WOKA Posted 6November, 2017 Report Share Posted 6November, 2017 On the recent run that we did down the Oxley I noticed that the 996 is running very slightly 'off' when not on the pedal.. Its like its almost missing, and is spark / coil related - not that I'm in any way knowledgeable in such things. Under acceleration it's great, pulls hard and does all the right things, however when sitting on the speed limit and just holding off the pedal it ever so slightly misses and holds back a bit, but as soon as you touch the accelerator, no problem at all.. I did also notice as part of my 'assessment' that if I coasted down a hill the idle would drop and stall. Idle when stationary is fine. On start up, everything seems fine however before the last service on startup it would very occasionally (3 times from memory) fart and cough a little bit you could rev it out fine. A bit of injector cleaner was put through and that for the time being seems to have gone away.? Maybe though related to above..Any pointers on the primary issue..? TIA Link to comment Share on other sites More sharing options...
Fraz Posted 6November, 2017 Report Share Posted 6November, 2017 You might want to give the throttle body and MAF a clean. https://rennlist.com/forums/996-forum/265059-cleaned-my-throttle-body.html Link to comment Share on other sites More sharing options...
dan_189 Posted 7November, 2017 Report Share Posted 7November, 2017 Get a code reader to see if there are any errors logged in the DME. If you're in Melbourne I can scan your 996 with my PIWIS II to see if anything comes back. If not dealership/Indy can scan for you. Link to comment Share on other sites More sharing options...
TrevMcRev Posted 7November, 2017 Report Share Posted 7November, 2017 Can also be early signs of AOS failure. When idling, listen for sounds of it sucking air. Link to comment Share on other sites More sharing options...
WOKA Posted 7November, 2017 Author Report Share Posted 7November, 2017 Can also be early signs of AOS failure.When idling, listen for sounds of it sucking air. Umm.. I hope not. AOS was replaced less than 10,000km ago. Is it possible for it to fail so soon after.?Where would I place my ear to hear this sucking of air..? EDIT A quick google suggests on idle and when removing the oil cap the engine might stall if the AOS is failing - not the case here, if anything idle increases very slightly..Anyone got a link for a scanning tool that they could recommend..? Link to comment Share on other sites More sharing options...
dan_189 Posted 7November, 2017 Report Share Posted 7November, 2017 There are ones made by Bosch that supercheap sell, otherwise durametric or PIWIS. Each option is least expensive to most expensive. Link to comment Share on other sites More sharing options...
Uncle Posted 7November, 2017 Report Share Posted 7November, 2017 Bugger I had my OBD port scanner with me on the weekend. For P car stuff durametric seems like the go. Link to comment Share on other sites More sharing options...
dan_189 Posted 7November, 2017 Report Share Posted 7November, 2017 Durametric is the easiest route other scanners don't do what the durametric can Link to comment Share on other sites More sharing options...
Rob Posted 7November, 2017 Report Share Posted 7November, 2017 Any pointers on the primary issue..? Probably nothing trivial... Link to comment Share on other sites More sharing options...
WOKA Posted 8November, 2017 Author Report Share Posted 8November, 2017 There seem to be several durametric scanners.. Just to be a pain - can someone link me to what I need.. Cheers @Rob.! Appreciate the input Link to comment Share on other sites More sharing options...
dan_189 Posted 8November, 2017 Report Share Posted 8November, 2017 There seem to be several durametric scanners.. Just to be a pain - can someone link me to what I need.. Cheers @Rob.! Appreciate the input There are only two types that can be used with the 996:- Enthusiast (locked to 3 VIN numbers) however apparently Durametric can wipe VINs - also certain coding functionality cannot be done with this version- PRO (which can be used with unlimited VIN numbers)They are often on US ebay with 1-2 VIN spots un-usedBefore you go down the Durametric path, if you're in with your local dealership I don't see why they wouldn't do a quick scan for you to see if you get any codes.Although its probably a decent investment: http://www.durametric.com/porsche-carrera-996.aspx Link to comment Share on other sites More sharing options...
Stephen Tinker Posted 8November, 2017 Report Share Posted 8November, 2017 I can recommend Durametric - bought my Enthusiasts model back in 2010 and found it paid for itself many times over in time and frustration. Durametric are also very cooperative with questions by answering emails the same day....Money well spent and you would still get 50% of the retail price back when you sell it. Woka - describing your hesitation, try disconnecting your MAF and then drive the car to see if there is any improvement. A failing MAF can cause all sorts of symptoms and disconnecting it for a short time will not do any damage. Link to comment Share on other sites More sharing options...
