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1993 Mazda 626 4cyl 5speed inconsistently dying after 20-45m

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  • #435746
    JnLRacingJnLRacing
    Participant

      I have a white 1993 626 with just over 60,000 original miles on it. It has a problem acting like its not getting fuel or spark. No matter the driving condition. Highway, in town doesnt matter. Its not over heating. And after just 5-6 mins it will start right back up and go another 30 mins. The obd says miss fire in the coil. Its been replaced twice. The exhaust recently broke and as soon as it did, it had the same issue and died. 5 mins later it was running. (Louder then a MFer) but running. It also has a small issue when stopped the idle with drop and act like its gonna

    Viewing 14 replies - 1 through 14 (of 14 total)
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    • #435747
      college mancollege man
      Moderator

        You will need to start with basics. battery terminals clean
        and tight. fuel pressure. You do have a code for a misfire.
        try doing a power balance test. for the low idle try tapping
        on your IAC with the handle of a screw driver to see if the
        idle changes. if it does replace the IAC does the car have a
        fuel filter? might need changing

        http://www.youtube.com/watch?v=bAOmUjAj … plpp_video

        #435748
        JnLRacingJnLRacing
        Participant

          Batterys fine. No code. I changed the fuel filter right after buying. but after driving below 1/4 tank it started started again. I plan on dropping the tank and cleaning and replacing pump, filter Ect…

          #435749
          EricTheCarGuy 1EricTheCarGuy
          Keymaster

            You asked about vacuum leaks which is a real possibility, here’s a link to a video I did on the topic.
            http://www.youtube.com/watch?v=9CPqbaSgcok+

            #435750
            JnLRacingJnLRacing
            Participant

              Ive got an update. I drove the car yesterday. I drove it down to 1/4 of a tank. After about 45 mins it died. i let it sit for about 10mins while i looked at another car. I got back in and drove it 10mins and it died again. This leads me to believe theres some in fuel delivery. I had plans on dropping the tank any way. Do you think there’s something in the tank? Or a fault part?

              Thanks for all the help.

              #435751
              johnzcarzjohnzcarz
              Participant

                You need to find what’s missing when the car stops running. I wouldn’t go through all the trouble of dropping a fuel tank unless theres a good reason to do it.
                Check for spark and fuel first. A quick way to check for lack of fuel is just spray some starting fluid in the intake and see if it starts. For spark, just pull a plug and see if there’s spark during cranking.

                #435752
                JnLRacingJnLRacing
                Participant

                  I know theres spark. It acts like a lack of fuel and or pressure. At least the car isnt rusty.

                  #435753
                  EricTheCarGuy 1EricTheCarGuy
                  Keymaster

                    If you suspect a problem with fuel pressure hook up a fuel pressure gauge and tape it to the windshield as you drive around and monitor the pressure when the condition occurs, if it drops off when it stalls then you know you have a problem with fuel delivery. Keep in mind it could also be a spark issue as electronic components often fail when they get hot, ignition coils are no exception.

                    #435754
                    JnLRacingJnLRacing
                    Participant

                      I have ANOTHER update. Filled the car back up to almost full. Drove it ten mins. Died. Took me 45 mins to drive 3 miles. I let it sit for ten mins betweens deaths. Leads me to believe fuel cause it started RIGHT after i got down to 1/4 tank. So my next move is going to be changing the in-line filter and dropping the tank and cleaning it out.
                      -Thanks

                      #496753
                      djdevon3djdevon3
                      Participant

                        I know this is an old topic but I’ve been unable to log into the forums for the longest time. JnLRacing, the 626/MX-6/Probe’s biggest issue is the distributor failing. Symptoms will show up as the car dying, then letting it sit to cool will be able to start again. This is because the cam sensor inside the distributor gets heat soaked and stops reporting any value. Next time you have this no-start condition check for spark. It’s as simple as that. If you have spark then it’s probably a fuel pump or fuel pump regulator issue which aren’t as common as the distributor failing but do happen as with any vehicle.

                        #498105
                        djdevon3djdevon3
                        Participant

                          I know this is an old topic but I’ve been unable to log into the forums for the longest time. JnLRacing, the 626/MX-6/Probe’s biggest issue is the distributor failing. Symptoms will show up as the car dying, then letting it sit to cool will be able to start again. This is because the cam sensor inside the distributor gets heat soaked and stops reporting any value. Next time you have this no-start condition check for spark. It’s as simple as that. If you have spark then it’s probably a fuel pump or fuel pump regulator issue which aren’t as common as the distributor failing but do happen as with any vehicle.

                          #496804
                          college mancollege man
                          Moderator

                            next time it stalls.spray starter fluid down the intake
                            and see if it runs.If it does then I would suspect fuel issue.
                            as suggested put a fuel pressure gauge on it to confirm.

                            #498166
                            college mancollege man
                            Moderator

                              next time it stalls.spray starter fluid down the intake
                              and see if it runs.If it does then I would suspect fuel issue.
                              as suggested put a fuel pressure gauge on it to confirm.

                              #498256
                              EricTheCarGuy 1EricTheCarGuy
                              Keymaster

                                If you suspect a fuel issue check the fuel pressure. In fact I’ve driven around with a fuel pressure gauge taped to the windshield for just that very reason. This way you will be able to see if a loss of fuel pressure is causing your stalling problem.

                                #499704
                                EricTheCarGuy 1EricTheCarGuy
                                Keymaster

                                  If you suspect a fuel issue check the fuel pressure. In fact I’ve driven around with a fuel pressure gauge taped to the windshield for just that very reason. This way you will be able to see if a loss of fuel pressure is causing your stalling problem.

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