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  • Engine tick/knocking noise

    Hello everyone. I have recently acquired the #29 contour svt from blu_fuz, and I absolutely love the car. Most solid contour I have ever driven, and it is very solid. I fear the engine may be on its way out though. I can hear a ticking noise while inside the car if I accelerate, but it is only while accelerating. Everything sounds perfectly normal if coasting or lightly accelerating. It ticks louder the harder you press the pedal, and the tick noise increases with the rpms. I just drove the car about 400 miles all highway, and the engine did not feel bad, and actually got fantastic fuel economy. I can hear a kind of ticking/knocking noise while the engine is idling though. My main fear is that it could be rod knock, but I also feel like I surely would have thrown a rod on a long trip like that if the rods were the problem. I also do not necessarily want to go 3L if the engine fails because I want to try to keep the car all original if possible. If anyone knows what it may be, please let me know. I still have to drive the car another 500 miles home from where I am on vacation. I could try to post a video if that may help.

    John
    98 SVT - Daily
    93 LE Miata - Track day/weekend car

  • #2
    update: When the engine is cold the noise is either really faint or not really there. When the engine is completely warmed up the noise is mostly audible.
    98 SVT - Daily
    93 LE Miata - Track day/weekend car

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    • #3
      If the noise is faint or not there when cold and gets louder as the engine warms up, especially when under load, then it sounds like the beginning stages of rod bearing failure. Check your oil level, and look for metal shavings on the drain plug. You can even stick your little finger in the drain hole, if not too hot, and see if any metal shavings are there. If everything checks out ok, it still sounds like you are starting to hammer a bearing, so be careful with your right foot! Sorry to be the bearer of bad news, but its best to deal with this before major damage occurs.
      '99 CSVT # 2507
      SF/MNB
      BAT suspension, Nautilus brake conv.
      '65 Mustang coupe
      '74 260 Z

      Comment


      • #4
        If the noise is faint or not there when cold and gets louder as the engine warms up, especially when under load, then it sounds like the beginning stages of rod bearing failure. Check your oil level, and look for metal shavings on the drain plug. You can even stick your little finger in the drain hole, if not too hot, and see if any metal shavings are there. If everything checks out ok, it still sounds like you are starting to hammer a bearing, so be careful with your right foot! Sorry to be the bearer of bad news, but its best to deal with this before major damage occurs.
        '99 CSVT # 2507
        SF/MNB
        BAT suspension, Nautilus brake conv.
        '65 Mustang coupe
        '74 260 Z

        Comment


        • #5
          I still have to drive it 500 miles home. Can you replace the bearings with the engine in the car? Is it too difficult? When I checked the dipstick and looked under the oil cap everything looked pretty clean and fresh. I do not want to get rid of this car, it has too much history and the cool early build number. Any advice proceeding? I also have a video posted in my duplicate thread that I will post here https://www.youtube.com/watch?v=-G8K...ature=youtu.be
          98 SVT - Daily
          93 LE Miata - Track day/weekend car

          Comment


          • #6
            its not cost effective to just replace the bearings because I believe other parts are damaged as well. Engine swap is the easiest and least time consuming. Yea the video kinda sounds like beginning of rod knock.
            98 EO SVT Deleted Cat/Blue Chip in PCM/Foglight Mod/Moosing Fix BAT struts/spring Carbon Fiber Cowl Hood & Carbon Fiber Nascar Trunklid

            2000 Red/Tan SF connectors/ frontnrear strut braces, BAT struts/springs B&M shifter, Bosal Exhaust/ Dynomatted,

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            • #7
              I have also been driving the car around town, and it doesn't seem to be getting any worse. I can not really hear any noise while driving with the windows down. I can only hear when the car is at idle or the windows are up.
              98 SVT - Daily
              93 LE Miata - Track day/weekend car

              Comment


              • #8
                If you have been driving the car and it isn't getting worse I am going to go out on a limb and say its something else. Have you listened around the front cover to see if it is timing chain related?
                - 12 Focus SE
                - 99 Contour SeVT <- 3L/NPG Turbo
                - 2k Contour SVT - #2137

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                • #9
                  It seems like the noise is coming from the back left of the engine bay if you are looking into the engine bay from the front of the car. I have not stethoscoped it yet though.
                  98 SVT - Daily
                  93 LE Miata - Track day/weekend car

                  Comment


                  • #10
                    Yes take a closer listen. Could be a pulley, chain tensioner, etc. Fairly certain that rod knock sounds like its from the top end, and I don't think there is any directionality to the noise. If a rod bearing was going to go, it is going to go. There isn't any driving hundreds of miles on it.
                    - 12 Focus SE
                    - 99 Contour SeVT <- 3L/NPG Turbo
                    - 2k Contour SVT - #2137

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                    • #11
                      I've also seen the plastic on the chain tensioner guide break off at the end of the guide which could cause the loose plastic to slap back and forth against the guide. The ratchet style tensioner itself seemed to be fine in this case but if that plastic has broken off, I could see that maybe being your issue. If you could get a camera/scope in your oil drain plug to see if there's any plastic in your pan, you might find that as your issue.
                      my rides;
                      04 Marauder. Black MNB 98.5 svt 3.0L. 2000 Silver Frost MNB svt.

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                      • #12
                        Yeah, I just drove the car around town today and the ticking I really think is an exhaust tick, and then I can kind of hear the knock only when stopped pretty much. It is impossible to hear while moving. It is easiest to hear with the hood open and stopped. I will take a closer listen when I can this afternoon
                        98 SVT - Daily
                        93 LE Miata - Track day/weekend car

                        Comment


                        • #13
                          The screw driver made the most noise from what I could tell in the back left corner on the corner of the valve cover. I took another short 20 second video that could maybe help anyone tell what it is. https://www.youtube.com/watch?v=ZbZf9XAeBAw
                          98 SVT - Daily
                          93 LE Miata - Track day/weekend car

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                          • #14
                            Use that 2.5 for a boat anchor, and 3L that thing. Lol
                            -Brent
                            2000 Silver Frost SVT Contour 3L #1633 of 2150
                            2009 F150 FX4 Blue Flame/ Sterling Grey
                            1979 Mustang Notchback 357CI Windsor Street/Strip/Show

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                            • #15
                              I have to make it home first! I do not have tons of money to throw at the car, but I definitely see the awesomess of a 3L. I would have to stay with the stock 98 diff since I would be on quite a tight budget. I want to get as much life out of the 2.5 that I can though. I love that lil engine. Slightly off topic, but would the 3L sound pretty much the same? Also, anyone else think they may have an idea?
                              98 SVT - Daily
                              93 LE Miata - Track day/weekend car

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