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 High Idle Problem.  

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Nvious
  • Nvious
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  • Member No.: 31
  • Joined: 4-October 02
  • Posts: 13,154
Post #1 post 9th August 2006 - 12:09 AM
Hi.

What could be the symptoms of my U13 SR20DET idling high?

I've come to conclusion on a few things..

The U13 SR20DET ecu is AUTO... causing it to idle high.

JapspecSSS said "IAC valve or motor is dirty"..

But yeah, Twincam16 hasn't found the time... to um. fix it for me. (I'm not mechanically minded).
Twincam16 said he used the DET iacv motor etc..

Should the DET one be used? or was it the DE?

Fitted an aftermarket BOV to it also.. it doesn't go off as I noticed when I change gear the revs go up.... cause all i hear is .. foo foo foo.. Flutter.

the high idle was also in place when it was stock.... (stock front mount.. then went to no intercooler to get mod plate..) now it has stainless steel piping etc..

Also when I come to a stop.. the idle drops to about 1,000rpm then rises again :S to 1,500rpm.

The problems stated above occurred from the beginning.... But yeah Twincam16 said the idle will drop.. but it didn't :S


Heres a few other replies I got..

QUOTE
Has it only happened since fitting the new BOV? If so, I would say the BOV has a leaking diaphragm.

Otherwise, the IACV under the inlet manifold should be cleaned. It could be filled up with dirt and causing too much air to enter the engine.


QUOTE
sounds like a vacuum pipe leak. check the pipe that goes to the BOV has got a vaccum signan and not just boost, could be the pipe has popped off the BOV and is leaking air into the motor at idle, but if the pipe has come off the BOV it should be leaking under boost.


QUOTE
And, the BOV needs to get a manifold vacuum/pressure signal as well, instead of connecting to say the wastegate actuator line. This is because the atmo venting ones have a lot of spring pressure on the piston. They require vacuum on the backside of the piston as well as boost pressure on the frontside to open them properly, otherwise they just make the turbo flutter like mad and don't vent properly.


QUOTE
Also check the FICD (Fast Idle Control Device), disconnect the air hoses and block it up. If the idle drops, then the bimetal spring and disc are not closing properly.


This post has been edited by Nvious: Aug 12 2006, 06:31 PM

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Mr_Sleepy
Post #2

well, all of those suggestions are really good. theres nothing else i could suggest because you seem to have covered all the possible problems.

if you have a det motor than use the det idle controll valve as there buit for positive pressure in the manifold

are you using a manual box with the auto computer? if so it could be that you havent hooked up the speed sensor and the computer is trying to compensate.. ive heard of that problem heaps..

i would suggest that you eliminate each problem one by one.

Robinator
Post #3

don't these have idle adjustment on the throttle body?

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