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Idle Problem

ransom91

By ransom91,
in Four Door Family & Wagoneers

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ransom91 Enthusiast

ransom91

Posted
Posted

hey

i have recently cleaned my throttle body on my 2001 M35 stagea, and now it wont idle correctly.

i did the relearning and it still hasnt changed.

now what its doing is when i start the car it revs up to 2000 then down to 1500 then back up to 2000 then rests at 1200 and slowly moves down to 800-900, it only does that when it is hot tho, when cold it just revs to 2000 then sits at 1200.

the other problem is when driving arond 60km and i release the accelerator the revs drop down to 600 and the car engine brakes hard then it jumps back up to 1200-1400, its also using more fuel then usual.

does anyone have any clue what is going wrong?

cheers

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GTR260 Proficient

GTR260

Posted
Posted

What was ur purpose for cleaning it? U've probably removed the sealing stuff that seals the butterfly to the throttle body. U can buy the stuff from somewhere, don't know where but. It will have to come back off to apply it

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ransom91 Enthusiast

ransom91

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i was doing the rocker cover gasket and spark plugs and noticed it was ugly looking so i sprayed some brake cleaner on a rag and cleaned inside it, after i did it i found a topic saying do not move the butterfly.. :/

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zei20l Grand Master

zei20l

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do the relearning procedure again, it didnt work the first time. you may need to perform the 2 other steps beforehand. then attempt the throttle re-learn procedure. perform that prodecure when the car is engine warm. ie: operating temperature

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PN-Mad Grand Master

PN-Mad

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Did you actually notice it do the re-learn? Or just think it hasn't worked?

Its quite distinctive - it revs up, drops slowly past 650 to just above a stall then comes up again (you will feel it stutter). You Rev it up to check the reset, and it should idle 650 +- 50 at normal temprature.

I only ask because it is not easy to nail the reset proceedure, and lots of people have trouble with it. It does work though.

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ransom91 Enthusiast

ransom91

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ok i did then learning when the car was warm and it didnt nearly stall when i did it however it did return to around 650 and returned there after reving, however once i turned the car off and restarted it, it went back to idle at 900-1000.

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BigBoyDan Community Regular

BigBoyDan

Posted
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What was ur purpose for cleaning it? U've probably removed the sealing stuff that seals the butterfly to the throttle body. U can buy the stuff from somewhere, don't know where but. It will have to come back off to apply it

Tomie throttle coat from justjap approx $70

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iamhe77 Grand Master

iamhe77

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hmmm so sounds like a trip to nissan :S

Nobody in Adelaide has a Cipher cable?

If you do need to go to Nissan, just ask them if they could plug in their Consult and hit the throttle learn button. Should take all of 30 seconds from when they plug it in (plugging it in should take all of 20 seconds)... but they will prob try to charge you for an our's work

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andy65b Veteran

andy65b

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Posted

If your idle does not set between 650-750, the ECU will not learn the new setting.

Another influence on setting the idle correctly can be the PCV valve. This has a hose running from the drivers side bank to the drivers side of the plenum. If you remove the hose from the Plenum and block off the inlet to the plenum you can try to reset the Idle to see if this has any influence.

Good luck.

Cheers

andy

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ransom91 Enthusiast

ransom91

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If your idle does not set between 650-750, the ECU will not learn the new setting.

Another influence on setting the idle correctly can be the PCV valve. This has a hose running from the drivers side bank to the drivers side of the plenum. If you remove the hose from the Plenum and block off the inlet to the plenum you can try to reset the Idle to see if this has any influence.

Good luck.

Cheers

andy

exactly which hose is this?

and if it resets fine what does that mean?

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scotty nm35 Grand Master

scotty nm35

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It also won't set if there is an engine fault lamp displayed from my experience. It will learn but as soon as I stopped the engine it would go back to 900 revs.

(unless the throttle was damaged, I had to replace it in the end due to a random limp mode fault in the TPS.)

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