Rough Idle on 1.8T (AEB) engine

[K7ERG]

Looking for some pointers on how the idle is up and down on my 1.8T engine. Engine runs fine but at traffic lights/junctions the idle drops and goes up and down. Not had it on Vagcom but will be looking to do so soon.

Thanks in advance

Craig

 

[Biglockie]

idle speed control valve? either that or a MAF fault

 

[HTC]

Check for vacuum leaks.

 

[Markey]

Could be a split breather hose as well as the above ^^^^

There is a plastic hose under the intake that is like an L shape that can brake in the middle this was gone on my car and causeing a ruff idle and a bit of hunting.

 

[K7ERG]

cheers for the replies
at the moment no EM light flashing up.
MPG i am getting around 300 to 330mile to a full tank to about 20mile left on range. Is this about right for a standard car.????

Craig

 

[Markey]

Yeah thats good i get about that and somtimes i once got 360 that was with a dead turbo as well.

Have a look at the hoses and that one under the inlet mani and then try and get VAGCOM hooked up.

 

[K7ERG]

cool so not to far out with the MPG.

Is there any point in changing the inlet manifold to the same as found on the Seat, VW. ( the one with the Throttle body at the end instead of the one like the URS4 AAN engine)

Oh and the gearing is longer than i thought with 18" wheels in 3rd 105mph before limiter.......

Craig