Meridianmet Posted January 11, 2022 Report Share Posted January 11, 2022 Hi, I started my 01 2.7 yesterday, and it was a rough idle, and was misfiring when given a bit of a rev, this goes after a few seconds of the car running, and it drives fine. I had a look at various threads and forums, they seem to indicate either coils or AOS. Any other suggestion are welcome, and where to start to diagnose the fault. Thanks, G Quote Link to comment Share on other sites More sharing options...
iborguk Posted January 11, 2022 Report Share Posted January 11, 2022 Hi, suggest get it on a decent code reader. Quote Link to comment Share on other sites More sharing options...
iborguk Posted January 11, 2022 Report Share Posted January 11, 2022 (edited) There are cheap, code reader options which will read the non-Porsche specific codes ,this is a good one mind... Edited January 11, 2022 by iborguk Quote Link to comment Share on other sites More sharing options...
Paul P Posted January 11, 2022 Report Share Posted January 11, 2022 Whereabouts in Kent are you? - If you are anywhere near me ( Strood ) then happy to plug in my PIWIS diags system and see if the car is reporting any misfires - would help in narrowing the options. Let me know if I can help. Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 12, 2022 Author Report Share Posted January 12, 2022 Thanks for the offer Paul, I'm a bit further away, near Tenterden. I think I'm going to book it in at Maistone Sports Cars and get it diagnosed as they are only 10 minutes from me. I will post the outcome. Quote Link to comment Share on other sites More sharing options...
Paul P Posted January 12, 2022 Report Share Posted January 12, 2022 7 minutes ago, Meridianmet said: Thanks for the offer Paul, I'm a bit further away, near Tenterden. I think I'm going to book it in at Maistone Sports Cars and get it diagnosed as they are only 10 minutes from me. I will post the outcome. Cool. Offer stands if you change your mind. (Or down the line if something else comes up). Quote Link to comment Share on other sites More sharing options...
Thediver Posted January 18, 2022 Report Share Posted January 18, 2022 When my AOS was giving me early symptoms, I was getting a lot of white smoke (like a big cloud) every now and then. My Idle when warm would sit around 900rpm and rise to 1000 at a traffic light. Also the car was acting like it was running rich but that would have been a combination of AOS and a cat leaking. Has it been a long time since you last used the car, before you got the rough idle? Check for any codes first but I am leaning towards coils. Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 18, 2022 Author Report Share Posted January 18, 2022 The car is booked in to Maidstone Sports Cars for Friday morning, it was either there or Project Nine, I went with MSC as they were much more helpful over the phone, PN couldn't have been less interested, this is the price to look at it, nothing else. Both are about the same distance from me. Quote Link to comment Share on other sites More sharing options...
Paul P Posted January 18, 2022 Report Share Posted January 18, 2022 3 hours ago, Meridianmet said: The car is booked in to Maidstone Sports Cars for Friday morning, it was either there or Project Nine, I went with MSC as they were much more helpful over the phone, PN couldn't have been less interested, this is the price to look at it, nothing else. Both are about the same distance from me. Doesn’t surprise me with project nine to be honest. I had a very bad experience with the owner back when he was spanner man at la rose. Some I talk to swear by him. Most swear at him. Quote Link to comment Share on other sites More sharing options...
McDonald Posted January 18, 2022 Report Share Posted January 18, 2022 1 hour ago, Paul P said: Doesn’t surprise me with project nine to be honest. I had a very bad experience with the owner back when he was spanner man at la rose. Some I talk to swear by him. Most swear at him. Spannering & charm is a winning combination. Some believe they are so outstanding as mechanics that they don't need to be personable. Quote Link to comment Share on other sites More sharing options...
iborguk Posted January 18, 2022 Report Share Posted January 18, 2022 (edited) . Edited January 18, 2022 by iborguk Quote Link to comment Share on other sites More sharing options...
Paul P Posted January 18, 2022 Report Share Posted January 18, 2022 11 minutes ago, McDonald said: Spannering & charm is a winning combination. Some believe they are so outstanding as mechanics that they don't need to be personable. True. except the spannering is questionable too “the reason your brakes failed completely after you spent more than a grand having them sorted is because you have new pads” and “the pedal goes to the floor because you don’t know how to drive” and don’t ask him to get his son to help get the car mot’Ed. That doesn’t have a history of ending well. Quote Link to comment Share on other sites More sharing options...
