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    #1

    Fresh trouble on the horizon

    First of all hello everybody! Newbie here.

    My baby is a 1995 Protege with Z5 engine, no A/C, just P/S and power locks/windows (just in case that helps in solving the problem)... The problem I noticed is that the engine somehow surges slightly when cruising around 2000-2500 RPMs in all gears. It's not that harsh as it is annoying when you hit the rhythm and the car just vibrates. The idle is fine (around 730-750), the oxygen sensor is fine (the emission test has shown good results - 0.1 %, 0.1 %, 1.0 at idle), the car revs up normally, it even accelerates evenly, like the day I have bought it. It's just one particular moment when you can notice surging.

    Here's what I have already done:

    - new air intake hose
    - fuel filter replacement
    - main fuse replacement
    - PCV valve inspection and hose replacement (a little tear)
    - distributor cap disassembly, and wiping the moisture since it was greasy all over on the underside (2nd & 4th cylinder - L-R)
    - spark hotwires replacement, since 2 and 4 oxidized

    What else can I do? I cannot measure the fuel pressure because I don't have a gauge and the fuel filter replacement was a pain in the ass (sorry for the language). Should I try with new spark plugs? Should I take my baby for a diagnosis? Are the injectors the case? I must say that there's no sign of stalling or any lack of combustion. It's like a slight tremolo if considering music. It's not much but it's noticeable and I want to solve the problem. I even don't know the nature of it ... is it fuel/air system, electricity, clutch,
    gearbox? Is it timing/messed distributor?
    Garage: Mazda Protege 1995, Z5 engine, MTX, P/S, no A/C, no ABS.

    PM me if you need: comprehensive Autodata information; Mazda's 2nd generation workshop manual; Mazda's Z5 overhaul workshop manual.
    Tags: None
    #2
    are you absolutely sure it's motor related ? could be several differnt things and possibly speed related rather than rpm related. try getting it to the vibration point and ( you didnt mention whether atx or MT) shift to neutral . if the vibration persists before speed drops it could be cv joints, a worn tire , ballancing issue ect


    side note ... cruising rpm ... doesnt that model/motor have egr issues ? i know that affects idle mostly but you arent that far off-idle

    i would consider surging to be an increase and decrease in rpm


    Comment

      #3
      No no, it is surely engine/electricity related thing. I forgot to mention that I have already changed the fuel, rechecked tire pressure numerous times. It's manual transmission.

      The car does not run smoothly at that point, if you know what I mean. It means we have a couple of hops and the only thing to avoid this is to accelerate a bit or slow down. Either is working. It is the far most noticeable when accelerating very gently.
      Garage: Mazda Protege 1995, Z5 engine, MTX, P/S, no A/C, no ABS.

      PM me if you need: comprehensive Autodata information; Mazda's 2nd generation workshop manual; Mazda's Z5 overhaul workshop manual.

      Comment

        #4
        try replacing the spark plugs, use NGK's
        Escort GTR -- 11.87 @ 117.6 mph -- 320 HP / 325 Ft. Lbs. @ 23 PSI
        ... The first FWD BG with a Toyota E153 transmission conversion in the USA!
        Looking for BP x Toyota E153 adapter plates? PM me or contact me on Facebook: Riel Performance Parts

        Comment

          #5
          I do use NGK's and they're not even a year old. I have also veryfied them and they are fine.
          Garage: Mazda Protege 1995, Z5 engine, MTX, P/S, no A/C, no ABS.

          PM me if you need: comprehensive Autodata information; Mazda's 2nd generation workshop manual; Mazda's Z5 overhaul workshop manual.

          Comment

            #6
            check out this thread!

            http://www.wihandyman.com/forum/showthread.php?t=23106
            sigpic

            Comment

              #7
              I have scheduled an appointment at the Austrian Mazda repair station, which is the most advanced Mazda workshop there is in Middle Europe, for a diagnosis. We will see what tomorrow brings. Wish me luck!
              Garage: Mazda Protege 1995, Z5 engine, MTX, P/S, no A/C, no ABS.

              PM me if you need: comprehensive Autodata information; Mazda's 2nd generation workshop manual; Mazda's Z5 overhaul workshop manual.

              Comment

                #8
                my engine had a mild fluctuation point, try rev matching it to that point in neutral & see wat it does
                ---Has ClubProtege helped you in someway? show your support by Contributing--- Click Here---

                1992- project FE3..... 313 WHP @ 9.3psi



                I pet my dash when I get into the car..."good car"
                he actually has a mazda tree, parts grow on it

                Comment

                  #9
                  Be sure the let them know what suggestions have been made thus far!

                  Originally posted by gybe View Post
                  I have scheduled an appointment at the Austrian Mazda repair station, which is the most advanced Mazda workshop there is in Middle Europe, for a diagnosis. We will see what tomorrow brings. Wish me luck!
                  Good Luck! Please let us know there diagnosis!
                  sigpic

                  Comment

                    #10
                    Okay, guys, now you just won't believe. I have been there, I drove their mechanic for 10 miles just to verify that surging is still present. He noticed it and said to me it's probably the clutch... or maybe something else. Meanwhile we discovered that my, both L and R, half axle's are worn (well, the joints). We will repair that on monday since it wasn't in correlation with surging at all.

                    What we did? We measured the compression (3rd cylinder was a little bit lower that other three but they assured me it is fine) and then we swapped spark hotwires (high-tension lead) just for the final test before we go any deeper into the transmission/engine. We discovered that hotwires that I have had previously (a used pair and also brand new pair, not even 3 days old) were sillicone cable ... which is probably NO GO for these engines. We have put on the original Mazda hotwires and my baby drives like butter!!!
                    Last edited by gybe; 09-21-2007, 08:56 AM.
                    Garage: Mazda Protege 1995, Z5 engine, MTX, P/S, no A/C, no ABS.

                    PM me if you need: comprehensive Autodata information; Mazda's 2nd generation workshop manual; Mazda's Z5 overhaul workshop manual.

                    Comment

                      #11
                      Sorry for typos, but I'm just so excited that my baby is back!!

                      Thanks for the participation, everybody. And thanks for letting a newbie being the pain in the ass.

                      Let's celebrate.
                      Garage: Mazda Protege 1995, Z5 engine, MTX, P/S, no A/C, no ABS.

                      PM me if you need: comprehensive Autodata information; Mazda's 2nd generation workshop manual; Mazda's Z5 overhaul workshop manual.

                      Comment

                        #12
                        Em... with silicone hotwires I have meant those 'Bougicord' (ironically, in our language 'bougi' means poor) which are actually aftermarket hotwires.
                        Garage: Mazda Protege 1995, Z5 engine, MTX, P/S, no A/C, no ABS.

                        PM me if you need: comprehensive Autodata information; Mazda's 2nd generation workshop manual; Mazda's Z5 overhaul workshop manual.

                        Comment

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