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Join Date: Feb 2005
Location: S.W. CT
Posts: 191
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996 40AE P0300 1-6 Code help

Hello Gents. I have been tracing a continuous PO300 fault code for a couple of months now... Backstory.... new car to me, PPI-Lite gave me the misfire codes but when I inspected the car, the coils were cracked so I assumed that was the cause. I replaced all the coils and plugs (correct part numbers) and within a few weeks the CEL light came back on.

I then purchased a Durmetric started trying to trace the codes... the misfires appear to happen during start-up and just off idle. I get an occasional stutter if I pull from a stop in first gear with revs below 1200rpms.

I've run 3 cans of Seaform, cleaned the throtte body and MAF and everything is functioning (from what I can tell from the Actuals reports from the Durametric). I'm not pro and am just becoming acquainted with the 996 and I hate the idea of not being able to fix this without going to my independent.

Could I ask someone with more experience reviewing the actuals to comment on the misfire patterns in the attached reports and let me know if they have any idea of what I should be checking next?

The engine pulls strong and is smooth. The idle is pretty steady when cold (1100-1175rpm) drops down to 700-800rpm) when warmed up. Not oil burn, cross contamination in the coolant or oil tube. The cam variation looks on spec in the reports... I just don't know what to look at next.

Thank you in advance... PS this is cross-posted on Renntech as well and have been getting lots of help there but I'm getting to a dead end. Hoped someone here might have a good idea.

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04 996 AE (daily driver)
08 A3 Quattro
05 E500 Wagon
PO: 11 Raptor SCREW, 11 GTI 6sp mt, 01 Audi S4 Avanti, 95 Volvo 855 T5R, 82 911SC
Old 07-24-2017, 11:23 AM
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This site doesn't allow me to upload files other than images so I created a public drop box where you can access the Fault Codes in PDF and the Actual Values in different text parameters across multiple date and start up conditions.

http://https://www.dropbox.com/sh/2ddt13qttiqr971/AACJFJkmnE0YM_Z6VEODnnGla?dl=0
__________________
04 996 AE (daily driver)
08 A3 Quattro
05 E500 Wagon
PO: 11 Raptor SCREW, 11 GTI 6sp mt, 01 Audi S4 Avanti, 95 Volvo 855 T5R, 82 911SC
Old 07-24-2017, 12:11 PM
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Location: S.W. CT
Posts: 191
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http://www.dropbox.com/sh/2ddt13qttiqr971/AACJFJkmnE0YM_Z6VEODnnGla?dl=0

If the above does not work maybe this one will.
__________________
04 996 AE (daily driver)
08 A3 Quattro
05 E500 Wagon
PO: 11 Raptor SCREW, 11 GTI 6sp mt, 01 Audi S4 Avanti, 95 Volvo 855 T5R, 82 911SC
Old 07-24-2017, 12:12 PM
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Join Date: Dec 2015
Location: Chicago area
Posts: 24
Innov8, there is a member with the very same car having the same type of problem

https://rennlist.com/forums/996-forum/979446-nor-indy-or-dealership-could-fix-it-i-need-you-guys-help.html

a lot of are suspecting it's in the ECU

Old 07-31-2017, 06:54 AM
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diremetic codes , misfires


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