McDonald Posted January 18, 2022 Report Share Posted January 18, 2022 3 minutes ago, Paul P said: True. except the spannering is questionable too “the reason your brakes failed completely after you spent more than a grand having them sorted is because you have new pads”and “the pedal goes to the floor because you don’t know how to drive” and don’t ask him to get his son to help get the car mot’Ed. That doesn’t have a history of ending well. That business is unlikely to flourish in the medium to long term. Talentless grunt doesn't usually do well. 1 Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 21, 2022 Author Report Share Posted January 21, 2022 It's all gone slightly off topic! Anyway the chaps at MSC have diagnosed the fault as an o2 sensor on bank 1, the one behind the cat. So the next question is, how are are they to change, and has anyone got a link to the correct part, otherwise they want £280 to do the job. Thanks in advance. Quote Link to comment Share on other sites More sharing options...
½cwt Posted January 21, 2022 Report Share Posted January 21, 2022 Porsche part number is 986 606 126 01 (about £250 +VAT on D911) Bosch part number 0 258 003 806 (about £65 +VAT on D911). Go to your local Bosch auto electrics centre and you may get a few more pennies off that. Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 22, 2022 Author Report Share Posted January 22, 2022 Thanks, I will look thar up, MSC want £140 for the BOSCH one. Quote Link to comment Share on other sites More sharing options...
deanmr2 Posted January 23, 2022 Report Share Posted January 23, 2022 On 1/21/2022 at 11:08 PM, ½cwt said: Porsche part number is 986 606 126 01 (about £250 +VAT on D911) Bosch part number 0 258 003 806 (about £65 +VAT on D911). Go to your local Bosch auto electrics centre and you may get a few more pennies off that. I bought the Bosch one from D911 last week used discount code PCGB005 £80 delivered 1 Quote Link to comment Share on other sites More sharing options...
deanmr2 Posted January 23, 2022 Report Share Posted January 23, 2022 1 minute ago, deanmr2 said: I bought the Bosch one from D911 last week used discount code PCGB005 £80 delivered I fitted the o2 sensor myself used plenty of dismantling fluid and left to soak for a couple of days and the old one came out without much of a fight it’s an easy enough DIY job 1 Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 23, 2022 Author Report Share Posted January 23, 2022 Thanks for the code, just interested if anyone has used a different brand aftermarket sensor as they are cheaper, or is this a false economy? Quote Link to comment Share on other sites More sharing options...
Paul P Posted January 23, 2022 Report Share Posted January 23, 2022 So they reckon that a misfire/rough idle on a cold engine at startup is an o2 sensor ? i may well be wrong but I thought when the engine was cold the car operates in “open loop” mode and ignores the o2 sensors until things have at least started to warm up if it fixes it great but curious what they found to lead them to that conclusion. Did they give you any idea of stored codes or anything else their diags showed ? Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 23, 2022 Author Report Share Posted January 23, 2022 These were the only codes that were showing up, I can't remember what numbers they were. Quote Link to comment Share on other sites More sharing options...
BBB Posted January 23, 2022 Report Share Posted January 23, 2022 I'm with @Paul P on this one, cold start is open loop and ignores the lambda sensors until whatever parameters Porsche have decided on to trigger the switch over to closed loop (coolant temperature for example). Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 23, 2022 Author Report Share Posted January 23, 2022 OK, thanks for the information, from this I can assume they have only run a diagnostic, and not looked at anything physical on the car. I will call them tomorrow and confirm. Quote Link to comment Share on other sites More sharing options...
Meridianmet Posted January 24, 2022 Author Report Share Posted January 24, 2022 Just as an aside to this, if I replace the sensor myself, is there anything that I will need to reset on the car, error codes etc? Thanks. Quote Link to comment Share on other sites More sharing options...
Paul P Posted January 24, 2022 Report Share Posted January 24, 2022 If there are stored error codes then you should clear them before replacing the sensor otherwise you won’t know if What you have done has had any effect on them, but I would have thought the garage would have cleared any codes and if they don’t come back you are chasing ghosts. Is the cold start issue still there ? Quote Link to comment Share on other sites More sharing options...
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