The Caped Crusader Posted July 30, 2023 Report Share Posted July 30, 2023 22 hours ago, Rav said: Thanks for the continued support friends. I took the care to LAP911 in Highworth. Luke checked over the car. He heard the harmonica sound. He suggested a new fuel filter and fuel pump, but also advised that it might be a small valve at the bottom of the filler neck. £350 inc vat to fix. I might just live with it. The oil leak was a quick fix, some tensioner washer. While there, I was also told that I need new brake discs and pads, Spark plug tubes, brake lines, Front suspension springs and shocks. I plan to get these done over the autumn. That sounds like a bit of a guess to me. Did he check the fuel line pressures via diagnostics tool at all? Quote Link to comment Share on other sites More sharing options...
Rav Posted August 7, 2023 Author Report Share Posted August 7, 2023 I dont think so, no.... Quote Link to comment Share on other sites More sharing options...
Photogirl Posted September 8, 2023 Report Share Posted September 8, 2023 On 6/11/2023 at 12:06 PM, edc said: That's what I've posted earlier. Hot start issue can be any number of things. With mine it was the purge valve solenoid. Several indis were barking up the wrong tree (at great cost to myself) then luckily I met the right technician and got it sorted. Quote Link to comment Share on other sites More sharing options...
Rav Posted September 9, 2023 Author Report Share Posted September 9, 2023 (edited) Thanks Guys. I used the car on Thursday and boy was it a hot day. I had to go to a conference called CENEX at Millbrook and was enjoying the drive home, yes it was M1, M25 and M4, but hey ho. Roof down time!! I noted that the performance of the car was worsening as i got closer to home. Luckily when on my road, the car started to act odd, hesitation etc. I noted a whine from the fuel filler cap again. You tube video of it here (i laboured the point a bit), but you can hear the sound which is now continuous and also the rough idle and near stalling when the fuel cap was removed and applied. I'm starting to tire of this, plus the car has a cracked front spring and needs shocks on the front. Big bills are looming and my Alpina is also needing rot repair. I am toying with selling up. Any ideas what the noise is? Edited September 9, 2023 by Rav Quote Link to comment Share on other sites More sharing options...
Crudeoink Posted September 9, 2023 Report Share Posted September 9, 2023 Is the tank breather blocked and creating a vacuum in the tank ? Would explain the noise at the filler and loss of power Quote Link to comment Share on other sites More sharing options...
Amaboknaai Posted September 9, 2023 Report Share Posted September 9, 2023 Any smoke from exhaust? Sounds like it could be AOS. Quote Link to comment Share on other sites More sharing options...
Amaboknaai Posted September 9, 2023 Report Share Posted September 9, 2023 Any smoke from exhaust? Sounds like it could be AOS. Quote Link to comment Share on other sites More sharing options...
Amaboknaai Posted September 9, 2023 Report Share Posted September 9, 2023 Any smoke from exhaust? Sounds like it could be AOS. Quote Link to comment Share on other sites More sharing options...
Boxob Posted September 9, 2023 Report Share Posted September 9, 2023 How odd. What would happen if you put cling film over the fuel filler hole (without cap fitted)? Is it sucked inwards, blown outwards or neither? If there's no suck or blow then it's not the cap itself but the cap seems to be somehow amplifying noise from elsewhere. Is there any vibration around the filler cap/tank? Not sure if it'll work but you could try a dowel pressed to the cap and then the pertrol tank without the cap to 'feel' the vibration, like testing a bearing. Due to an issue with my car I have been looking at AOS failure. They do create smoke but before it becomes really obvious, when they're just beginning to fail, a symptom can be rough running and poor starting. Is the oil filler cap sucking when you remove it on your car? Quote Link to comment Share on other sites More sharing options...
Rav Posted September 10, 2023 Author Report Share Posted September 10, 2023 Thanks guys. I will try this again. My Porsche specialist has suggested a new fuel pump and fuel filter as a point to start. The cap is not sucked on when i remove it, so i think it must be being blown outwards, hence the accordion noise. I will ask about the AOS separator. Quote Link to comment Share on other sites More sharing options...
Boxob Posted September 10, 2023 Report Share Posted September 10, 2023 2 hours ago, Rav said: The cap is not sucked on when i remove it, so i think it must be being blown outwards, hence the accordion noise. The cling film telltale should prove for sure. It would be unusual for a petrol tank to become pressurised as it means something is inflating it! And quite a bit if its playing a tune! Quote Link to comment Share on other sites More sharing options...
Boxob Posted September 10, 2023 Report Share Posted September 10, 2023 13 minutes ago, Boxob said: The cling film telltale should prove for sure. It would be unusual for a petrol tank to become so pressurised it is playing a tune! It means something is inflating it excessively or its failing to vent. Corrected above. 1 Quote Link to comment Share on other sites More sharing options...
Rav Posted September 10, 2023 Author Report Share Posted September 10, 2023 Trying this now, but my neighbour is watching me put cling film on my car 🙂 Quote Link to comment Share on other sites More sharing options...
Rav Posted September 10, 2023 Author Report Share Posted September 10, 2023 Ok, so some cursory tests have been run. On idle the cling film bulged outwards, making sense as this would cause pressurised air to escape via the fuel filler cap making the noise in my last video. However, revving the car (sorry neighbours) sucks the cling film back in again. This makes sense as the car is fine, if you use it - like my journey on the motorways, but at more gentle speed like on my road, it didn't like it. Videos here: Any ideas? Quote Link to comment Share on other sites More sharing options...
Boxob Posted September 10, 2023 Report Share Posted September 10, 2023 I was expecting something more dramatic! That doesn't seem enough suck or blow to bypass the seal on the petrol cap and make a noise - if that is indeed the problem. Was there a good seal between the cling film and filler tube? Can anyone duplicate the test to see if that's normal (I would but my car has a suspected AOS issue)? Quote Link to comment Share on other sites More sharing options...
Rav Posted September 10, 2023 Author Report Share Posted September 10, 2023 15 minutes ago, Boxob said: I was expecting something more dramatic! That doesn't seem enough suck or blow to bypass the seal on the petrol cap and make a noise - if that is indeed the problem. Was there a good seal between the cling film and filler tube? Can anyone duplicate the test to see if that's normal (I would but my car has a suspected AOS issue)? I did the best job i could on the seal, but it was not perfect. Quote Link to comment Share on other sites More sharing options...
Boxob Posted September 10, 2023 Report Share Posted September 10, 2023 Another thought/test. Fuel filler caps are generally universal. You could try a filler cap from another car and see if that makes a noise. Quote Link to comment Share on other sites More sharing options...
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