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ichiban
 
Join Date: Nov 2010
Posts: 5
Unhappy Misfire cyclinder #6

2000 Porsche 996
120K miles
6 spd



I need some help figuring this one out. At idle and normal daily driving I do not have not have any issues but when I down shift and have it WOT I get a cylinder #6 misfire when I reach 5K RPM. Here is a little more information:

misfire only in #6 at about 5 or 5.5K for the past 6 months
New coils 1.5 years ago
Changed Spark plugs over the weekends and inspected coils for cracks
they were not any cracks in the coils
the spark plugs showed normal wear

Durametric codes: I cleared the codes and this is the only codes that keep popping up

P0300
Porsche fault code 507 - Misfire detection (total)
P0306
Porsche fault code 509 - Misfire cylinder 6


Last edited by wesley_817; 03-18-2013 at 08:21 AM..
Old 03-18-2013, 08:19 AM
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one of gods prototypes
 
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Could be happening due to a vacuum leak....what are the adaption numbers doing?
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Old 03-18-2013, 06:50 PM
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Switch the coil pack to a different cylinder. Could be the CP has an internal electrical issue.
Old 03-18-2013, 08:38 PM
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lifter? #6 is the cylinder that the lifter sometimes fails
Old 03-19-2013, 07:11 AM
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9 times out of 10, it's a coil pack.
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Old 03-25-2013, 08:29 PM
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ichiban
 
Join Date: Nov 2010
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ok guys sorry for the late response.. but here is what I have done but still get the same code.

1. changed the spark plug
2. switched around the coil packs
3. ran some techron in the gas




1) What I have noticed is that once I get the check engine light my car idles and drives rough. If I run my durametric while the car is idling rough and clear the code then the idle immediately smooths out.

2) I have also noticed that the exhaust originating from the passenger side is not as strong as the opposite side. (maybe time for a new cat)

3) Also I started to hear the fuel purge from the gas tank when I turn off the engine
Old 04-01-2013, 02:13 PM
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ichiban
 
Join Date: Nov 2010
Posts: 5
Quote:
Originally Posted by bell View Post
Could be happening due to a vacuum leak....what are the adaption numbers doing?

Tomorrow I will check the:

- Adaptation value, area 2, cylinders 1 - 3 (FRA)
- Adaptation value, area 2, cylinders 4 - 6 (FRA2)
- Adaptation value, area I, cylinders 1 - 3 (TRA)
- Adaptation value, area I, cylinders 4 - 6 (TRA2)



does anyone know the normal value ranges for these?

Old 04-01-2013, 06:12 PM
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