Welcome to 911UK
The only place for Porsche, 911uk is the definitive enthusiast and resource site for the Porsche 911.
Registration is fast, simple and absolutely free, so join up today for full access to the site and benefit from latest member offers.

Porsche Classifieds
Porsche Buyers Guides
Sell Your Porsche on 911uk
Create a Free Classified Advert
Search Ads
Classified Adverts FAQ
Trade Classified Information
Buyer & Seller Fraud Protection
Consumer Rights Act
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Official Porsche Centre Reviews
Model
Stock
Porsche 911
991 : 2011- 21
997 : 2004- 84
996 : 1997-2005 46
993 : 1993-1998 5
964 : 1989-1993 2
Carrera 3.2 : 1983-1989 0
Carrera SC : 1977-1983 2
930 Turbo : 1975-1989 0
Early 911 : 1964-1977 3
Porsche Other Models
Classic : 1950-1965 0
Boxster : 1997- 14
Cayman : 2005- 16
Cayenne : 2003- 7
Macan : 2014- 0
Panamera : 2009- 1
912-914-924-928-944-968 1
959 - CarreraGT - RaceCar 1
Car Parts For Sale & Wanted
Other Items For Sale & Wanted
Wheels Tyres For Sale & Wanted
Number Plates For Sale Wanted

Porsche Services
Porsche Body Shop Repair
Paint Protection & Wrapping
Porsche Classic Insurance
Porsche Classic Parts
Porsche Classic Restoration
Porsche Design Collection
Porsche Engine Gearbox Rebuild
Porsche Heritage & History
Porsche News
Porsche Picture Gallery
Win a New Porsche 911

Porsche Parts
Body Parts, Body Styling
Brakes, Clearance
Electrical, Exhausts
Engine Cooling, Engine Electrical
Engine Rebuild, Heating Cooling
Interior Incar, Lighting
Rubber Seals, Service Parts
Steering, Suspension
Transmission, Workshop Tools
Early 911, 911 - 930, 928 - 968
964 - 993, 996 - 997, Boxster
Cayman, Cayenne, Panamera

Porsche Model Range
911 [991] 2011-Current
Porsche 911 [991]
911 [997] 2004-Current
Porsche 911 [997]
911 [GT] GT1-GT2-GT3
Porsche 911 [GT]
911 [996] 1997-2005
Porsche 911 [996]
911 [993] 1993-1998
Porsche 911 [993]
911 [RS] RS-RSR
Porsche 911 [RS]
911 [964] 1989-1993
Porsche 911 [964]
911 3.2 1983-1989
Porsche 911 3.2 Carrera
911 SC 1977-1983
Porsche 911 SC
911 [Early] 1964-1977
Porsche 911 [Early]
Boxster & Cayman
Porsche Boxster & Cayman
Cayenne & Panamera
Porsche Cayenne & Panamera

911uk Site Partners

Post new topic   Reply to topic
Author Message
997ant
Monza


Joined: 17 Oct 2015
Posts: 176
Location: Super Darlo


PostPosted: Tue Jul 17, 2018 6:03 pm    Post subject: My car seems to be misfiring! Help Reply with quote

As the title says,when pushing on through the gears in the higher rev range I think in 3rd and 4th the acceleration drops off,nothing else happens just a very noticeable drop in power no lights no noise,I change up and get boost again,but starts missing in the high revs.
Car still gets me home no clanking or loss of power under town driving.
The first thing I thought was coilpacks and or plugs? Or I hope this is all it could be....
Anyone had the same? Or can the mighty Demort advise please?
Many thanks in anticipation.
_________________
07 997 Turbo Manual
 
  
View user's profile Send private message
   
997ant
Monza


Joined: 17 Oct 2015
Posts: 176
Location: Super Darlo


PostPosted: Tue Jul 17, 2018 6:14 pm    Post subject: Re: My car seems to be misfiring! Help Reply with quote

997ant wrote:
As the title says,when pushing on through the gears in the higher rev range I think in 3rd and 4th the acceleration drops off,nothing else happens just a very noticeable drop in power no lights no noise,I change up and get boost again,but starts missing in the high revs.
Car still gets me home no clanking or loss of power under town driving.
The first thing I thought was coilpacks and or plugs? Or I hope this is all it could be....
Anyone had the same? Or can the mighty Demort advise please?
Many thanks in anticipation.


