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Wiz Au Profile
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Date Registered: 06-2017
Location: Canberra, ACT
TOTAL POSTS: 126
Reply | QUOTE
Re: 'hunting' idle


quote:

uppo72 wrote:

quote:

Wiz Au wrote:

I hope this is related, but until I find a 2011-2013 T31 TL auto diesel to buy, I thought I'd buy a cheap T30 for now. I went to look at one on the weekend, and after it was warmed up, it started revving high and sorta "hunting" by dropping the revs, then revving high again. Bit like 'cutting out' to lower the revs every 15 seconds, but consistently revving 1700-2000rpm.

Now here's where it gets interesting....

It only did it in Park & Neutral...and when hot...which is why the owner never discovered it. (Who leaves their car idling in Park or Neutral when hot? You park the car and turn it off.)

So in Drive, Reverse, or any gear, it idles normally @900rpm. The issue is only present when hot, in Park or Neutral! Driving the vehicle showed no signs of anything abnormal, as long as you have it in Drive, or Reverse. I suspect if you flipped it into Neutral when stopped at the lights the issue would show, but then who does that often either?

At first I suspected a temperature sensor, but after reading all of this, I can't help think that if it doesn't do it in Drive or Reverse when the engine is under load, it has to be ECU/electrical/Idle settings?

I've suggested he try the idle re-learn procedure, or take it back to the mechanic that last worked on it.

I found out the car had recently had the exhaust manifold replaced on it due to the original cracking. I worry that if the manifold came complete with CAT and O2 sensor, then even though the CAT recall was done, the used part they installed might NOT be the 'recall' part, but an old one that missed the recall. But either way, if the ECU had 'learnt' an idle setting with a cracked manifold that is no longer present, wouldn't it also re-learn with the fixed one?

In my 'other' world we call this "adaption tables", and we reset the adaption tables every time we do any significant work, like valve clearances, new air filters, replacing O2 sensors, etc.



Hi Wiz, I have recently had this issue that is not fixed. I had my 05 TI services by my local mechanic and now I noticed that the idle flares between 1500 to 2000 when in park. It also seems the auto transmission seem to bump a little if you take your foot off the accelerator as well. I took it back to the mechanic and he is unsure why. He did clean the throttle body and replaced the plugs which he said were pinging badly. I wonder if this means the idle had fixed in a poorly tuned state. None of these issues was apparent before the service. Should I get the idle reset as a matter of course?



I don't know for sure, but I believe that was all that was done to mine before I bought it. I have just been putting up with the drop in idle (and stalling) immediately after starting when hot. Now I just rev it a bit and put it into a gear quickly after starting when hot. Hoping it will 're-learn' over time like my bike does.



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2004 T30 series II, Ti for now.
JRR50 Pathfinder, QD32ETi Turbo Diesel, with 'lots o fruit'.
Eventually looking for a white or silver 2011-2013 T31 TL (Diesel) to "pimp out".
28/Oct/2017, 11:29 pm Link to this post Send Email PM   Send Private Message Blog
 
uppo72 Profile
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Date Registered: 10-2016
Location: Langwarrin
TOTAL POSTS: 13
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Re: FLARING AT IDLE 1700-2500 RPM.


Hi Thanks for the reply. I am going to go back to the mechanic and get him to reset the idle settings and see how that goes.

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2005 T30 TI X Trail
30/Oct/2017, 12:00 pm Link to this post Send Email PM   Send Private Message Blog
 
uppo72 Profile
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Date Registered: 10-2016
Location: Langwarrin
TOTAL POSTS: 13
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Re:


It also doesn't seem to do the flaring when under load on idle ie when the AC is on or when its in drive but with your foot on the brake.

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2005 T30 TI X Trail
4/Nov/2017, 11:49 am Link to this post Send Email PM   Send Private Message Blog
 
Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 5167
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Re: FLARING AT IDLE 1700-2500 RPM.


1. Check if there is air in your cooling system by turning the heater on full and opening the top of the radiator to check that the coolant level does not sink.

2. Check for vacuum leaks around the while intake system between the MAF and engine, especially where hose clamps are as there could be a split hose.

3. Check if your PCV valve is not internally broken by clamping the hose shut with a pair of vice grips. A faulty PCV valve causes a vacuum leak which the ECU tries to compensate for.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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5/Nov/2017, 8:00 am Link to this post Send Email PM   Send Private Message Blog
 


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