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  • Hesitation just as accelerating

    Hi having just purchased my first Prado after Patrols all my life. Have problem with mild hesitation or cough just as you accelerate from idle. Car runs fine and idles fine. I have done the following to find problem. 6 new coils and new plugs. Cleaned Maf. Cleaned throttle body butterfly. Put a coulple bottles of injector cleaner through in last 3000 k. Still have problems any help please. Petrol 4.0 litre 180k

  • #2
    Any error codes showing? Or stored in memory? Be interesting to hook up a computer and test the throttle position sensor and a few other sensors to see whats happening. Injector pulses etc. It can all be looked at in real time with the right reader.

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    • #3
      Mine was doing the same but cleaning the maf sensor cured it.
      1997 petrol auto, 430 000km. Still going strong.
      2004 petrol auto, 233 000km. Cracked dash and no help from Toyota!

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      • #4
        Thanks Piggy. Had it on computer when first purchased and said it was coils but replaced them. Motor definitely improved but hesitation did not. Should I disconnect battery as I have read on here to reset as well ?once coils done showed no other faults

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        • #5
          Hey all, i have been having the same problem and was wondering, after extensive searching, if any one can tell me the difference between 9091902248 & 9091902260 ignition coils, the one ending in 48 is for earlier models (03-09) and the one ending in 60 is for 09 onward. however any non genuine parts will replace both, so i am just wondering if there is actually any difference. or if any has used the later one in their 120? i have has a look around this site but found nothing, how ever i am very new to chat rooms so please be gentle

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          • #6
            Hi tepeprado.I also used the aftermarket coils, they were a lot cheaper than the Toyota ones.They so far have been great.I still have the small hesitation, but are confident that it is not related to the coils. Currently checking and cleaning every sensor I can locate.My Prado is an early 2004 and just bought the coils online for about $150

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            • #7
              Hey Strutman, thanks so much for your reply I will go ahead and try the 6 non gen ones, however would you mind letting me know the part number you used, it would be much appreciated.

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              • #8
                Could it be old O2 sensors kind of got enough kms for them to not be optimal any more.

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                • #9
                  Thanks will try O2 sensors next.Thanks

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                  • #10
                    Anything further on the O2 sensors Strutman?
                    I have a low idle speed in drive, sitting at about 500rpm......so I'm looking for answers also.

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                    • #11
                      Originally posted by dinodadog71 View Post
                      Anything further on the O2 sensors Strutman?
                      I have a low idle speed in drive, sitting at about 500rpm......so I'm looking for answers also.
                      After I replaced the battery in my 120, the idle speed was way low, almost to the point of stalling. Looks like the learnt air flow values in the ECU get lost when the battery is disconnected, and the default values are for a clean MAF and filter.

                      Cleaned the MAF with TB cleaner and blew out the filter. Runs great now and the idle speed is back to there it should be after a drive around the block.

                      I should have used a proper MAF cleaner, which is about $20 from Supercheap (for example, Liqui-Moly Air Flow Sensor Cleaner). I'm going to re-do it properly with MAF cleaner to make sure there is no residue on the MAF elements.

                      Maybe this is the reason for your low idle speed.

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                      • #12
                        Also having same problem, rough idle at 500rpm, slow taking of first start of a morning, popping sound on first reverse and first take of, low power feels like something opens up at 2.5rpm and there's a burst of power I have an extensive list of things I've replaced and cleaned to figure this one out to no avail needing help on this one!
                        4x new 02 sensors
                        new fuel pump
                        2x new fuel filters
                        new injectors
                        new pcv valve
                        cleaned maf
                        cleaned throttle body
                        checked air filter it's clean

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                        • #13
                          Originally posted by 04Pradogirl View Post
                          Also having same problem, rough idle at 500rpm, slow taking of first start of a morning, popping sound on first reverse and first take of, low power feels like something opens up at 2.5rpm and there's a burst of power I have an extensive list of things I've replaced and cleaned to figure this one out to no avail needing help on this one!
                          4x new 02 sensors
                          new fuel pump
                          2x new fuel filters
                          new injectors
                          new pcv valve
                          cleaned maf
                          cleaned throttle body
                          checked air filter it's clean
                          Did you ever figure this out? I got the same thing now

                          Comment

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