Can mods move this to the 997 forum please
_________________
07 997 Turbo Manual
 
  
View user's profile Send private message
   
Phil 997
Brands Hatch
Brands Hatch


Joined: 05 Dec 2015
Posts: 14429
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Tue Jul 17, 2018 6:14 pm    Post subject: Reply with quote

Maybe a solenoid on one of the banks but hopefully Iain will be along shortly as you say he will be best placed to give you an idea. Thumb
_________________
911 Owners,Some Invest In The Future,
Others Enjoy The Moment Today.
 
  
View user's profile Send private message
   
997ant
Monza


Joined: 17 Oct 2015
Posts: 176
Location: Super Darlo


PostPosted: Tue Jul 17, 2018 6:15 pm    Post subject: Reply with quote

Cheers phil
_________________
07 997 Turbo Manual
 
  
View user's profile Send private message
   
Porschekit
Imola


Joined: 12 Aug 2014
Posts: 821
Location: North East UK


PostPosted: Tue Jul 17, 2018 6:40 pm    Post subject: Reply with quote

Ant.....you're not using it enough..... nooo get yourself out with the boys on the next run.... Grin
_________________
997.1 C4S Meteor Grey Metalic
 
  
View user's profile Send private message
   
997ant
Monza


Joined: 17 Oct 2015
Posts: 176
Location: Super Darlo


PostPosted: Tue Jul 17, 2018 6:56 pm    Post subject: Reply with quote

Lol,if I knew what I was doing from one day to the next I'd be out John.
_________________
07 997 Turbo Manual
 
  
View user's profile Send private message
   
deMort
Zolder


Joined: 21 Mar 2015
Posts: 5342
Location: Brighton


PostPosted: Tue Jul 17, 2018 7:26 pm    Post subject: Reply with quote

Well .. hmm ..

Ok so a misfire tends to be more noticable just above idle .. a general lumpyness .

The car will monitor for a misfire .. save the planet stuff and generate a fault code and an eml pretty quickly .

Misfires are less noticable at higher rpm and you dont have an eml so im not convinced atm ..

Higher rpm so we are into turbo boost , thats a possible factor .. maf sensors again higher rpm but not max throttle could be an issue.

What would i do though .. it would have to start with a tester and any fault codes , then onto actual values with maf readings being one i would map .. misfires can be seen on a tester as can low power on any cyl so i would be checking that .

low ish fuel pressure is another .. fine on normal driveing but at high rpm you need a good fuel flow .. pumps can be a bit flakey and ive seen this on here as well as at work with low fuel delivery at high rpm.

In short im afraid there is no one thing that springs out to me as the fault .. theres a lot i would test but its a garage or a tester and check readings to find the fault i feel .
_________________
Mechanic

7pm - 9pm
At an Indy these days !
 
  
View user's profile Send private message
   
997ant
Monza


Joined: 17 Oct 2015
Posts: 176
Location: Super Darlo


PostPosted: Tue Jul 17, 2018 7:46 pm    Post subject: Reply with quote

Thanks for the reply Demort, so not an obvious problem, I will have to get it in for an inspection when I get chance.

Would it make a more of a difference if it happened whilst in sport mode? I will take it out and try both to see if it makes any difference and post my findings.thanks again.
_________________
07 997 Turbo Manual
 
  
View user's profile Send private message
   
Display posts from previous:   
Post new topic   Reply to topic   All times are GMT - 12 Hours
Page 1 of 1

 
Jump to:  

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum