Hesitation 1st gear @ 3k rpm
03-25-2017, 04:39 PM
#1
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Hesitation 1st gear @ 3k rpm
There's a .5-1 second hesitation when accelerating in 1st gear. Sometimes happens around 3000 rpm, sometimes 4500 rpm. Happens in normal/sport with auto start off and pcm off.
I did a search and found that some 991 owners had this problem (attributed to variocam), but I couldn't find anything re: 981 BS. Is this a software, electrical, or engine problem? Thanks.
I did a search and found that some 991 owners had this problem (attributed to variocam), but I couldn't find anything re: 981 BS. Is this a software, electrical, or engine problem? Thanks.
Last edited by mli; 03-28-2017 at 09:27 PM.
03-26-2017, 02:20 AM
#3
Post your exact model and year. I've seen discussions about some hesitation of base 981s, but that was from a dead stop. And the consensus was to not just stomp on the throttle all of a sudden, but to take maybe 1/2 a second from nothing to WOT. All vehicles with throttle-by-wire (most nowadays), don't allow the butterfly to open immediately anyway, because it'd bog down the engine. I've never had that issue because I always do that myself. From 3K rpm, your car shouldn't be doing that, but if you have PDK (you didn't mention that either), and in auto mode, it might be normal. I always drive my 2016 GTS PDK in manual mode, and zero issues. Let us know more specifics so you can get better answers
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03-26-2017, 02:18 PM
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Post your exact model and year. I've seen discussions about some hesitation of base 981s, but that was from a dead stop. And the consensus was to not just stomp on the throttle all of a sudden, but to take maybe 1/2 a second from nothing to WOT. All vehicles with throttle-by-wire (most nowadays), don't allow the butterfly to open immediately anyway, because it'd bog down the engine. I've never had that issue because I always do that myself. From 3K rpm, your car shouldn't be doing that, but if you have PDK (you didn't mention that either), and in auto mode, it might be normal. I always drive my 2016 GTS PDK in manual mode, and zero issues. Let us know more specifics so you can get better answers.
.I don't experience this problem if I mash the throttle at 2k rpm in first.
Last edited by mli; 03-26-2017 at 03:51 PM.
03-28-2017, 03:19 PM
#6
Drifting
Not these exactly symptoms, but I had a hesitation around 2500 RPM in all gears with my 981 S; took it in to Porsche and their lead tech says "they all do that." Also a common problem in 991, as mentioned. Not variocam, that's more around 3200 AFAIK.
03-28-2017, 03:55 PM
#7
Do you have exhaust valves that open at 3Krpm on that model? On my GT4 when one of the valves failed (one bank only, leading to a difference in back pressure between cylinder banks), I would get a pretty big hesitation around 3K.