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Date Registered: 02-2013
TOTAL POSTS: 23
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Engine Idol Control


I have a 2005 T30 X Trail that had LPG fitted at 90,000Ks .It just lost compression at 160,000Ks because off valve seat recession. I should have had the valve clearance redone long ago.Anyway after getting a head to soot LPG fitted all is well except the engine revs from 1500 rpm to 2000 rpm then back to 1500 rpm non stop until you put into drive then all is well.Over two weeks the ECU has not fixed it .Any ideas on what is wrong.There is no Cat Converter in the Exhaust Manifold now to damage the cylinders .Important for LPG use.Could this be why?.No fail codes on the dash to show anything is wrong.My Mechanic gave up.

Last edited by 2stroke, 1/Jul/2016, 1:12 pm
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Revhead Kev Profile
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Engine Idol Control


Hopefully you have another cat convertor fitted further along the exhaust system or it will be illegal for registration.

Try the idle relearn procedure as the butterfly on the intake valve may have been manually moved during all the work.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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Date Registered: 02-2013
TOTAL POSTS: 23
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Re: Engine Idol Control


I will have to take it Nissan I think.It starts OK just a high idol speed going up as the engine worms up then at 2000.rpm it gets knocked back to 1500rpm then it climbs back again over about 2 seconds.Reset as many things as I can.I gave it to the mechanic to fix the head problem & now have this to live with.He has done 100,s of X trails but this he could not fix.
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Engine Idol Control


Did you or your mechanic do the idle relearn ?

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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3/Jul/2016, 9:18 pm Link to this post Send Email PM   Send Private Message Blog
 
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Date Registered: 02-2013
TOTAL POSTS: 23
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Re: Engine Idol Control


The Best electronic devise a Mechanic can buy was used to do everything possible.The ECU shows nothing wrong.As I only have one oxygen censer before the Cat I dont think the lack of the Cat can have anything to do with it .Perhaps the Oxygen censer was damaged when the cat was removed but I am only guessing.The crank shaft censer was changed at 100,000K but not the Cam censer .It was all running perfect when it went to the mechanic except for the lost compression.
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Engine Idol Control


Get him to do it infront of you so you know it has been done correctly.
It entails the engine starting and then it goes through a process of gradually lowering the idle speed until the engine nearly stalls before raising it again to the correct speed.
It has to be done with the aircon off and all lights off and in neutral or park so that there is no load on the engine.

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Kev X450(c) T30 Guru
03 Titanium Ti T30 Series 1 **MODIFIED**
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Date Registered: 02-2013
TOTAL POSTS: 23
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Re:


He did this when I was there using the computer.I remember it almost stalling.It was on Petrol also when tried.He says this is the only EX he has not been able to set the idol & is stumped why.

Last edited by 2stroke, 11/Jul/2016, 11:53 am
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Date Registered: 02-2013
TOTAL POSTS: 23
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Re:


Problem Solved.My Mechanic told me to take my Ex into Magic Nissan on Leach Highway, Perth WA & they will fix it.They did it cheap & fast.I was told the LPG was the reason for the Drama but all is fine now .LPG and all .

Last edited by 2stroke, 15/Jul/2016, 10:24 pm
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Date Registered: 10-2006
Location: Mona Vale, Sydney, AUSTRALIA
TOTAL POSTS: 6355
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Re: Engine Idol Control


So what did they do ?

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Kev X450(c) T30 Guru
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Date Registered: 02-2013
TOTAL POSTS: 23
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Re:


They would not tell me much at all but my Mechanic says he has bean told by other Car Mechanic he knows this same problem has happened to other Ex trails worked on and they were sent to Magic Nissan,s also to be fixed.Runs perfect again now anyway.LPG also.ECU reasons I Guess.
15/Jul/2016, 10:31 pm Link to this post Send Email PM   Send Private Message Blog
 


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