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@Morissey I can second Ahsai's recommendation. He is correct... get the Durametric (less than $300 or 2 hrs at the local P-dealer). It will pay for itself in saving you time and money. I purchased one and he has been helping trace the source of the same misfire codes. By measuring actual values, we have eliminated cam deviation, MAF and are now I am going to make a smoke machine out of an old fog machine we used to use for Halloween (and an Ahsai post on another board). In my case, the codes are intermittent amongst the cylinders across both banks but they only happen on a cold start, at idle and when starting off in first gear with low revs... as I pull away, the RPMS drop for a second as I pass 2k and then come right back up and the engine pulls hard and smoothly throughout the rev range otherwise. You can check out my thread here: The thread title doesn't really match the topic as it was started while I was still looking to determine what the codes would be. I strongly recommend getting the cable and downloading the software. BTW, I am a 30-year mac user and have been running the program on Bootcamp without any trouble at all. I'll be following your thread to see if one of us uncovers a cause that might help the other. Good luck.
@Ahsai Thank you... I did the e-gas recalibration and am still getting a slight roughness in the cold start and a very slight hesitation when pulling away in first from a stop... the rpm drop for 1/2 a second as I pass 2k and then comes back and pulls hard and smooth. While researching smoke machines, I found your hack of a fog machine into a smoke machine—Brilliant! I have one and am planning on testing for vacuum leaks this weekend. Still determined to make as many maintenance and repairs on my 996 as I can. I keep telling myself that is part of the pride and joy or ownership. Understanding and repairing things is becoming a lost art in the world today. I like the idea that we can still fix most of what needs fixing... with the support of communities and resources like your posts. Thank you again for all your help thus far. I noticed another post where someone has gotten the same codes but I don't think that they have gotten into the different data points as you have guided me. I'm going to share this thread there and maybe they can benefit from some of your advice as well.
Hello... so I'm a victim of marketing. Ironic. My 996 AE is definitely E-Gas as shown above. I'll try the e-gas recalibration as noted above. below. These include the oil temp and ambient temp as requested... you'll see the misfires counting then going away when the throttle drops down to idle. Could this be the purge valve sticking (part no 83-08019561) or would that have shown up in the durametric testing? Going to try and find a vacuum leak with a home made smoke machine this weekend. Let me know if the actual values with the temps show anything new that I should run down. Thank you again for everyone input. Archive.zip
Hello again. I'm not with the car... and haven't actually seen the cable for the throttle linkage. I'm only going on what I've read but clearly there are different sources. http://press.porsche.com/archive/products/press_kits/press_kits_2004/PDF/new/1-11_Carrera_Release.pdf Read the first sentence on page 2 of this Porsche Official Press Release.... "This engine is equipped with a direct accelerator pedal linkage that provides spontaneous response and the anniversary car also has a mechanical rear-axle differential that enhances traction and acceleration potential. Together, these changes make the 40th Anniversary 911 one second faster in the acceleration run from a standing start to 120 mph (200 km/h), a feat the car accomplishes in 16.5 seconds." When I get home later, I will try looking for a cable and see it is visible to photograph.
Hello guys. "AE" is my abbreviation for Anniversary Edition. Unlike all the other 996.2's that have e-gas, the AE has a cable throttle. I think it was a nod to the past throttle feel. Appreciate everyone weighing on on the thread.
