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mchung
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Yeah, I guess it's really how many in a certain period. It also looks like the DME holds on to a value for a few seconds and then resets the count again, so that can have the effect of overreporting the totals if I just add up the numbers. The numbers get up to a maximum of 4 before they reset back to zero. When I run the logs through Excel and simply add up the numbers, I get a total of 1000+ total events over an 18 minute driving period, the highest cylinder being up to 236, the lowest being 51. I've only owned the vehicle since October and I don't know the past history. I'll probably pop under the hood to check the coil part numbers. Cheers, Martin
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That sort of behaviour is what happens to me with my 06 CS. Just when you want to accelerate smoothly, it judders a little bit like it's lugging. Not horrible bucking and jerking, but just some unsmoothness. Downshift and it's fine (of course). Most passengers don't notice it, but I do (and so do some car buff passengers). Idle is generally OK, but not as smooth as I would expect. As I mentioned in my other post, the Durametric tool shows some misfiring. I'm pretty convinced it's a bad coil (or more). I told the dealer that the best way to see this happen is to get the tranny into M6 (just around 55km/h I think) and try to accelerate. The dealership said that Porsche does not recommend running it that way and this is normal. I have about a month left of warranty so I would like to get it taken care of soon. I'm collecting evidence so I don't have to waste my time at the dealership again -- I'll present the TSBs, Durametric logs, etc. Now, if my knowledge isn't off, that low RPM area should be where the vehicle operates closed-loop lambda, so some cycling of the engine may occur under steady cruise conditions as it adjusts the fueling. That may be what the dealership is trying to tell you. But it shouldn't be creating such a noticeable drivability problem especially when accelerating. Martin
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Hi all, My '06 CS has some slight roughness when accelerating at low revs ~1500 RPM (dealer says I shouldn't be running the engine that low, but if the automatic tranny allows me to drive at those revs and gear combination....). Should a properly running CS be smooth? There's no CEL being raised and all codes are clear. However, the Durametric software is showing Misfire Counters values of 0 and 1 and sometimes up to 4 on all cylinders when I look at the Motronic Actual Values while the engine is running (some cylinders are worse than others). Most of the time they appear to be 0. What I wanted to know before I approached the dealer was whether a properly functioning engine will occasionally detect misfires anyway as part of normal operation. If not, then I think I have a better case for them to diagnose what I think is the infamous coil issue. Thanks for the help and other thoughts! Martin