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  • #91
    I had replaced the MAF sensor and the exhaust sensors...made no difference. Checked the ABS sensors....these had some oil on them...cleaned, still no difference.
    The only time I made it worse was to clean the MAF sensor and not let it dry correctly.
    I would like to see what Toyota did on your last service..maybe a clue to the 'apparent' problem.
    I changed my driving by pushing in the clutch when slowing down and stopping on the brakes only.
    The regional manager looked at my car and the result from their tests was that there was nothing wrong...left it at that, could not go any further.
    I do have a spare MAF sensor and exhaust sensors if you would like to try them.
    Sold the Prado. Now FJ Cruiser

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    • #92
      Some other things to ponder...
      The high idle is the same as the cold idle. (have changed the thermostat)
      The high idle occurts when the vehicle is travelling at 40 kmh or more.
      The high idle does not occur when the inlet air temperature is above 35 degrees.

      A question..did this occur after fitting a snorkel?
      Sold the Prado. Now FJ Cruiser

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      • #93
        Not sure Jon why the snorkel would make any difference ??? Its only sucking air from windscreen level instead of above the inner plastic guard. I havnt heard of any one else that's fitted a snorkel to their petrol 120 have any issues. You had no issues prior to getting the work done so they have changed or done some thing. Again I don't see the snorkel causing the problem as heaps of other people running snorkels havn't reported the issue. So you ended up selling it eh ??? You have done what I would have done ages ago lol.......Cheers Steve
        Face lift 150 Prado V6 auto. No mods yet

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        • #94
          I only sold the Prado as it was nearly 5 years old. I normally only keep a vehicle for that long.
          As the data from my car was sent to Japan and found to be ok, I went no further, just lived with it.
          The snorkel may make a difference or may not, just that the MAF sensor might be reading a change, just a thought.
          Also, what was done to your Prado prior to the problem occuring?
          Sold the Prado. Now FJ Cruiser

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          • #95
            Sorry to drag up an old thread, but ive had the same problem with my 120 Petrol since Ive owned it and its driven me mad trying to find a fix, if there is any. Mine's an Auto, and my main complaint is that it doesn't slow down much when you release the accelerator pedal, which means that she must use the brake a lot more than should be neccessary. Added to this I consistantly get higher fuel consumption that most othes, and I think this symptom is probably related. Ive done a small test by driving the car at around 60km/h and slipping it into neutral and Ive found that the rpm doesnt drop below 1200-1300 rpm until the car gets to about 5km/h then it suddenly drops to its idle speed of 750rpm. I was just wondering if Im chasing a fault thats not there. Would there be any other Prado owners here that could confirm if theirs does the same?

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            • #96
              Toyota can't /won't fix this 'problem'.
              I have sold mine....
              My fuel consumption is now much better.
              Sold the Prado. Now FJ Cruiser

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              • #97
                vlbaby I just tried this tonight on mine and does the exact same thing. Till I get to just about a stop then it drops down. Now my fuel consumption is not over the top so I would say this is common and not a fault. My mate also has a VX V6 Im going to get him to try it on his next time he's out in it. I would say its normal. Mine wont run along at 40k with no throttle imput as the first post. Yes if I take my foot off the brake it will obviously start to roll forward but not speed up to 40k... Id say you have nothing to worry about. I will confirm again when my mate tries his out as well.....Cheers Steve
                Face lift 150 Prado V6 auto. No mods yet

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                • #98
                  This shows the benefit of having a scan-guage fitted. You will see zeros across the screen on the LPK data (fuel consumption) when the throttle is released.
                  Dave
                  Views expressed are mine alone and are not intended to compromise the integrity of my employer nor offend those who may read such views.
                  Bugger Bali, get out and see Australia before we sell it all to China.

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                  • #99
                    Originally posted by Bushbasher View Post
                    This shows the benefit of having a scan-guage fitted.
                    Wish I could get one of em.


                    Sent from my iPhone using Tapatalk
                    Cheers
                    Blake

                    04 Silver Diesel GXL with lots of stuff
                    [SIGPIC][/SIGPIC]

                    Comment


                    • I bought a scan guage to try and diagnose the problem.
                      All seemed ok, no error codes shown, did reset, etc.. Still the same.
                      I think the only way to try and diagnose this would be to put the vehicle on a Dyno and then see what the throttle body is doing.
                      As the throttle body was replaced on my vehicle, I think there is an input to the ECU that is holding the idle high. Note that even the rear demister has an input to the engine ECU when turned on. Also note that the high idle is the same as the cold idle speed.
                      I was able to make the problem worse when I cleaned the MAF sensor and didn't let it dry properly. A new MAF did not fix the problem.
                      Sold the Prado. Now FJ Cruiser

                      Comment


                      • Just did a service and noticed little rough at idle. Went for a drive and all seemed OK then engine light and few others came on.
                        Everything checked out and then put TORQUE on to see any codes - Had P0171 System too Lean (Bank 1) and P0174 System too Lean (Bank 2).
                        Cleaned MAF sensor after reading here and reset codes. All seemed OK and lights did not come back on although just a little surging when idling...... I was starting to think ECU
                        Read through these again and then checked vacuum lines - noticed one had come off (no idea how) as they don't have hose clips. Once line restored - perfect
                        Nearly spent $350 on a new MAF, so grateful for the good advice
                        cheers

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                        • I have been through this high idle issue with our 2004 GXL V6 enigne that was fully rebuilt at 167,000kms ( now 210,000kms) and the high idle just started happening out of nowewhere.
                          I know the Owner of EFI Automotive Parts & Diagnostics who is the Perth Guru for electonic issues in modern engines.
                          Smoke tested for vac leaks and pulled the ECU from the car and bench tested with no issues.

                          It turned out a simple fix-

                          The factory Thermostat that was fitted new 3yrs ago when the engine was rebuilt had started failing and engine was not getting up to temp after usual warmup period and was running too cold, so ECU thinks the engine is still in warmup mode hence it keeps idle revs up despite the engine well past warmup stage and road driven all day and still idles too high
                          Swapped in a new factory Thermostat (it is all one unit which includes the plastic housing from Toyota - costs aprox $90) and problem solved immediately

                          Also another simple known cause that can happen which results in Vac leak -
                          The rubber hose on the left side of the intake manifold that can be easily seen with the engine cover off - that comes up and slides onto the plastic fitting
                          It can easily slide off from vibration over time and create vac leak.
                          Just needs a hose clamp fitted so it will never come off
                          Last edited by KRH; 17-04-2021, 09:33 AM.

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                          • Hi KRH,

                            I am just curious with your thermostat issue when the vehicle was on having the diagnostics read what temperature was the engine running at?

                            I am chasing a high idle issue in my V6 Hilux and when going through the diagnostics it is reading the engine temperature at 80deg. when I saw you had solved your issue I was hopeful but then reading what you issue was and seeing what temperature my engine is reaching I am still not sure this would be the same issue for me unfortunately.

                            All the same it would be helpful to know.

                            Thanks,

                            Comment


                            • I am not sure as he would have checked that straight away as he uses a very expensive scanner which is his main tool. It fooled him until he tested with an external thermal gun.
                              Would be worth you getting a smoke test done to see if any vac leaks as a starting point.
                              I was amazed that a factory Thermostat failed after a couple of years but shit happens i suppose and it was an easy fix
                              Assume you have gone thru the usual checks & cleaned your MAF and your O2's are good

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