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  • Idling Issue

    I Need some advice i have a 04 toyota prado which i have had for 3 weeks now, i had major 200000km service done 2 weeks ago so service wise it is all up to date baring changing the Ignition coils this week when they arrive, the car drives perfectly no issues but whenever I stop the idling vibrates constantly and is doing my head in so I would like some urgent advice on this and if anyone has had the same problem and what they did to fix the issue. Thanks Sean

  • #2
    Is it ignition or fuel? Broken engine mount?

    Unplug each coil pack one at a time then put it back on. Only have one unplugged at any one time. If the idling gets worse its not that pack. If you get to one that it seems to make little difference. Stop the car and swap that pack for another, repeat the test. (Your problem should have moved with the coil pack location). Replace coil pack.

    Have you changed the plugs? Are they gapped correctly?

    Fuel filters. Swap them out. Replace air cleaner if its not new.

    A good scangauge should be able to show what each cylinder is doing anyway. (Or techstream). Your's is an 04 so likely no OBD which makes it harder. You'll need Toyota to look at it or a mechanic with appropriate scan tool.

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    • #3
      Hey piggy the engine mount is fine and it is the engine vibrating and sounding like its missing as well and also it does have a obd2 plug, the 6 new coils arrived yesterday so I will change them in 2 days and see if that helps as the coils have never been changed and the car has done 228000km after doing the coils if no fix I will pull out injectors and clean them, i did have it into toyota 1 week ago and they are saying its the 4 oxygen sensors that need to be replaced but that is a very expensive trial so want to do these things first and then last resort will be to change the sensors, the major service I had done on it 2 weeks they changed every filter in the car and changed all the oils in car and put new thermostat and radiator coolent and i have done mass airflow sensor clean and also have cleaned the throttle body so if you have anything else you can think of please let me know. Thanks Sean

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      • #4
        You can buy the 4 O2 sensors for around $450-600 genuine from amayama or partsouq etc. . I know of a passenger side rear O2 brand new in box (genuine) someone is selling for $100 if you are interested, PM me if so.

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        • #5
          Whats the rear passenger o2 sensor, i thought there were only 4 o2 sensors. Thanks

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          • #6
            Also I put the 6 new coils in today and no change still vibrating

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            • #7
              I had an idle issue over the last few months (which I've now solved). So I thought I'd share as it might help the OP.

              I had two symptoms that seemed related.

              First was that when idling in drive the revs would drop too low and I thought the engine was going to stall (but never did). Got down to under 400rpm sometimes. Idle rpm was always inconsistent and there was always hesitation when moving off idle. I know once the battery has been disconnected/replaced - it takes a bit of driving for the engine ECU to sort out the idling but my issue would never recover and never seemed correct.

              Second issue - when free revving the engine in park from idle - There was always a distinct stutter/miss off idle when I mash the throttle pedal. Easy to replicate every time regardless if the engine is hot or cold.

              As this was only an idle issue, and didn't matter if hot or cold - I thought this might be a vacuum leak on the intake manifold. Once I removed the top engine plastic cover - I instantly found that the there was an issue with the large fuel vapour line running to the front of the plastic intake manifold - right next to the throttle body. I was initially intending to rip off the upper intake manifold and this hose was the first item I started to remove. It is 8mm ID and takes fuel vapour from the charcoal canister on the left side of the engine bay, via a valve and sends this vapour directly into the upper plastic intake manifold when needed. This moulded rubber fuel vapour hose (around 40cm in length) was very stiff where it connects to the plastic nipple on the intake and easily slid off when I tugged on it (I hadn't even removed the wire hose clamp). It seems it has been letting in excess air into the intake. It was only the last 50mm or so of the hose that was stiff and the remainder was still quite pliable/rubbery. The fuel vapour and heat has taken its toll over time on the rubber. Anyway - I luckily found some 8mm fuel hose in my shed and quickly made up a new length that mostly matched the original - it was flexible enough to bend as needed. I did not touch anything else once I replaced this hose and quickly started the engine and mashed the throttle pedal. Stutter problem gone away instantly.

              On closer inspection of the old hose afterwards - the end of the old hose had a 20mm long hairline split.

              Before I started ripping everything apart, I was fully expecting to have to remove the plastic intake manifold - suspecting the manifold seal was gone. Couldn't believe the issue was the first thing I touched once I removed the plastic engine cover. My local Auto-one had some intake gaskets in stock if needed so I didn’t pre-buy them luckily thought had already bought some new sparkplugs which I put in later on in the day. The certainly needed replacement in the end.

              Hope this helps as I would imagine everyone's else Prado V6 would have this same hose in similar condition to mine. My Prado is a 2005 with 280k. Sorry – no pics taken on the day but have attached is a snippet from the Toyota online part catalogue of the hose in question.



              PS. I still have another (hopefully) unrelated minor engine issue though. When the engine is (only) cold after initial startup – it has some minor hesitation/surging when under moderate to hard acceleration. Well for the first 30-60 secionds of running or so then it's completly gone (open loop fuel control only it seems). Anyway - I'm determined to get to bottom of this strategically – fuel/air/spark.


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