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Hello, I'm new on this forum and stumbled upon a new problem (or old) with my 2.5l 986 Boxster from 1997. The problem occurs when the engine is started dead cold after sitting a few hours/overnight. Engine starts immediately but the RPMs start to surge / hunt between 1100 and 700 RPM. This continues for about 10 seconds after which the idle smoothes out to the normal cold idle RPM. The first pull away requires a tad more throttle then normal to prevent stalling. After this first pull, everything is almost normal and engine performance becomes better and better. When the engine is hot, the idle sits at 780 RPM with a minor fluctuation now and then (seems to be more than normal) I've been to two shops (official Porsche dealer and local Porsche specialist). Porsche dealer couldn't find anything and the specialist found the camshaft sensor on the left bank to be unplugged - but now comes the strange thing - the cabling is nowhere to be found!!!!!!? Took the car home to check myself but didn't find anything. No camshaft related codes to be found in the diagnosis and no CEL either. Attached one pic showing the sensor and it's missing plug Could someone help me out? - Is it possible for the engine not to throw a CEL when sensor is disconnected? - where is the sensor wire to be found?
A friend and I have been struggling with a strange problem with his 2006 997 4S with tiptronic transmission. When you start his car you need to turn the key and let it crank on the starter motor for around 10 seconds before it will start, and when it does it seems to be a bit lumpy for the first second or two. However, if you shut it down while it is running and restart it right away it fires straight up within a second. We have pulled off a coil pack and put a new plug into it (earthed out with a jump lead) and observed that while it is cranking there is no spark, apart from maybe one every 3 seconds, and then rapid sparking at the plug as soon as it fires up. We have also hooked up fuel pressure monitoring kit to the car, and the fuel pressure seems to be right, as I thought it may be the fuel pump check valve or pressure regulator bleeding off pressure, but then we discovered what was happening with the spark not being there until 10 or so seconds of continuous cranking. We have hooked the car up to the PIWIS and PIWIS-2 that the local Porsche approved bodyshop loaned to us, and there are no fault codes anywhere. We also had hoped to watch the live data while cranking, but it seems that communication disconnects during starter motor cranking, which we are told is normal. The strange thing is that the car idles fine, runs fine, no hesitation, we have followed the Porsche test plan for checking the mass airflow sensor, we have used a smoke machine on the intake to look for vacuum leaks, we have even checked the various temperature sensors on the PIWIS and all seem to be reporting good temperatures. While we had the PIWIS-2 we even reprogrammed the DME with the latest software, which it said was already loaded but we did it anyway in case something was corrupted. We have even disconnected the battery over night and tried the various re-training adapting methods on the internet. Fuel trims are all hovering around 900 and 1.1 We have even changed the crank sensor for a new one and no difference. If it were not for the loss of spark, I would be tempted to say it was the fuel pressure bleeding off, because it is a little like it is trying to get fuel back up to the injectors when cranking, which would also explain the way it only has this problem 5 mins after shutting the engine down, but not less than 5 mins. Does the 997 DME monitor oil pressure before it supplies a spark? My reason for asking is that this would also be something which would match up with the symptoms, once the oil pressure has bled off completely, it would take a few cranks to regain it, especially if the oil circuit had a fault... But when running the oil pressure is good, however it does seem to be that the oil pressure is at the bottom on the instruments when cranking and either it shoots up and then the engine runs, or maybe it just shoots up due to the engine running at a faster speed than starter motor cranking. We even worried it may be cranking a little slower than the DME was happy with, so even replaced the dreaded alternator/starter motor/charging harness on the engine.. Which now has it cranking a fraction faster, but still the same problem. Having compared the cranking speed to my Boxster and 996, it seems to be turning over at the same kind of speed. Any ideas anyone??
Hi guys. My car wont crank and i dont know why. On the start lock relay there is no permission signal from the ECU. Directly starter will cranks and engine work. I have fault code on bracke switch, but brake light work. And driver seat airbag. Please help. Sory for my English. Thanks, Kirill
Hello Ladies and Gentlemen I just bought a 99 Boxster with 82,000 miles on it (Manual) Sometimes after I have been out driving I park my car and when I get back in it it will not crank. I do hear the solenoid at the starter kick when I turn the key but no luck. The engine will not turn. Then the next several hours I go and turn the key and "Holy Moley" it starts right up and will continue to start for several days then it will just die again. So far have changed battery and starter and checked all ground and positive wires and all good . HELP ME PLEASE!
Hello, Heavy rain got into interior, shorted ecm disabeling unit, i think i need to replace. I am about 70 miles from dealer, car wont start, tried to get replacement unit but learned that i needed the car to be at dealer to program any suggestions on how to install replacement and avoid dealer or overdide or repaie existing unit ? Thanks Chris
Hello all new to this site but finding it really helpful, wondering if someone can help, i own an 06 4S cab with 52k miles, at start up sometimes get a very annoying loud screeching sound, its only at start up, never on acceleration, just had coils, plugs and belts all changed, 3 days after it left the shop it started happening again. Any ideas?