Intermittent Misfire

JayG
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Re: Intermittent Misfire

Post by JayG » Tue Jul 19, 2022 7:33 am

UPDATE

Started having the P305 code again

I scanned with my durametric and now see P1371 Valve lift control check sum and P1364 valve lift control Cyl 5

any ideas on fixing?

If I drive it am I in danger of an engine failure?
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY (sold)
2004 996 Targa Tip
2020 BMW X3 Xdrive, 2004 F-150 "Big Red"

theprf
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Re: Intermittent Misfire

Post by theprf » Tue Jul 19, 2022 8:22 am

You may have a bad lifter on that cylinder, they get stuck at high lift which causes misfires.

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02TX996Cab
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Re: Intermittent Misfire

Post by 02TX996Cab » Tue Jul 19, 2022 8:27 am

A quick Google search on your new error codes returned the thread below from Rennlist (damnit):

https://rennlist.com/forums/996-forum/1 ... e-5-a.html

Sticking lifter seems to be a possibility, as theprf suggested above. Were I in your situation I'd drive the car to a shop you trust (sooner rather than later) who has a PIWIS where they can do some detailed diagnoses. If a lifter is indeed sticking it can be replaced with the engine still in the car or there's the shadetree mechanic routine described in the Rennlist (damnit) thread that's referenced from the one I've linked above.

Good luck!
Proud owner of a Flat6-powered 2002 996 Cab, 2016 GT4, 2019 Ford F-150 "Country Cadillac", and 2005 Ford Focus (not so hot hatch) daily driver. And a Wright ZTO 52" to keep several acres of grass-like substance neat and tidy!

JayG
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UPDATE-Re: Intermittent Misfire

Post by JayG » Thu Mar 23, 2023 9:59 am

My Targa ended up needing 2 intake lifters replaced. Could have been a lot worse

I found a really good shop that pretty much only does Porsche repair. Its been around over 30 years. They have 2 of their techs that really know M-96 engines. Even the office manager knows Porsche. Unlike many shops, they have real Porsche diagnostic tools, several versions of PIWIS. When I spoke with them and explained the codes and symptoms I was getting, they knew exactly what the likely problem was and they were spot on. I guess it helps when you really know the car

All in all it was just under $2k including an oil change and programming a new key for me. I think I got off easy.

I can't really complain, in the 8 years I have had the Targa, other than tires, oil and brakes, I have not had to really put any $$$ into the car. A few niggles here and there, maybe total $200 and a pair of window regulators that I installed.

Now I can start driver her again
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY (sold)
2004 996 Targa Tip
2020 BMW X3 Xdrive, 2004 F-150 "Big Red"

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32wildbilly
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Re: UPDATE-Re: Intermittent Misfire

Post by 32wildbilly » Thu Mar 23, 2023 11:33 am

JayG wrote: Thu Mar 23, 2023 9:59 am My Targa ended up needing 2 intake lifters replaced. Could have been a lot worse

I found a really good shop that pretty much only does Porsche repair. Its been around over 30 years. They have 2 of their techs that really know M-96 engines. Even the office manager knows Porsche. Unlike many shops, they have real Porsche diagnostic tools, several versions of PIWIS. When I spoke with them and explained the codes and symptoms I was getting, they knew exactly what the likely problem was and they were spot on. I guess it helps when you really know the car

All in all it was just under $2k including an oil change and programming a new key for me. I think I got off easy.

I can't really complain, in the 8 years I have had the Targa, other than tires, oil and brakes, I have not had to really put any $$$ into the car. A few niggles here and there, maybe total $200 and a pair of window regulators that I installed.

Now I can start driver her again
Yeah that isn't bad at all. Glad you got it straightened out.

My misfire turned out to be much more expensive...
57343209621__7FB55920-F399-4D35-8D86-0D5835C273E7.jpeg
57343209621__7FB55920-F399-4D35-8D86-0D5835C273E7.jpeg (169.71 KiB) Viewed 676 times
Never gonna make you cry...

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FRUNKenstein
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Re: UPDATE-Re: Intermittent Misfire

Post by FRUNKenstein » Mon Apr 03, 2023 10:00 am

JayG wrote: Thu Mar 23, 2023 9:59 am
All in all it was just under $2k including an oil change and programming a new key for me. I think I got off easy.
Johnny Irish spent that on an oil change.
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Current:
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1987 928S4, Guards Red
1987 951, Guards Red
1973 914 2.0 Bahia Red

2006 955S, Lapis Blue
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Gone but not forgotten: 1975 914 2.0, Laguna Blue; 1999 996 C4 Aerokit Black; 1990 964 C2 Guards Red; 2006 955S Arctic Silver

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5chn3ll
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Re: Intermittent Misfire

Post by 5chn3ll » Mon Apr 03, 2023 11:52 am

Well, an oil change and a pair of bespoke woolen driving socks made of thread hand-spun on the clam-chowder-white thighs of German virgins.

Understeer: You will hit the wall with the front end.
Oversteer: You will hit the wall with the rear end.
Horsepower: How hard you will hit the wall.
Torque: How far you will move the wall.

Gone hunting with Alec Baldwin and Dick Cheney. Back soon.

JayG
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Re: Intermittent Misfire

Post by JayG » Tue Apr 25, 2023 6:00 am

5chn3ll wrote: Mon Apr 03, 2023 11:52 am Well, an oil change and a pair of bespoke woolen driving socks made of thread hand-spun on the clam-chowder-white thighs of German virgins.
where can I get a pair of those socks
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY (sold)
2004 996 Targa Tip
2020 BMW X3 Xdrive, 2004 F-150 "Big Red"

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5chn3ll
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Re: Intermittent Misfire

Post by 5chn3ll » Tue Apr 25, 2023 8:40 am

I believe you can email johnny.irish@imatwat.com

Understeer: You will hit the wall with the front end.
Oversteer: You will hit the wall with the rear end.
Horsepower: How hard you will hit the wall.
Torque: How far you will move the wall.

Gone hunting with Alec Baldwin and Dick Cheney. Back soon.

JayG
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Re: Intermittent Misfire

Post by JayG » Wed Apr 26, 2023 7:49 am

5chn3ll wrote: Tue Apr 25, 2023 8:40 am I believe you can email johnny.irish@imatwat.com
I thought it was johnny.irish@imaidiot.com
2004 Boxster S 6 speed - DRL relay hack, Polaris AutoTop DIY (sold)
2004 996 Targa Tip
2020 BMW X3 Xdrive, 2004 F-150 "Big Red"

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