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2G Idle surge but... not everytime...

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Heryst78

Proven Member
121
11
Feb 9, 2017
Paris, Europe
Hi everyone :)

I had a new problem today...

I explain, i changed all the intake gaskets, for everything, TB, intake, injectors etc...
a few weeks ago, i did an adjustment of the BISS and ISC.
I checked for a potential leak, nothing.

So !!!
When i start the engine, my idle is good.
When i’m on park, my idle is good.
When i drive, and when i stop at a Light, my idle up and down between 1200 and 1600 rpm.
I stop the engine and start again, and everything is good.

Do you know where can be the problem ?
Too, i had a CEL today, P1104.
There is a link between them ?

Thanks :)
 
P1104 is turbocharger wastegate solenoid, it's either unplugged or has an electrical short. It is under the coolant reservoir on the frame rail.

Make sure you have no vacuum leaks, the motor is not making any hissing noises. I highly suggest performing a boost leak test to find everywhere that air can escape.

Rotating idle is from the idle air control valve

To set the biss the car must be fully warmed up, and the rpm range must be set at 850rpm Max and 650 rpm minimum. This should be done in neutral with the car fully up to temperature after driving for a while.
 
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