996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Misfire during hard turns?

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Old Feb 28, 2015 | 10:26 AM
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Originally Posted by spmorgan
My (new to me) Turbo feels like it is misfiring during normal driving, and has thrown a CEL

Shawn
So get the codes read..(take Mark's suggestion)...or we can play land of a thousand guesses and spend your money rapidly
 
Old Mar 1, 2015 | 10:12 AM
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The codes were secondary air injection codes. The shop thought the cause of those were a vacuum leak, unfortunately, got the car back yesterday and the CEL is back on again.

New tires are on the way to see about fixing the PSM (and when PSM is off, it seems ABS is kicking in early as well) issue.

Originally Posted by wross996TT
So get the codes read..(take Mark's suggestion)...or we can play land of a thousand guesses and spend your money rapidly
 

Last edited by spmorgan; Mar 1, 2015 at 10:16 AM.
Old Mar 1, 2015 | 12:57 PM
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I'm hopeful a correct sized set of tires will solve this for you, it certainly sounds like the solution based on your description of the issue and the condition of the tires. Fingers crossed!
 
Old Mar 2, 2015 | 04:35 AM
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Originally Posted by spmorgan
The codes were secondary air injection codes. The shop thought the cause of those were a vacuum leak, unfortunately, got the car back yesterday and the CEL is back on again.

New tires are on the way to see about fixing the PSM (and when PSM is off, it seems ABS is kicking in early as well) issue.
What were the code numbers? So, I assume the shop did a leak test, right???
 
Old Mar 2, 2015 | 06:28 AM
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Originally Posted by spmorgan
The codes were secondary air injection codes. The shop thought the cause of those were a vacuum leak, unfortunately, got the car back yesterday and the CEL is back on again.

New tires are on the way to see about fixing the PSM (and when PSM is off, it seems ABS is kicking in early as well) issue.
as ive noted upthreand and others seem to concur: as far as tires and abs/psm cels. the car running awd is very sensitive to mismatched tires and/or tread depths. e.g. new vs old. get rid of that setup asap

that is ordinarily the FIRST place to eliminate as the cause, as it is normal, and most all of experimenting with tires have had some form of it.

do that first IF tires are mismatched in either tire tread depth/make, or both. as thats an instant recipe for cels on hard turns. gl.
 
Old Mar 3, 2015 | 04:54 PM
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Originally Posted by spmorgan
My (new to me) Turbo feels like it is misfiring during normal driving, and has thrown a CEL, so I have been mostly babying it until I can get it into the shop this week...however, I noticed today that it seems to "misfire" or lose power much more prominently under semi-aggressive turning. Anyone ever heard of anything like this? Want to make sure I have some ideas when going In for service... Shawn
Pop the engine lid and follow the O2 sensor wires and look for a loose wire chaffing. They are supposed to clip into metal clips to secure them. But sometimes they come loose and hit either the engine, heat shields or the other pieces and chafe.
 
Old Mar 8, 2015 | 06:58 PM
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As an update, the issue was fixed by replacing the front tires with matching Nitto's. I'm very surprised by this, frankly, but lesson learned...all 4 tires need to be changed together!
 
Old Mar 8, 2015 | 09:07 PM
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Originally Posted by spmorgan
As an update, the issue was fixed by replacing the front tires with matching Nitto's. I'm very surprised by this, frankly, but lesson learned...all 4 tires need to be changed together!
as others also told ya so cool you got it sorted
 
Old Mar 8, 2015 | 10:16 PM
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Old Mar 8, 2015 | 11:27 PM
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Makes sense, PSM and abs use wheel speed data to determine when to trigger, PSM in particular look at speed differences of all the wheels. Exceed that range and it can trigger, when you turn outside where's turn faster than inner and pushed you over the edge it seems. Glad it's fixed and that it was something useful like new tires
 
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