Cocky Posted October 21, 2021 Report Share Posted October 21, 2021 I have a little bit of a jumpy need on my 3.4 PDK hot or cold around 1100rpm I wondered if this was normal? I did wonder if this could be AOS or a slight vacuum leak or just because it's creeping up towards being due a service. I have heard from a Porsche indi that it's uncommon to swap the AOS on the DFI engine but that's one view against anybody on here's experiences. I am planning on getting it in for a service next month & doing the plugs/coils. So doing some research. Thanks guys! Quote Link to comment Share on other sites More sharing options...
Menoporsche Posted October 21, 2021 Report Share Posted October 21, 2021 Read the title, thought this was going to be another of your bike videos... 1 Quote Link to comment Share on other sites More sharing options...
Paul P Posted October 21, 2021 Report Share Posted October 21, 2021 1100 seems fast for idle to me - can't remember hot idle speed on mine ( same car ) - but pretty sure it's below 1000 Previous car ( Audi A4 ) had a PCV valve issue ( similar function as AOS ) - that resulted in fast idle - because the ecu was compensating for it running weak - it eventually threw a CEL with a mixture out of range, and there was a non CEL code of "idling too fast" - so your thinking about AOS maybe spot on. Think it would benefit from a scan for a reader with porsche smarts. Quote Link to comment Share on other sites More sharing options...
Cocky Posted October 21, 2021 Author Report Share Posted October 21, 2021 So I have just been out in the car it revs to 1100 for a few minutes and then drops actually to around 900 it's still got a wobbly needle. However the cars now feeling to lag at times in a few if the low down gears as I am driving along steady away in manual/Sport mode. Any ideas on this one guys and gals? Thanks @Paul P for the above. Quote Link to comment Share on other sites More sharing options...
Paul P Posted October 21, 2021 Report Share Posted October 21, 2021 When my car was due a service ( more specifically plugs ) I had some random issues - not like you describe - mine was a tendency to fire up then immediately die if I had recently started the car - so start, back out of garage, turn off, go get stuff from indoor, restart, die - or start, drive to petrol station, stop, fill up, start die..... Immediately after the die it would restart but seem wooly and a bit reluctant to rev - cleared in seconds but wasn't right. New plugs chased all that away Quote Link to comment Share on other sites More sharing options...
Cocky Posted October 22, 2021 Author Report Share Posted October 22, 2021 Service parts ordered, will await these and get it booked in for an oil change. @map made a good point about me not worrying about driving the car in the wet it's likely my coil pack just playing subtle games with me. Let's see. Quote Link to comment Share on other sites More sharing options...
Lonewolfgjp Posted October 22, 2021 Report Share Posted October 22, 2021 It does sound like a cracked coil pack, I had similar on my 987. It was intermittent and difficult to pin point with the scan tool but the technician pinned it down to at least one faulty coil. I replaced all the coils and spark plugs and it sorted it out. 1 Quote Link to comment Share on other sites More sharing options...
Greenman Posted October 22, 2021 Report Share Posted October 22, 2021 As said, quite a few potential causes unfortunately: spark plugs, coils, blocked injector, fuel filter, sensor issues, MAF etc. Start with the service items and see if that helps. 1 Quote Link to comment Share on other sites More sharing options...
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