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
Pre Purchase Inspection (PPI)
Porsche Car Sourcing
Porsche Cars Wanted
Model
Stock
Porsche 911
991 : 2011- 8
997 : 2004- 71
996 : 1997-2005 44
993 : 1993-1998 10
964 : 1989-1993 5
Carrera 3.2 : 1983-1989 1
Carrera SC : 1977-1983 0
930 Turbo : 1975-1989 0
Early 911 : 1964-1977 2
Porsche Other Models
Classic : 1950-1965 1
Boxster : 1997- 14
Cayman : 2005- 13
Cayenne : 2003- 10
Macan : 2014- 2
Panamera : 2009- 3
912-914-924-928-944-968 4
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 & Body 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
gerryfrost
Newbie


Joined: 04 Jan 2015
Posts: 9
Location: St. Albans, Herts.


PostPosted: Sun Dec 03, 2017 2:25 pm    Post subject: 997.2 misfire problem code P0204 Reply with quote

Hi There. Any help or assistance with my issue will be much appreciated…..997.2 2010 with 38k on the clock.
All running fine. Not used for 3 weeks then went on 100 mile drive. 99 miles of the drive fine and driven fairly leisurely (M25!) and on last mile of trip, put my foot down a bit and then MIL light came on.
Checked with a generic OBD11 reader and got the following codes:
P0204 injector circuit malfunction – cylinder 4
P0270 cylinder 4 injector – circuit low
P0304 cylinder 4 - Misfire detected

So, seems like an injector fault or wiring fault. Thinking it might be ignition problem to that cylinder and knowing coil packs can be an issue, I have swopped spark plug and coil packs over from another cylinder – no change.
Being cylinder 4, it is the easiest to see the injector, so I have check the resistance and it shows 1.4 Ohms (seems low but not a short) and connected (tapped) a 12v signal to it and you can hear the injector opening/clicking.
I have tried tapping the injector with a metal rod to try and free any deposits (but scared to knock it too hard!)
In my mind, it seems like dirt or a dirty injector but I am fairly mechanically minded (changing plugs and coil packs on a 997 isn’t that easy as you know…) but I am really not confident about trying to remove the injector as it looks like a bit of a nightmare.
Any suggestions from anyone before I have to try and replace the injector? (or get someone else to do it for me)
I know I can swop the injectors over to see if the fault moves but the amount of work involved tells me to just replace the injector while I am there. Porsche quote £179.15 for the part 9A1 110 129 10. I am sure I can find the Bosch or whatever OEM part for less if I search……
It is clearly running on only 5 cylinders and I have tried to ‘blast it - Italian tune up’ to clear the problem but no change – and don’t really want to drive it more with the problem. I have reset the codes but it comes on straight away when started again and runs lumpy from startup.
Being 38k miles, a few friends told me it is VERY unlikely to be an injector but I cannot see it can be anything else? Was thinking of buying some archoil cleaner (or similar) but think that might not cure the problem if it is a faulty injector rather than just dirt/deposits in the injector……..and if the injector is not injecting fuel, how will cleaner ‘clean it’ ?
Any suggestions from anyone before I have to try and replace the injector? It looks like a big job! (or get someone else to do it for me) or will a higher spec OBD reader give me more information – is it worth getting an indie to run it up on a ‘proper’ reader or just a waste of time?
Thanks in advance. Smile

Last edited by gerryfrost on Mon Dec 04, 2017 5:54 pm; edited 1 time in total
 
  
View user's profile Send private message
   
996ttalot
Approved Trader


Joined: 21 Sep 2009
Posts: 1313
Location: Horley Gatwick


PostPosted: Sun Dec 03, 2017 2:45 pm    Post subject: Reply with quote

On the DFI it is a common issue for an injector to fail - they are under in some cases 150psi unlike the non Dfi which have a lot less pressure.

The recommendation is to replace all injectors on that bank which I disagree with porsche about since I have asked the question about flow matching and they cannot give an answer - surprise surprise - as if I buy 3 injectors all three will be matched - not !

With plugging in PIWIS and since you have done wiring checks the it is most likely that replacing that one injector will resolve.

However I have seen this done and then months later same issue come back - excessive fuel pressure can be a cause of this.

So yes it is probably worth a try to replace just the one.

Ken
_________________
nineexcellence.com
Tel: 01293 226911. Follow us on Facebook www.facebook.com/Nineexcellence
SALES, SERVICE, UPGRADES
 
  
View user's profile Send private message Send e-mail Visit poster's website
   
Stuttgartflyer
Trainee


Joined: 12 Nov 2016
Posts: 57
Location: Salisbury


PostPosted: Sun Dec 03, 2017 3:49 pm    Post subject: Reply with quote

Hi Gerry,
I had a similar issue although we could never get a fault to log, after changing coil packs and plugs the injectors and fuel pump were tested and all passed... after much frustration we did live data logging and found that sporadically i was getting a miss on no.4 when under load, turns out the wire going to the coil pack had chafed and was earthing occasionally when under heavy load.
Not sure if this will help but may be worth a good poke around.
Good Luck
_________________
Atlas Grey - 997.2 C4S
 
  
View user's profile Send private message
   
gerryfrost
Newbie


Joined: 04 Jan 2015
Posts: 9
Location: St. Albans, Herts.


PostPosted: Mon Dec 04, 2017 6:02 pm    Post subject: Reply with quote

Thanks for your help. Used a Noid light today and got a reading to the input of the injector - noid light was flashing away as it should do.....
I read the voltage to the injector and it was showing 3.6volts; i was expecting to see 12v signal to the injector or was the info i was given not correct?
(it is a 997.2 not a gen 1)
Thanks again and any help is appreciated.
 
  
View user's profile Send private message
   
Demort
Estoril


Joined: 21 Mar 2015
Posts: 3502
Location: Sussex


PostPosted: Tue Dec 05, 2017 3:53 pm    Post subject: Reply with quote

Perhaps this will help ..
_________________
Mechanic

7pm - 9pm
 



injector-1.jpg
 Description:
 Filesize:  410.65 KB
 Viewed:  483 Time(s)

injector-1.jpg


  
View user's profile Send private message
   
gerryfrost
Newbie


Joined: 04 Jan 2015
Posts: 9
Location: St. Albans, Herts.


PostPosted: Wed Dec 06, 2017 6:59 pm    Post subject: Reply with quote

Thanks for your help.
Don’t suppose anyone knows the OEM product for these injectors? Normally they are found in a search but can’t find anything....continental or bosch and what part number?
 
  
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 can attach files in this forum
You can download files in this forum
You cannot post calendar events in this forum