Gramps Posted February 14, 2023 Report Share Posted February 14, 2023 Hi All. Further to my recent post of a couple of MoT advisories I also had the added bonus of the engine management light popping up as I started the car to drive it out of the MoT place. Apparently it would've failed the MoT if it had come up during the test, so something to be grateful for. Ist time I'd seen the engine management light. The guy took the car (Boxster S 987.2) to the side and stuck their kit on it. It showed fault codes P0171 and P0174 which would appear to refer to a mixture too lean issue on both banks. They said it did show a misfire at one point. I also now get an occasional rough idle but still drives well. When cold it does seem to turn over for longer than I'd expect and once it fires up it can be very lumpy, even cut out, before running nice and smooth. So question is has anyone experienced the same? Do I need plugs and coil packs (plugs were changed 3 yrs ago and have covered 12k). If so any recommendations on where and which to go for? TIA... Garamps (AKA Rob) Quote Link to comment Share on other sites More sharing options...
Guest Posted February 14, 2023 Report Share Posted February 14, 2023 I'd recommend giving the maf a good clean, be careful though they're fragile but can be done. Quote Link to comment Share on other sites More sharing options...
Paul P Posted February 14, 2023 Report Share Posted February 14, 2023 Those are generic/universal codes and do indeed point to "too lean" which sounds like either MAF as suggested ( can rule it out by unplugging it) - or an air leak - anything been done recently ( AOS? Airfilter? ) that could have a pipe thats split or not properly re-attached etc. ? I wouldn't have expected plugs or coils to cause that, I think more likely that lazy starting and lumpy when cold is a symptom of this - I would chase the source of the lean running before firing the parts gun at the plugs/coils ( coils might be a problem of course but until the other bit is sorted then you won't know for sure if its one problem or two you are chasing) 1 Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 14, 2023 Author Report Share Posted February 14, 2023 41 minutes ago, Paul P said: Those are generic/universal codes and do indeed point to "too lean" which sounds like either MAF as suggested ( can rule it out by unplugging it) - or an air leak - anything been done recently ( AOS? Airfilter? ) that could have a pipe thats split or not properly re-attached etc. ? I wouldn't have expected plugs or coils to cause that, I think more likely that lazy starting and lumpy when cold is a symptom of this - I would chase the source of the lean running before firing the parts gun at the plugs/coils ( coils might be a problem of course but until the other bit is sorted then you won't know for sure if its one problem or two you are chasing) Cheers Paul. Nothing done of late. The error is intermittent. They cleared it at the garage but it came on again the following day. I've got an icarsoft por v2.0 and reset to see what else came up and today I had P1094, which also seems to indicate the MAF (wherever that is, more googling required). Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 14, 2023 Author Report Share Posted February 14, 2023 3 hours ago, skoosh1970 said: I'd recommend giving the maf a good clean, be careful though they're fragile but can be done. Thanks for the info @skoosh1970. The error is intermittent. They cleared it at the garage but it came on again the following day. I've got an icarsoft por v2.0 and reset to see what else came up and today I had P1094, which also seems to indicate the MAF (wherever that is, more googling required). So you could indeed be on the right track 👍 Quote Link to comment Share on other sites More sharing options...
sa utah Posted February 14, 2023 Report Share Posted February 14, 2023 you'll likely find your torx bits etc won't fit the MAF fixings. You'll need to order a set of the correct ones from Amazon etc. I forget what they are called. Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 14, 2023 Author Report Share Posted February 14, 2023 2 minutes ago, sa utah said: you'll likely find your torx bits etc won't fit the MAF fixings. You'll need to order a set of the correct ones from Amazon etc. I forget what they are called. Cheers @sa utah. Been having a google, You tube vids etc and have seen they can use security Torx (Torx with a raised pin in the middle). I do have some of them. Will have a dabble tomorrow in daylight 👍 Quote Link to comment Share on other sites More sharing options...
Guest Posted February 14, 2023 Report Share Posted February 14, 2023 Hope you get it sorted, the maf is the whole housing by the way. Is your car desnorked by the way ? Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 14, 2023 Author Report Share Posted February 14, 2023 3 minutes ago, skoosh1970 said: Hope you get it sorted, the maf is the whole housing by the way. Is your car desnorked by the way ? It is, will that affect anything? Couldn't say I noticed any difference. I've ordered some Liqui Moly 4066 Air Flow Sensor Cleaner, due to arrive Thursday. From what I've seen oiled performance filters such as K&N (I have a BMC), can caused MAF issues, as I presume that over time the oils will transfer from the filter to the MAF. When I bought my car the BMC filter was filthy, did post some pics on here at the time, was going to replace but cleaned. So maybe a combination of the filter having got so clogged, then the clean and re-oil could have ganged up on the MAF. Will hopefully find out Thursday 🙂 Quote Link to comment Share on other sites More sharing options...
Guest Posted February 15, 2023 Report Share Posted February 15, 2023 My maf was filthy and my mechanic attributed some of it due to the desnork. Car ran lumpy at times and experience told me it was maf. After being cleaned she runs like a dream. Alot of folks will advise to replace the whole unit as they can't be cleaned in isolation but they can. Replacement items are pretty expensive if memory serves. Quote Link to comment Share on other sites More sharing options...
sa utah Posted February 15, 2023 Report Share Posted February 15, 2023 (edited) 19 hours ago, Gramps said: Cheers @sa utah. Been having a google, You tube vids etc and have seen they can use security Torx (Torx with a raised pin in the middle). I do have some of them. Will have a dabble tomorrow in daylight 👍 They actually have more "sides" than a normal torx / Allen bit............So not just the security type... Pentalobe?? I can't remember exactly. Edited February 15, 2023 by sa utah 1 Quote Link to comment Share on other sites More sharing options...