Thanks Ahsai. This model (AE) has a cable throttle so no e-gas present. I am going to try another test with the engine cold in about 2hrs. I just cross posted this on Pelican as well. I've been a long time member there and thought that we might get lucky with some sharing. Will post the updated reports here as soon as I have them. Thank you,
Attached to this message is the archive of this weekends Fault Code PDF files. Thank you again. FaultCodes_Reports_Archive.zip
I don't have the equipment for fuel pressure test or the intake air test. I have noticed that the CEL comes on more quickly as I have been driving again more... I did a three hour drive on Saturday and did a cold start, warm start actuals test. I also am including the most recent faults codes report as it is consistent that the cylinders that are recording the misfires are nearly all of them but are intermittent. @Ahsai can I ask you to look at these reports counting the misfires at cold start and warm start and let me know if these give any additional insights? Thank you! Actuals_Reports_Archive.zip
Yes, the MAF part is Bosch 98660612501
Attached here are two Fault Code tests that I ran 1 week ago and this morning before I ran the test above. Note that the misfires are spread across the cylinders and are not always consistent in my codes but I have been throwing these misfire codes for months now and while the car drives strong and pulls hard, I am concerned that I am damaging the motor. Thanks for your shared wisdom and experiences in advance. fault codes071417.pdf Short test 996 070717.pdf
I'm back... cleaned the MAF (appeared clean) and Throttle Body (only slightly dirty)... and checked the intake boots as best I could,,, no apparent cracks or loose fittings. The part number on the BOSCH MAF is 986 606 125 01 Ran through 1.5 tanks of gas with 3 cans of Seafoam. Running clean gas now... CEL came back within a couple of days... Attached the codes report here along with a set of actuals with a hot-start. I will post a cold start based on this text in a few hours. Not sure what to do next besides give-up and bring it to my local independent shop. Was hoping I could trace this and correct it without paying out. Let me know if you have any other suggestions. Thank you! 2017_07_14_996AE 114K Misfire test hot start.xls
Hi Ahsai. I just put in the seaform. I will take a look at the MAF a bit later and confirm the part number as well as clean it... should be late tonight. I will also clean the throttle body and then report back as soon as I have burned through the tank of gas. Thank you.
That is good news. I'll look for the Variocam timing areas and lift solenoids for any leakage. The gas is less than a week old. The car has been throwing these random misfire codes since I purchased it I think. The coils were so old and cracked that I was confident that they were the source so the continued misfires are a frustration. The plugs/coils I purchased from ECS... the coils: BERU, Mfg Part # 99760210402KT1KT ECS Part # ES#3083524 https://www.ecstuning.com/b-beru-parts/ignition-coil-update-kit/99760210402kt1kt/ the plugs: BOSCH, Mfg Part # 99917022390KT1 ECS Part # ES#2718140 https://www.ecstuning.com/b-bosch-parts/spark-plugs-set-of-6/99917022390kt1/ This spring I also replaced the stock air filter with HENGST brand from GermanAutoParts.com but the order doesn't show a part number. Some people have recommended cleaning the MAF but from that data, nothing indicates it needs that, right? I don't want to do anything to the sensitive (and costly) MAF element unless there is some indication it needs attention. Seafoam and run through a tank of gas will also start tonight... the neighbors will love me for the smoke-screen. haha. Will report back ASAP on results. Thx again.
@Ahsai I must thank you for your time and expertise here. I had some trouble getting good data on a cold engine (getting used to the software and Windows OS as a lifelong Mac User) but attached is a test that I think gets you what you were looking for... it is a cold start and that includes some drive time. The data reports always max out at 1000 rows so that seems to be a hard stop I don't know how to get more data. I also did a visual inspection of the intake boots and the oil filler tube and I do not see any issues with them... When I remove the oil fill cap there is a change in the engine idle but not so much suction that the cap is difficult to remove. I understand this can be related to the Air/Oil separator but I don't get the white smoke or any type of fuel small from the exhaust. The only other item that I noted should be updated (from my visual inspection and limited knowledge is the radiator cap is not the most recent part number ending in 04 that I think is the one that properly vents the cooling system w/o seepage (which I occasionally) show but I suspect this has no connection the the misfire codes. In addition to the data log of actuals, I am including the report from the quick test so you can see all the error codes. In addition to the Misfire codes, I have a re-occuring fault in the the alarm and the AC with a flapper motor. Again, these seem like they would not have any connection to the misfires. Last question for this post: The CEL came on yesterday... I get the idea that it comes on when there is a certain total number of misfires. The last time this happened, the CEL went away on it's own... the car sat for 3-4 days while I was traveling. This is my daily driver and am I running any risk of doing damage to the car by driving it while I try to trace down the cause of the misfires? Appreciate your advice. Thank you, 996 62417 quick test results.pdf Innov8_996AE_test 4 Misfires.xlsx
OK. Got it. I will re-do the test and send you the file... most likely by tomorrow morning. Thank you for your generosity of time and know-how.