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Showing results for tags 'missfire'.
Hi guys! this is my first post! let's see if anyone can help me out with this problem. i have a 2004 porsche cayenne turbo with 120 000 miles. took it for a high speed run last night (130+ mph). when i got home i noticed a very rough idle and the car was shaking/vibrating. i can also hear a noise from the engine similar to an exhaust leak. the check engine light was already on prior to that ride (codes are : p2187, p2189, p0011, p0441) no new codes so i assume there is no missfires? feels like it runs on 7 cylinders.. coils and spark plugs have been replaced recently can a high speed run causes a blown spark plug/coil ? i still have boost so i assume it is not a boost/vaccum leak? can it be a stuck valve, bad spring valve all of a sudden? do i need a compression test or how can i check if one cylinder is missfiring? (i speak french sorry for grammar) thanks for your help! jp
albin posted a topic in 996 Series (Carrera, Carrera 4, Carrera 4S, Targa)I have a 996 3.4l (1999) tiptronic with 140'000km. The engine was rebuild at 80'000km and the tiptronic rebuild at 100'000km. I face a strange problem since many month. I try to explain symptom in chronological order. - When it rain during the night, I need to start two time the car. The car start alway from the first power on, but no power at all. I need just to power off and re power on and the car work fine. - One month after, the car is running on 4-5 cylinder after the second power on... lot of missfire. - The garagist change all 6 spark, 6 coil, the AOS (leak problem), the MAF and the two lamda probe... Now the car run almost good except: ans this is my question. Could you help? When i drive slowly (following car) between 1'500 and 2'000 rpm (rpm important) in 3 or 4 gear (tiptronic) and I would like to speed up to overtake a car, the engine do not ramp up rpm, lot of missfire, the gear do not swith to 2 quickly and accelerate...! When i accelerate from 3'000 to 6'000 no problem the car run very well. Now, the garage tell me it is a tiptronic problem...? Could you help me on the road to find a solution ? Thanks in advance