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low idling problem.


Kol12

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I have some trouble with the idle on my 99 TT Legacy. When the car is sitting still idling it sometime drops very low to the point where it feels like it will stall. When the cars moving and I'm coming to a stop with the brakes the revs drop very low when the car has stopped also feeling like it might stall. Does anyone know what the cause of this could be? 

Edited by Kol12
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5 minutes ago, Kol12 said:

That sounds like fun! :/ I take it it's not as simple as just adjusting the idle?

 

It could be a lot of things. But if your idle was fine before - Then turning up may help but you wouldn't have solve the route of the problem. Ie if their was a small vac leak, you could turn the idle up to fix it, but if the leak got worse, you'll start having issues elsewhere :)

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Spray brake cleaner over all the vac lines (from end to end) and around any intake manifold gaskets when idling... any change in idle due to spraying the brake cleaner will indicate a leak. Also you can squeeze each vac line in turn with some pliers... again, any change in idle means you have found the leaking vac line.

Edited by Loren
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I got all the work done on my car today. :) Rear diff bushes and seal/diff oil change, trailing arm bushes, front left axle boot and a full service. The possible culprit of the rough idle could have been the air filter, it was munted!! absolutely had it.. Scan tool went on with no error from the air flow meter... It's too soon to know if the idle is still an issue but will monitor it in the next few days. Will it take some time for the ECU to adjust to the new air filter and correct the fuel ratio?  

Edited by Kol12
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