistance values for the sensor and check yours to see if it’s in spec. The air temp sensor is not as critical and that code might have been set as a result of a bad coolant temp sensor. If you end up replacing the coolant temp sensor, reset the computer and see if the other code comes back. Additional information may be found here.

              http://www.ericthecarguy.com/faq/solving-automotive-performance-issues

              Keep us posted.

              #586401
              DavidDavid
              Participant

                I finally did the resistance checks the other day 9.7 K ohms(used two multimeters) about 15 degrees outside. That’s seems about right according to the ghetto graph in the repair manual. I’m not sure what a broke coolant temp sensor usually reads but looked close enough to the repair manual specs.

                I kind’ve feel like just buying a new sensor to see what happens but maybe i’ll hold off and go through the computer and wiring troubleshooting.

                If I do end up buying the part how do you feel about a CTS from Napa is it the same as OEM?

                #608188
                DavidDavid
                Participant

                  Its fixed! Almost forgot! I did all the testing when I could’ve just screwed in a new $15 part from auto zone. Its amazing the symptoms you get just from a faulty coolant temp sensor. Its like the car had the aids virus.

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