300SL-24 Posted August 18, 2022 Report Share Posted August 18, 2022 I have been using my Boxster pretty much daily since my purchase a couple of months ago and it has run very well. Until today! So coming home from work on a dual carriageway I felt a lack of power and slight misfire, but no engine light on the dashboard. My daughter works for the NHS and I went to the local hospital to pick her up. On arrival I switched the engine off and waited about ten minutes for her, tried to start the engine and it would not start. It turns over fine, and I had it running without touching the throttle briefly, however when trying to touch the accelerator it died. It did this a few times and was "fluffy" on the pedal but would not catch and run. The AA guy arrived and plugged his laptop into the OBD port but it would not read any of the systems to diagnose. He suspected it was a fuel problem but only spent about five minutes before hooking me up and towing me home. I now have the car on my drive broken. I did call a Porsche specialist near me and they said I could have it towed to them on Monday but I have not used them, or any garage as yet. I am thinking maybe a coil pack but they were all replaced around 18 months ago 8000 miles. The AA man said he could not hear the fuel pump prime which made him believe it is a fuel issue. Any pointers where to go from here please? Quote Link to comment Share on other sites More sharing options...
Menoporsche Posted August 18, 2022 Report Share Posted August 18, 2022 One coil pack wouldn’t stop it starting. Those symptoms do point to a fuel feed problem. 1 Quote Link to comment Share on other sites More sharing options...
edc Posted August 18, 2022 Report Share Posted August 18, 2022 I had the fuel pump on mine go a few years back. Quote Link to comment Share on other sites More sharing options...
Andy Mac Posted August 18, 2022 Report Share Posted August 18, 2022 @300SL-24 might be of use - couple of diy diagnostics when my pump gave up the ghost… 1 Quote Link to comment Share on other sites More sharing options...
½cwt Posted August 18, 2022 Report Share Posted August 18, 2022 (edited) MAF? Basically a duff MAF is sending almost impossible date to the ECU/DME which causes it to set fuel/air conditions that the engine won't run in. When mine failed it was very lumpy running on anywhere between 3 and 5 cylinders at a time, detonation in the exhaust and had to be brutal with the throttle getting it running or pulling away and I was able to limp it home even with it dying a couple of times. It ran like the proverbial dog, but only just. If it is this, the easy test is to disconnect it and the car should run to a default basic engine map. The connection is in the top of the engine bay on the passenger side towards the rear. Also if you need on genuine is costly Bosch (OE supplier slightly costly, or second hand, my second hand one is still running fine after 3 years (£35 IIRC). Edited August 18, 2022 by ½cwt Quote Link to comment Share on other sites More sharing options...
TROOPER88 Posted August 18, 2022 Report Share Posted August 18, 2022 OP, I know you called me prior to purchase but I can not remember all the details. If you want me to have a look, just shout. Try and start it from cold In the morning and report back 1 Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 19, 2022 Author Report Share Posted August 19, 2022 Thanks for the replies much appreciated. So this morning it is just turning over but seems not to be firing. It will not even try to run like it did yesterday when hot. Quote Link to comment Share on other sites More sharing options...
TROOPER88 Posted August 19, 2022 Report Share Posted August 19, 2022 26 minutes ago, 300SL-24 said: Thanks for the replies much appreciated. So this morning it is just turning over but seems not to be firing. It will not even try to run like it did yesterday when hot. Could be any number of things in all honesty. Fuel pump relay, fuel pump, crank position sensor etc etc Best to get it to a specialist. Quote Link to comment Share on other sites More sharing options...
Bradders59 Posted August 19, 2022 Report Share Posted August 19, 2022 Which specialist in Essex did you contact ? Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 19, 2022 Author Report Share Posted August 19, 2022 23 minutes ago, Bradders59 said: Which specialist in Essex did you contact ? https://www.porschespecialistservices.co.uk/ This one, at first they said they could not see it until 17th Sept. They then rang back and said they could take it on Monday if I could get it over there. Quote Link to comment Share on other sites More sharing options...
iborguk Posted August 19, 2022 Report Share Posted August 19, 2022 (edited) No personal experience, others have been happy with the service from AutoStrasse, at Coggeshall https://autostrasse.co Edited August 19, 2022 by iborguk 1 Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 19, 2022 Author Report Share Posted August 19, 2022 I’m in Basildon so appreciate any recommendations for a good specialist nearby many thanks Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 19, 2022 Author Report Share Posted August 19, 2022 I will try and diagnose and sort the issue myself first. I was looking to buy a better code reader and was looking at the icarsoft pro has anyone got any recommendations Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 19, 2022 Author Report Share Posted August 19, 2022 This one https://ljmcardiagnostics.co.uk/products/icarsoft-cr-pro-full-system-multi-manufacturer-professional-diagnostic-scan-tool?variant=15176760819778¤cy=GBP&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gclid=EAIaIQobChMIoZOFvMfS-QIV4oBQBh0YfwN8EAQYASABEgJppfD_BwE Quote Link to comment Share on other sites More sharing options...
iborguk Posted August 19, 2022 Report Share Posted August 19, 2022 36 minutes ago, 300SL-24 said: This one https://ljmcardiagnostics.co.uk/products/icarsoft-cr-pro-full-system-multi-manufacturer-professional-diagnostic-scan-tool?variant=15176760819778¤cy=GBP&utm_medium=product_sync&utm_source=google&utm_content=sag_organic&utm_campaign=sag_organic&gclid=EAIaIQobChMIoZOFvMfS-QIV4oBQBh0YfwN8EAQYASABEgJppfD_BwE @Paul P Is that the one you bought ? Quote Link to comment Share on other sites More sharing options...