Russ Posted 9November, 2017 Report Share Posted 9November, 2017 There seem to be several durametric scanners.. Just to be a pain - can someone link me to what I need.. Cheers @Rob.! Appreciate the input bring it round sometime, i have a durametric pro (drop me a PM)I'm guessing coils but we'll seehave you tried an italian tune up? Link to comment Share on other sites More sharing options...
WOKA Posted 9November, 2017 Author Report Share Posted 9November, 2017 bring it round sometime, i have a durametric pro (drop me a PM)I'm guessing coils but we'll seehave you tried an italian tune up?Cheers Russ - I'll drop you a PM.. Yep - certainly did try the Italian tune up No change. Link to comment Share on other sites More sharing options...
DT Posted 9November, 2017 Report Share Posted 9November, 2017 bring it round sometime, i have a durametric pro (drop me a PM)I'm guessing coils but we'll seehave you tried an italian tune up?Coil(s) seem a likely culprit given they're prone to cracking and letting moisture in. Link to comment Share on other sites More sharing options...
Rob Posted 9November, 2017 Report Share Posted 9November, 2017 have you tried an italian tune up?I expect it had one of those trying to keep up with Jason E's S2 on the trip south... Link to comment Share on other sites More sharing options...
Pokiou Posted 13November, 2017 Report Share Posted 13November, 2017 Id suggest the following, make sure you have good fuel, make sure you leads and spark plugs are not fouled up. Make sure no sensor leads and plugs are gone/unplugged and finally id check to make sure the Air Flow Sensor is plugged in and nothing has moved. Other than that, get a diag tool on it and see what it says. Link to comment Share on other sites More sharing options...
WOKA Posted 13November, 2017 Author Report Share Posted 13November, 2017 All good and it seems to be sorted.. Went around to @russ and plugged in his scanner tool.. Errors relating to the MAF were detected. A bit of a spray with MAF cleaner, an Italian tune and all codes clear when re-scanned. Thanks Russ, legend.! Link to comment Share on other sites More sharing options...
Fraz Posted 13November, 2017 Report Share Posted 13November, 2017 All good and it seems to be sorted.. Went around to @russ and plugged in his scanner tool.. Errors relating to the MAF were detected. A bit of a spray with MAF cleaner, an Italian tune and all codes clear when re-scanned. Thanks Russ, legend.!I knew it, good result. 9-10 times it's the simple stuff. Link to comment Share on other sites More sharing options...
Stephen Tinker Posted 13November, 2017 Report Share Posted 13November, 2017 As I said last Wednesday, the MAF can cause all sorts of issues, especially if you have a K&N style aftermarket air filter......You may find that just cleaning an old MAF sensor will not be a permanent solution. Link to comment Share on other sites More sharing options...
WOKA Posted 13November, 2017 Author Report Share Posted 13November, 2017 As I said last Wednesday, the MAF can cause all sorts of issues, especially if you have a K&N style aftermarket air filter......You may find that just cleaning an old MAF sensor will not be a permanent solution. I'll be swapping out the K&N with an original box in the next day or two.. Link to comment Share on other sites More sharing options...
dan_189 Posted 13November, 2017 Report Share Posted 13November, 2017 I'll be swapping out the K&N with an original box in the next day or two.. I've read about the K&N air filter setup as well as their air filter inserts causing issues. Good move replacing it back to stock, intake noise will be quieter but it's not worth not causing issues and sucking in hot air from the engine bay. Link to comment Share on other sites More sharing options...
Russ Posted 14November, 2017 Report Share Posted 14November, 2017 I think the big problem with the reusable (non-paper) filters is over-oiling them and it coats the MAFand yeah, the stock airbox picks up air from a particular designated spot, the pod filter just sucks in hot air. Although, the TechArt pod filter came with a shrowd and cold air intake setup Link to comment Share on other sites More sharing options...
dan_189 Posted 14November, 2017 Report Share Posted 14November, 2017 I had a BMC reusable filter but couldn't see any benefit only negatives so I went back to stock paper.In terms of aftermarket air boxes (if I had to choose one) the evoMS gets my vote and it sections off the pod filter from the engine bay and still uses the stock air intake spot to feed the pod filter: Link to comment Share on other sites More sharing options...
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