BBB Posted February 15, 2023 Report Share Posted February 15, 2023 23 minutes ago, sa utah said: They actually have more "sides" than a normal torx / Allen bit............So not just the security type... Pentalobe?? I can't remember exactly. They're called "triple square" bits and have 12 sides. https://www.amazon.co.uk/Triple-Square-Spline-Screwdriver-Metric/dp/B0823KBJGM 1 Quote Link to comment Share on other sites More sharing options...
½cwt Posted February 15, 2023 Report Share Posted February 15, 2023 41 minutes ago, BBB said: They're called "triple square" bits and have 12 sides. https://www.amazon.co.uk/Triple-Square-Spline-Screwdriver-Metric/dp/B0823KBJGM Not on the MAF, the dome head bolt is a conventional 6 point Torx but with a pin in the centre. A number of multiple tip Torx kits actually have the hollow tip bit if you check. 1 Quote Link to comment Share on other sites More sharing options...
BBB Posted February 15, 2023 Report Share Posted February 15, 2023 31 minutes ago, ½cwt said: Not on the MAF, the dome head bolt is a conventional 6 point Torx but with a pin in the centre. A number of multiple tip Torx kits actually have the hollow tip bit if you check. I've no idea! I was responding to @sa utah saying it had more sides than a normal Torx, which is then often triple square bits. 1 Quote Link to comment Share on other sites More sharing options...
sa utah Posted February 15, 2023 Report Share Posted February 15, 2023 (edited) 43 minutes ago, ½cwt said: Not on the MAF, the dome head bolt is a conventional 6 point Torx but with a pin in the centre. A number of multiple tip Torx kits actually have the hollow tip bit if you check. Well I can tell you on my 2006 2.7 Boxster and the Cayman I tinker with they were both "Pentalobe" bits. Not normal security TORX. I had any number of TORX bits including security types and nothing fitted. I had to order a set of Pentalobe ones from Amazon. Never used them since ! Edited February 15, 2023 by sa utah 1 Quote Link to comment Share on other sites More sharing options...
Liberty Posted February 15, 2023 Report Share Posted February 15, 2023 Small hacksaw to cut a slot in the head.unscew and replace with something else.Yes I'm a bodge artist 😘 worked for me and definitely worth cleaning. 1 Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 15, 2023 Author Report Share Posted February 15, 2023 7 hours ago, sa utah said: They actually have more "sides" than a normal torx / Allen bit............So not just the security type... Pentalobe?? I can't remember exactly. Ah. I was making the most of the weather today so after giving the roof a clean I took it out for a quick squirt, very enjoyable it was too. Just love that falt 6 with PSE and sports cats/manifolds. Will have a look tomorrow if the weather holds, and google the bits in the meantime. Thanks for the heads up Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 15, 2023 Author Report Share Posted February 15, 2023 6 hours ago, ½cwt said: Not on the MAF, the dome head bolt is a conventional 6 point Torx but with a pin in the centre. A number of multiple tip Torx kits actually have the hollow tip bit if you check. Now those I have 👍 Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 15, 2023 Author Report Share Posted February 15, 2023 5 hours ago, sa utah said: Well I can tell you on my 2006 2.7 Boxster and the Cayman I tinker with they were both "Pentalobe" bits. Not normal security TORX. I had any number of TORX bits including security types and nothing fitted. I had to order a set of Pentalobe ones from Amazon. Never used them since ! I'll find out tomorrow and put a post up 👍 Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 15, 2023 Author Report Share Posted February 15, 2023 6 hours ago, BBB said: They're called "triple square" bits and have 12 sides. https://www.amazon.co.uk/Triple-Square-Spline-Screwdriver-Metric/dp/B0823KBJGM Blimey not cheap for those are they?? Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 15, 2023 Author Report Share Posted February 15, 2023 5 hours ago, sa utah said: Well I can tell you on my 2006 2.7 Boxster and the Cayman I tinker with they were both "Pentalobe" bits. Not normal security TORX. I had any number of TORX bits including security types and nothing fitted. I had to order a set of Pentalobe ones from Amazon. Never used them since ! Checked my little Alladins cave (box) of bits and lo and behold I have an M5 M6 and M8 in there, bottom left corner. So what's the odds it's smaller than M5 Quote Link to comment Share on other sites More sharing options...
½cwt Posted February 16, 2023 Report Share Posted February 16, 2023 Something in that box of tricks should do it. I'd be looking at the third row, T20 maybe. 1 Quote Link to comment Share on other sites More sharing options...
Gramps Posted February 16, 2023 Author Report Share Posted February 16, 2023 3 hours ago, ½cwt said: Something in that box of tricks should do it. I'd be looking at the third row, T20 maybe. It's one of those sets you see and think I'm bound to need one of those, whatever they are, at some time, and so it's proven so far. The cleaner should be turning up this afternoon but constant light drizzle all day so far today. Hopefully it will clear fo a short while this afternoon. Quote Link to comment Share on other sites More sharing options...
BBB Posted February 16, 2023 Report Share Posted February 16, 2023 Who knew there were so many types! 1 1 Quote Link to comment Share on other sites More sharing options...
sa utah Posted February 16, 2023 Report Share Posted February 16, 2023 5 hours ago, ½cwt said: Something in that box of tricks should do it. I'd be looking at the third row, T20 maybe. You can certainly look at it but it won't fit. Not if the OPs part is that same as my 2 cars Quote Link to comment Share on other sites More sharing options...
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