TROOPER88 Posted August 19, 2022 Report Share Posted August 19, 2022 With the nature of the OP's fault, I do not believe a handheld diagnostics reader will be any good at all unfortunately. OP: Inspect the fuel pump relay and try another known good one. If all good, bridge fuel pump to check if pumping 2 1 Quote Link to comment Share on other sites More sharing options...
Paul P Posted August 19, 2022 Report Share Posted August 19, 2022 12 minutes ago, iborguk said: @Paul P Is that the one you bought ? That's the one i have for the fleet - and it works well enough for reading faults - whilst it covers Porsche - i don't think it has many "activation" capabilities - so you couldn't tell it to spin up the fuel pump or whatever like you can with PIWIS Also - that one is known to not be able to clear AIRBAG codes on a 9x6 - unlike the Foxwell BT530 - but as above not sure how useful it would be in testing individual components. 2 Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 19, 2022 Author Report Share Posted August 19, 2022 58 minutes ago, TROOPER88 said: With the nature of the OP's fault, I do not believe a handheld diagnostics reader will be any good at all unfortunately. OP: Inspect the fuel pump relay and try another known good one. If all good, bridge fuel pump to check if pumping Thanks will do that first Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 19, 2022 Author Report Share Posted August 19, 2022 12 hours ago, TROOPER88 said: OP, I know you called me prior to purchase but I can not remember all the details. If you want me to have a look, just shout. Try and start it from cold In the morning and report back Thanks Paul, once I get it going again I will come and see you Quote Link to comment Share on other sites More sharing options...
Stu67 Posted August 19, 2022 Report Share Posted August 19, 2022 A quick and easy check of the fuel pump relay/pump - When turning the ignition on (Not trying to start the engine thou) can you hear the whine of an electric motor for a couple seconds, If nothing at all, the pump is not priming the fuel system and hence no go. 1 Quote Link to comment Share on other sites More sharing options...
Bradders59 Posted August 19, 2022 Report Share Posted August 19, 2022 4 hours ago, iborguk said: No personal experience, others have been happy with the service from AutoStrasse, at Coggeshall https://autostrasse.co Same here. Ive heard good reports about Autostrasse Coggeshall (who are 10 minutes away from me) including my brother in law who took his ex Topbox 987.2 there about a week ago. Very pleased with their work and said prices were also very reasonable. I have no knowledge of the one the OP has linked to unfortunately. 1 Quote Link to comment Share on other sites More sharing options...
999mch Posted August 19, 2022 Report Share Posted August 19, 2022 I used them earlier in the year for a full service and they were absolutely fine and quite reasonable on price Quote Link to comment Share on other sites More sharing options...
jonogt6 Posted August 19, 2022 Report Share Posted August 19, 2022 My MAF failing went from car running perfectly to not running at all when i tried to start it the next day. Try disconnecting it and see what happens. Mine started instantly one it was disconnected and proved the MAF was defective. 1 1 Quote Link to comment Share on other sites More sharing options...
jonogt6 Posted August 19, 2022 Report Share Posted August 19, 2022 19 hours ago, ½cwt said: MAF? Basically a duff MAF is sending almost impossible date to the ECU/DME which causes it to set fuel/air conditions that the engine won't run in. When mine failed it was very lumpy running on anywhere between 3 and 5 cylinders at a time, detonation in the exhaust and had to be brutal with the throttle getting it running or pulling away and I was able to limp it home even with it dying a couple of times. It ran like the proverbial dog, but only just. If it is this, the easy test is to disconnect it and the car should run to a default basic engine map. The connection is in the top of the engine bay on the passenger side towards the rear. Also if you need on genuine is costly Bosch (OE supplier slightly costly, or second hand, my second hand one is still running fine after 3 years (£35 IIRC). Agreed sound just like mine, but mine wouldn't run at all. 1 Quote Link to comment Share on other sites More sharing options...
300SL-24 Posted August 20, 2022 Author Report Share Posted August 20, 2022 Update: I had time to look at this today. Made a jumper lead for the fuel pump relay and had a read up in the net. The car has not been started since Thursday but has been on a Ctek to ensure the battery is at full power. I turned the key and could hear the fuel pump prime, and it started straight away. I left it running for about 10 minutes and it ran fine, so I switched it off. My thoughts were fuel pump relay intermittent possibly. I did a few little jobs, cleared the rear drains etc. About an hour later no start! So I removed the fuel pump relay and used the small jumper lead I made, quietly confident this would cause the pump to run. Not the case, even with the jump lead connected the fuel pump would not run. I pulled the fuse and it was fine, so that is where I am at. I have taken on board the comments regarding the MAF, however with no fuel pump priming I would think the issue must be related to this rather than the MAF. So now where do I go, I would assume that somehow I need to check power at the pump as in the link kindly put up by @Andy Mac but suspect that there will be no power there. Should I connect a 12v supply to the pump directly and see if it runs, if so I need to look at something in the line before the pump. Maybe it is an earthing issue? Thanks for any forthcoming help and advice Regards Ray Quote Link to comment Share on other sites More sharing options...
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